Vibes �

Lab.Client/pom.xml

@@ -0,0 +1,95 @@
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>me.zinch</groupId>
+    <artifactId>Lab6-Client</artifactId>
+    <version>1.0</version>
+    <packaging>jar</packaging>
+
+    <name>Lab6-Client</name>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <maven.compiler.target>17</maven.compiler.target>
+        <maven.compiler.source>17</maven.compiler.source>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.fasterxml.jackson.dataformat</groupId>
+            <artifactId>jackson-dataformat-xml</artifactId>
+            <version>2.15.0</version>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.datatype</groupId>
+            <artifactId>jackson-datatype-jsr310</artifactId>
+            <version>2.17.0</version>
+        </dependency>
+        <dependency>
+            <groupId>org.hibernate.validator</groupId>
+            <artifactId>hibernate-validator</artifactId>
+            <version>8.0.1.Final</version>
+        </dependency>
+        <dependency>
+            <groupId>org.glassfish</groupId>
+            <artifactId>jakarta.el</artifactId>
+            <version>5.0.0-M1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-core</artifactId>
+            <version>2.23.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+            <version>2.0.12</version>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-log4j12</artifactId>
+            <version>2.0.12</version>
+        </dependency>
+        <dependency>
+            <groupId>me.zinch</groupId>
+            <artifactId>Lab6-Domain</artifactId>
+            <version>1.0-SNAPSHOT</version>
+            <scope>compile</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <artifactId>maven-assembly-plugin</artifactId>
+                <groupId>org.apache.maven.plugins</groupId>
+                <version>3.7.1</version>
+                <configuration>
+                    <archive>
+                        <manifest>
+                            <mainClass>me.zinch.Lab6.Client.App</mainClass>
+                        </manifest>
+                    </archive>
+                    <descriptorRefs>
+                        <descriptorRef>jar-with-dependencies</descriptorRef>
+                    </descriptorRefs>
+                </configuration>
+                <executions>
+                    <execution>
+                        <id>make-assembly</id>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>single</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-javadoc-plugin</artifactId>
+                <version>3.6.3</version>
+            </plugin>
+        </plugins>
+    </build>
+</project>

Lab.Client/src/main/java/me/zinch/Lab6/Client/App.java

@@ -0,0 +1,14 @@
+package me.zinch.Lab6.Client;
+
+import me.zinch.Lab6.Client.console.Console;
+import me.zinch.Lab6.Client.console.ShutdownHook;
+
+/**
+ * Main class for running the application.
+ */
+public class App {
+  public static void main(String[] args) {
+    Runtime.getRuntime().addShutdownHook(new ShutdownHook());
+    Console.run();
+  }
+}

Lab.Client/src/main/java/me/zinch/Lab6/Client/client/Client.java

@@ -0,0 +1,84 @@
+package me.zinch.Lab6.Client.client;
+
+import me.zinch.Lab6.Client.console.Console;
+import me.zinch.Lab6.Client.exceptions.ConnectionErrorException;
+import me.zinch.Lab6.Client.exceptions.ResponseException;
+import me.zinch.Lab6.Domain.dto.BodylessMessage;
+import me.zinch.Lab6.Domain.dto.Message;
+import me.zinch.Lab6.Domain.dto.MessageType;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.BufferedOutputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.net.ConnectException;
+import java.net.Socket;
+import java.net.SocketTimeoutException;
+import java.util.concurrent.TimeUnit;
+
+public class Client {
+    private static final Logger log = LoggerFactory.getLogger(Client.class);
+    private static final int MAX_RETRIES = 3;
+    private static final int RETRY_DELAY_MS = 1000;
+    private static final int SOCKET_TIMEOUT_MS = 5000;
+    
+    private final String address;
+    private final int port;
+
+    public Client(String address, int port) throws ConnectionErrorException, ResponseException {
+        this.address = address;
+        this.port = port;
+
+        try {
+            if (sendMessage(new BodylessMessage(MessageType.HELLO)).getType() == MessageType.HELLO) {
+                Console.log(String.format("Connected to server %s:%s", address, port));
+            }
+        } catch (IOException | ClassNotFoundException e) {
+            throw new ResponseException();
+        }
+    }
+
+    public Message sendMessage(Message message) throws ClassNotFoundException, IOException {
+        int retries = 0;
+        while (true) {
+            try {
+                return trySendMessage(message);
+            } catch (ConnectException | SocketTimeoutException e) {
+                if (++retries > MAX_RETRIES) {
+                    throw new IOException("Server is unavailable after " + MAX_RETRIES + " retries");
+                }
+                log.warn("Connection failed, retrying in {} ms... ({}/{})", 
+                    RETRY_DELAY_MS, retries, MAX_RETRIES);
+                try {
+                    TimeUnit.MILLISECONDS.sleep(RETRY_DELAY_MS);
+                } catch (InterruptedException ie) {
+                    Thread.currentThread().interrupt();
+                    throw new IOException("Interrupted while waiting to retry");
+                }
+            }
+        }
+    }
+
+    private Message trySendMessage(Message message) throws IOException, ClassNotFoundException {
+        try (var socket = new Socket(address, port)) {
+            socket.setSoTimeout(SOCKET_TIMEOUT_MS);
+            
+            try (var bufferedSocketOutputStream = new BufferedOutputStream(socket.getOutputStream());
+                 var byteArrayOutputStream = new ByteArrayOutputStream();
+                 var objectOutputStream = new ObjectOutputStream(byteArrayOutputStream)) {
+
+                objectOutputStream.writeObject(message);
+                objectOutputStream.flush();
+                bufferedSocketOutputStream.write(byteArrayOutputStream.toByteArray());
+                bufferedSocketOutputStream.flush();
+
+                try (var objectInputStream = new ObjectInputStream(socket.getInputStream())) {
+                    return (Message) objectInputStream.readObject();
+                }
+            }
+        }
+    }
+}

Lab.Client/src/main/java/me/zinch/Lab6/Client/commands/Add.java

@@ -0,0 +1,33 @@
+package me.zinch.Lab6.Client.commands;
+
+import me.zinch.Lab6.Client.client.Client;
+import me.zinch.Lab6.Client.console.Console;
+import me.zinch.Lab6.Client.exceptions.CommandActionException;
+import me.zinch.Lab6.Domain.dto.BodyfulMessage;
+import me.zinch.Lab6.Domain.dto.BodylessMessage;
+import me.zinch.Lab6.Domain.dto.MessageType;
+
+import java.io.IOException;
+import java.util.regex.Pattern;
+
+/**
+ * The Add class represents a command to add a new element to a collection.
+ * It extends the Command class.
+ */
+public class Add extends Command {
+  public Add() {
+    super("add {element}", "добавить новый элемент в коллекцию", Pattern.compile("^add"));
+  }
+
+  @Override
+  public String action(Client client) throws CommandActionException {
+    try {
+      var productDTO = Console.readProductDTO();
+      var request = new BodyfulMessage(MessageType.POST, Console.getLastCommand(), productDTO);
+      var response = (BodylessMessage) client.sendMessage(request);
+      return response.getBody().toString();
+    } catch (IOException | ClassNotFoundException e) {
+      throw new CommandActionException(e);
+    }
+  }
+}

Lab.Client/src/main/java/me/zinch/Lab6/Client/commands/Clear.java

@@ -0,0 +1,11 @@
+package me.zinch.Lab6.Client.commands;
+
+/**
+ * The Clear class represents a command to clear a collection.
+ * It extends the Command class.
+ */
+public class Clear extends Command {
+  public Clear() {
+    super("clear", "очистить коллекцию");
+  }
+}

Lab.Client/src/main/java/me/zinch/Lab6/Client/commands/Command.java

@@ -0,0 +1,59 @@
+package me.zinch.Lab6.Client.commands;
+
+import me.zinch.Lab6.Client.client.Client;
+import me.zinch.Lab6.Client.exceptions.CommandActionException;
+import me.zinch.Lab6.Domain.dto.BodylessMessage;
+import me.zinch.Lab6.Domain.dto.MessageType;
+
+import java.io.IOException;
+import java.util.regex.Pattern;
+
+/**
+ * Represents a command that can be executed.
+ */
+public abstract class Command {
+  private final String name;
+  private final String description;
+  private final Pattern pattern;
+
+  public Command(String name, String description, Pattern pattern) {
+    this.name = name;
+    this.description = description;
+    this.pattern = pattern;
+  }
+
+  public Command(String name, String description) {
+    this.name = name;
+    this.description = description;
+    this.pattern = Pattern.compile("^" + name);
+  }
+
+  public final String getName() {
+    return name;
+  }
+
+  public final String getSignature() {
+    return name.split(" ")[0];
+  }
+
+  public final String getDescription() {
+    return description;
+  }
+
+  public final Pattern getPattern() {
+    return pattern;
+  }
+
+  public final boolean checkPattern(String input) {
+    return pattern.matcher(input).matches();
+  }
+
+  public String action(Client client) throws CommandActionException {
+    try {
+      var response = (BodylessMessage) client.sendMessage(new BodylessMessage(MessageType.GET, this.getName()));
+      return response.getBody().toString();
+    } catch (IOException | ClassNotFoundException e) {
+      throw new CommandActionException(e);
+    }
+  }
+}

Lab.Client/src/main/java/me/zinch/Lab6/Client/commands/CommandManager.java

@@ -0,0 +1,47 @@
+package me.zinch.Lab6.Client.commands;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+
+/**
+ * Manages the registration and retrieval of commands.
+ */
+public class CommandManager {
+  private static final List<Command> commandList = new ArrayList<>();
+
+  static {
+    registerCommand(new Help());
+    registerCommand(new Info());
+    registerCommand(new Show());
+    registerCommand(new Add());
+    registerCommand(new Update());
+    registerCommand(new Remove());
+    registerCommand(new Clear());
+    registerCommand(new ExecuteScript());
+    registerCommand(new Exit());
+    registerCommand(new Head());
+    registerCommand(new RemoveHead());
+    registerCommand(new History());
+    registerCommand(new MaxByWeight());
+    registerCommand(new GroupCountingByType());
+    registerCommand(new FilterLessThanCharacter());
+  }
+
+  public static void registerCommand(Command command) {
+    commandList.add(command);
+  }
+
+  public static String getRegisteredCommand() {
+    return String.join("\n", commandList
+            .stream()
+            .map(command -> String.format("%s - %s", command.getName(), command.getDescription()))
+            .toList());
+  }
+
+  public static Optional<Command> getCommandByInput(String input) {
+    return commandList.stream()
+        .filter(command -> command.checkPattern(input))
+        .findFirst();
+  }
+}

Lab.Client/src/main/java/me/zinch/Lab6/Client/commands/ExecuteScript.java

@@ -1,8 +1,8 @@
-package me.zinch.commands;
+package me.zinch.Lab6.Client.commands;
 
-import me.zinch.console.Console;
-import me.zinch.files.ScriptLoader;
-import me.zinch.wrapper.ProductCollection;
+import me.zinch.Lab6.Client.client.Client;
+import me.zinch.Lab6.Client.console.Console;
+import me.zinch.Lab6.Client.files.ScriptLoader;
 
 import java.io.IOException;
 import java.util.ArrayList;
@@ -15,6 +15,10 @@ import java.util.regex.Pattern;
 public class ExecuteScript extends Command {
   private static final List<String> executeStack = new ArrayList<>();
 
+  public ExecuteScript() {
+    super("execute_script file_name", "считать и исполнить скрипт из указанного файла. В скрипте содержатся команды в таком же виде, в котором их вводит пользователь в интерактивном режиме", Pattern.compile("^execute_script .+"));
+  }
+
   private void addFileToStack(String filePath) {
     executeStack.add(filePath);
   }
@@ -27,17 +31,15 @@ public class ExecuteScript extends Command {
     return executeStack.contains(filePath);
   }
 
-  public ExecuteScript() {
-    super("execute_script file_name", "считать и исполнить скрипт из указанного файла. В скрипте содержатся команды в таком же виде, в котором их вводит пользователь в интерактивном режиме", Pattern.compile("^execute_script .+"));
-  }
-
   @Override
-  public String action(ProductCollection productCollection) {
+  public String action(Client client) {
     try {
+      var result = new StringBuilder();
       var scriptFile = Console.getLastCommand().split(" ")[1];
+      result.append(String.format("Скрипт %s начинает работу.", scriptFile)).append("\n");
       addFileToStack(scriptFile);
       var commandList = ScriptLoader.loadList(scriptFile);
-      for (var input: commandList) {
+      for (var input : commandList) {
         input = input.trim();
         var command = CommandManager.getCommandByInput(input);
         if (command.isPresent()) {
@@ -47,13 +49,14 @@ public class ExecuteScript extends Command {
             if (checkFileInStack(nextFile)) continue;
             addFileToStack(nextFile);
           }
-          command.get().action(productCollection);
+          result.append(command.get().action(client)).append("\n");
         } else {
-          new UnknownCommand().action(productCollection);
+          new UnknownCommand().action(client);
         }
       }
       clearStack();
-      return String.format("Скрипт %s завершил работу.%n", scriptFile);
+      result.append(String.format("Скрипт %s завершил работу.", scriptFile)).append("\n");
+      return result.toString();
     } catch (IOException e) {
       return e.getMessage();
     }

Lab.Client/src/main/java/me/zinch/Lab6/Client/commands/Exit.java

@@ -1,7 +1,7 @@
-package me.zinch.commands;
+package me.zinch.Lab6.Client.commands;
 
-import me.zinch.console.Console;
-import me.zinch.wrapper.ProductCollection;
+import me.zinch.Lab6.Client.client.Client;
+import me.zinch.Lab6.Client.console.Console;
 
 /**
  * A command to exit the program without saving to a file.
@@ -12,8 +12,8 @@ public class Exit extends Command {
   }
 
   @Override
-  public String action(ProductCollection productCollection) {
-    Console.stopApp();
+  public String action(Client client) {
+    Console.stopAppWithoutSaving();
     return "";
   }
 }

Lab.Client/src/main/java/me/zinch/Lab6/Client/commands/FilterLessThanCharacter.java

@@ -0,0 +1,33 @@
+package me.zinch.Lab6.Client.commands;
+
+import me.zinch.Lab6.Client.client.Client;
+import me.zinch.Lab6.Client.exceptions.CommandActionException;
+import me.zinch.Lab6.Domain.dto.BodylessMessage;
+import me.zinch.Lab6.Domain.dto.MessageType;
+import me.zinch.Lab6.Domain.models.DragonCharacter;
+
+import java.io.IOException;
+import java.util.regex.Pattern;
+
+public class FilterLessThanCharacter extends Command {
+    public FilterLessThanCharacter() {
+        super(
+            "filter_less_than_character",
+            "вывести элементы, значение поля character которых меньше заданного",
+            Pattern.compile("^filter_less_than_character\\s+(CUNNING|WISE|EVIL|CHAOTIC|FICKLE)\\s*$")
+        );
+    }
+
+    @Override
+    public String action(Client client) throws CommandActionException {
+        try {
+            var character = DragonCharacter.valueOf(getName().split("\\s+")[1]);
+            var response = (BodylessMessage) client.sendMessage(
+                new BodylessMessage(MessageType.GET, "filter_less_than_character " + character.name())
+            );
+            return response.getBody().toString();
+        } catch (IOException | ClassNotFoundException e) {
+            throw new CommandActionException(e);
+        }
+    }
+} 

Lab.Client/src/main/java/me/zinch/Lab6/Client/commands/GroupCountingByType.java

@@ -0,0 +1,24 @@
+package me.zinch.Lab6.Client.commands;
+
+import me.zinch.Lab6.Client.client.Client;
+import me.zinch.Lab6.Client.exceptions.CommandActionException;
+import me.zinch.Lab6.Domain.dto.BodylessMessage;
+import me.zinch.Lab6.Domain.dto.MessageType;
+
+import java.io.IOException;
+
+public class GroupCountingByType extends Command {
+    public GroupCountingByType() {
+        super("group_counting_by_type", "сгруппировать элементы коллекции по значению поля type, вывести количество элементов в каждой группе");
+    }
+
+    @Override
+    public String action(Client client) throws CommandActionException {
+        try {
+            var response = (BodylessMessage) client.sendMessage(new BodylessMessage(MessageType.GET, "group_counting_by_type"));
+            return response.getBody().toString();
+        } catch (IOException | ClassNotFoundException e) {
+            throw new CommandActionException(e);
+        }
+    }
+} 

Lab.Client/src/main/java/me/zinch/Lab6/Client/commands/Head.java

@@ -0,0 +1,24 @@
+package me.zinch.Lab6.Client.commands;
+
+import me.zinch.Lab6.Client.client.Client;
+import me.zinch.Lab6.Client.exceptions.CommandActionException;
+import me.zinch.Lab6.Domain.dto.BodylessMessage;
+import me.zinch.Lab6.Domain.dto.MessageType;
+
+import java.io.IOException;
+
+public class Head extends Command {
+    public Head() {
+        super("head", "вывести первый элемент коллекции");
+    }
+
+    @Override
+    public String action(Client client) throws CommandActionException {
+        try {
+            var response = (BodylessMessage) client.sendMessage(new BodylessMessage(MessageType.GET, "head"));
+            return response.getBody().toString();
+        } catch (IOException | ClassNotFoundException e) {
+            throw new CommandActionException(e);
+        }
+    }
+} 

Lab.Client/src/main/java/me/zinch/Lab6/Client/commands/Help.java

@@ -1,6 +1,6 @@
-package me.zinch.commands;
+package me.zinch.Lab6.Client.commands;
 
-import me.zinch.wrapper.ProductCollection;
+import me.zinch.Lab6.Client.client.Client;
 
 /**
  * A command to display help for available commands.
@@ -11,7 +11,7 @@ public class Help extends Command {
   }
 
   @Override
-  public String action(ProductCollection productCollection) {
+  public String action(Client client) {
     return CommandManager.getRegisteredCommand();
   }
 }

Lab.Client/src/main/java/me/zinch/Lab6/Client/commands/History.java

@@ -0,0 +1,31 @@
+package me.zinch.Lab6.Client.commands;
+
+import me.zinch.Lab6.Client.client.Client;
+import me.zinch.Lab6.Client.exceptions.CommandActionException;
+import me.zinch.Lab6.Domain.dto.BodylessMessage;
+import me.zinch.Lab6.Domain.dto.MessageType;
+
+import java.io.IOException;
+import java.util.LinkedList;
+import java.util.Queue;
+
+public class History extends Command {
+    private static final int HISTORY_SIZE = 10;
+    private static final Queue<String> commandHistory = new LinkedList<>();
+
+    public History() {
+        super("history", "вывести последние 10 команд (без их аргументов)");
+    }
+
+    public static void addCommand(String command) {
+        commandHistory.offer(command);
+        if (commandHistory.size() > HISTORY_SIZE) {
+            commandHistory.poll();
+        }
+    }
+
+    @Override
+    public String action(Client client) throws CommandActionException {
+        return String.join("\n", commandHistory);
+    }
+} 

Lab.Client/src/main/java/me/zinch/Lab6/Client/commands/Info.java

@@ -0,0 +1,10 @@
+package me.zinch.Lab6.Client.commands;
+
+/**
+ * A command to display information about the collection (type, initialization date, number of elements, etc.) to the standard output stream.
+ */
+public class Info extends Command {
+  public Info() {
+    super("info", "вывести в стандартный поток вывода информацию о коллекции (тип, дата инициализации, количество элементов и т.д.)");
+  }
+}

Lab.Client/src/main/java/me/zinch/Lab6/Client/commands/MaxByWeight.java

@@ -0,0 +1,24 @@
+package me.zinch.Lab6.Client.commands;
+
+import me.zinch.Lab6.Client.client.Client;
+import me.zinch.Lab6.Client.exceptions.CommandActionException;
+import me.zinch.Lab6.Domain.dto.BodylessMessage;
+import me.zinch.Lab6.Domain.dto.MessageType;
+
+import java.io.IOException;
+
+public class MaxByWeight extends Command {
+    public MaxByWeight() {
+        super("max_by_weight", "вывести любой объект из коллекции, значение поля weight которого является максимальным");
+    }
+
+    @Override
+    public String action(Client client) throws CommandActionException {
+        try {
+            var response = (BodylessMessage) client.sendMessage(new BodylessMessage(MessageType.GET, "max_by_weight"));
+            return response.getBody().toString();
+        } catch (IOException | ClassNotFoundException e) {
+            throw new CommandActionException(e);
+        }
+    }
+} 

Lab.Client/src/main/java/me/zinch/Lab6/Client/commands/Remove.java

@@ -0,0 +1,33 @@
+package me.zinch.Lab6.Client.commands;
+
+import me.zinch.Lab6.Client.client.Client;
+import me.zinch.Lab6.Client.console.Console;
+import me.zinch.Lab6.Client.exceptions.CommandActionException;
+import me.zinch.Lab6.Domain.dto.BodyfulMessage;
+import me.zinch.Lab6.Domain.dto.BodylessMessage;
+import me.zinch.Lab6.Domain.dto.MessageType;
+
+import java.io.IOException;
+import java.util.regex.Pattern;
+
+/**
+ * A command to remove an element from the collection by its id.
+ */
+public class Remove extends Command {
+  public Remove() {
+    super("remove_by_id id", "удалить элемент из коллекции по его id", Pattern.compile("^remove_by_id .+"));
+  }
+
+  @Override
+  public String action(Client client) throws CommandActionException {
+    try {
+      Long id = Long.parseLong(Console.getLastCommand().split(" ")[1]);
+      var response = (BodylessMessage) client.sendMessage(new BodyfulMessage(MessageType.POST, Console.getLastCommand(), id));
+      return response.getBody().toString();
+    } catch (NumberFormatException e) {
+      return "Неверный аргумент, id может быть только число";
+    } catch (IOException | ClassNotFoundException e) {
+      throw new CommandActionException(e);
+    }
+  }
+}

Lab.Client/src/main/java/me/zinch/Lab6/Client/commands/RemoveHead.java

@@ -0,0 +1,24 @@
+package me.zinch.Lab6.Client.commands;
+
+import me.zinch.Lab6.Client.client.Client;
+import me.zinch.Lab6.Client.exceptions.CommandActionException;
+import me.zinch.Lab6.Domain.dto.BodylessMessage;
+import me.zinch.Lab6.Domain.dto.MessageType;
+
+import java.io.IOException;
+
+public class RemoveHead extends Command {
+    public RemoveHead() {
+        super("remove_head", "вывести первый элемент коллекции и удалить его");
+    }
+
+    @Override
+    public String action(Client client) throws CommandActionException {
+        try {
+            var response = (BodylessMessage) client.sendMessage(new BodylessMessage(MessageType.GET, "remove_head"));
+            return response.getBody().toString();
+        } catch (IOException | ClassNotFoundException e) {
+            throw new CommandActionException(e);
+        }
+    }
+} 

Lab.Client/src/main/java/me/zinch/Lab6/Client/commands/Show.java

@@ -1,6 +1,4 @@
-package me.zinch.commands;
-
-import me.zinch.wrapper.ProductCollection;
+package me.zinch.Lab6.Client.commands;
 
 /**
  * A command to display all elements of the collection in string representation to the standard output stream.
@@ -9,9 +7,4 @@ public class Show extends Command {
   public Show() {
     super("show", "вывести в стандартный поток вывода все элементы коллекции в строковом представлении");
   }
-
-  @Override
-  public String action(ProductCollection productCollection) {
-    return productCollection.toString();
-  }
 }

Lab.Client/src/main/java/me/zinch/Lab6/Client/commands/UnknownCommand.java

@@ -1,6 +1,6 @@
-package me.zinch.commands;
+package me.zinch.Lab6.Client.commands;
 
-import me.zinch.wrapper.ProductCollection;
+import me.zinch.Lab6.Client.client.Client;
 
 /**
  * Represents an unknown command.
@@ -11,7 +11,7 @@ public class UnknownCommand extends Command {
   }
 
   @Override
-  public String action(ProductCollection productCollection) {
+  public String action(Client client) {
     return "Команда не распознана.";
   }
 }

Lab.Client/src/main/java/me/zinch/Lab6/Client/commands/Update.java

@@ -0,0 +1,48 @@
+package me.zinch.Lab6.Client.commands;
+
+import me.zinch.Lab6.Client.client.Client;
+import me.zinch.Lab6.Client.console.Console;
+import me.zinch.Lab6.Client.exceptions.CommandActionException;
+import me.zinch.Lab6.Domain.dto.BodyfulMessage;
+import me.zinch.Lab6.Domain.dto.BodylessMessage;
+import me.zinch.Lab6.Domain.dto.MessageBody;
+import me.zinch.Lab6.Domain.dto.MessageType;
+
+import java.io.IOException;
+import java.util.regex.Pattern;
+
+/**
+ * A command to update the value of an element in the collection, whose id is specified.
+ */
+public class Update extends Command {
+  public Update() {
+    super("update id {element}", "обновить значение элемента коллекции, id которого равен заданному", Pattern.compile("^update .+"));
+  }
+
+  @Override
+  public String action(Client client) throws CommandActionException {
+    try {
+      var command = Console.getLastCommand();
+      Long id = Long.parseLong(command.split(" ")[1]);
+
+      var isIdExists = new IsIdExists();
+      Console.appendHistory(String.format("%s %s", isIdExists.getSignature(), id));
+      isIdExists.action(client);
+
+      var getProductById = new GetProductById();
+      Console.appendHistory(String.format("%s %s", getProductById.getSignature(), id));
+      var product = getProductById.action(client);
+
+      Console.log("Вы собираетесь обновить следующий продукт");
+      Console.log(product);
+
+      var productDTO = Console.readProductDTO();
+      var response = (BodylessMessage) client.sendMessage(
+              new BodyfulMessage(MessageType.POST, command,
+                      new MessageBody(String.format("%s %s", command, id), productDTO)));
+      return response.getBody().toString();
+    } catch (IOException | ClassNotFoundException | NumberFormatException e) {
+      throw new CommandActionException(e);
+    }
+  }
+}

Lab.Client/src/main/java/me/zinch/Lab6/Client/console/Console.java

@@ -0,0 +1,208 @@
+package me.zinch.Lab6.Client.console;
+
+import me.zinch.Lab6.Client.client.Client;
+import me.zinch.Lab6.Client.commands.CommandManager;
+import me.zinch.Lab6.Client.exceptions.ColorFormatException;
+import me.zinch.Lab6.Client.exceptions.CommandActionException;
+import me.zinch.Lab6.Client.exceptions.ConnectionErrorException;
+import me.zinch.Lab6.Client.exceptions.ResponseException;
+import me.zinch.Lab6.Client.exceptions.UnitOfMeasureFormatException;
+import me.zinch.Lab6.Domain.models.Color;
+import me.zinch.Lab6.Domain.models.Coordinates;
+import me.zinch.Lab6.Domain.models.Location;
+import me.zinch.Lab6.Domain.models.Person;
+import me.zinch.Lab6.Domain.models.ProductDTO;
+import me.zinch.Lab6.Domain.models.UnitOfMeasure;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.NoSuchElementException;
+import java.util.Scanner;
+
+/**
+ * Console class provides methods for interacting with the console, reading user input, and managing application flow.
+ * This class includes methods for appending input history, stopping the application, reading product DTO from the console, and running the application loop.
+ */
+public class Console {
+  private static final Scanner scanner = new Scanner(System.in);
+  private static final List<String> history = new ArrayList<>();
+  private static boolean isRunning = true;
+  private static boolean isExitMessageShowed = false;
+  private static Client client;
+
+  public static void appendHistory(String input) {
+    history.add(input);
+  }
+
+  public static void log(Object msg) {
+    if (isRunning) System.out.println(msg.toString());
+  }
+
+  public static void log() {
+    log("");
+  }
+
+  public static void stopAppWithoutSaving() {
+    showExitMessage();
+    isRunning = false;
+  }
+
+  public static void stopAppWithSaving() {
+    stopAppWithoutSaving();
+  }
+
+  public static void showExitMessage() {
+    if (!isExitMessageShowed) log("\nВсего хорошего!");
+    isExitMessageShowed = true;
+  }
+
+  public static String getLastCommand() {
+    return history.get(history.size() - 1);
+  }
+
+
+  private static String readString() {
+    if (!scanner.hasNextLine()) Console.stopAppWithSaving();
+    var input = scanner.nextLine().trim();
+    return input.isEmpty() ? null : input;
+  }
+
+  private static Long readLong() {
+    var input = readString();
+    if (input == null || input.isEmpty()) return null;
+    try {
+      return Long.parseLong(input);
+    } catch (NumberFormatException e) {
+      throw new NumberFormatException(String.format("Не могу распознать %s как число", input));
+    }
+  }
+
+  private static Color readColor() throws ColorFormatException {
+    System.out.format("Цвет волос(%s): ", Color.getColorsString());
+    var input = readString();
+    if (input == null || input.isEmpty()) return null;
+    try {
+      return Color.create(Integer.parseInt(input));
+    } catch (NumberFormatException | ArrayIndexOutOfBoundsException e) {
+      try {
+        return Color.create(input);
+      } catch (IllegalArgumentException ex) {
+        throw new ColorFormatException(ex.getMessage());
+      }
+    }
+  }
+
+  private static UnitOfMeasure readUnitOfMeasure() throws UnitOfMeasureFormatException {
+    System.out.format("Единица измерения(%s): ", UnitOfMeasure.getUnitOfMeasuerString());
+    var input = readString();
+    try {
+      return UnitOfMeasure.create(Integer.parseInt(input));
+    } catch (NumberFormatException | ArrayIndexOutOfBoundsException e) {
+      try {
+        return UnitOfMeasure.create(input);
+      } catch (IllegalArgumentException ex) {
+        throw new ColorFormatException(ex.getMessage());
+      }
+    }
+  }
+
+  private static Location readLocation() throws NumberFormatException {
+    System.out.print("Создать поле Location? (Y/n): ");
+    var input = readString();
+    if (input != null && input.equalsIgnoreCase("n")) return null;
+    System.out.print("Координата x локации: ");
+    var locationX = Float.parseFloat(readString());
+    System.out.print("Координата y локации: ");
+    var locationY = Integer.parseInt(readString());
+    System.out.print("Название: ");
+    var locationName = readString();
+    return new Location(locationX, locationY, locationName);
+  }
+
+  private static void setField(String fieldName, Runnable function) {
+    while (isRunning) {
+      if (fieldName != null) System.out.format("%s: ", fieldName);
+      try {
+        function.run();
+        return;
+      } catch (NullPointerException e) {
+        log("Произошла ошибка при заполнении поля\nПоле не может быть пустым");
+      } catch (Exception e) {
+        System.out.format("Произошла ошибка при заполнении поля%n%s%n", e.getMessage());
+      }
+    }
+  }
+
+  private static void setField(Runnable function) {
+    setField(null, function);
+  }
+
+  private static String readField(String message) {
+    System.out.print(message + ": ");
+    return readString();
+  }
+
+  public static ProductDTO readProductDTO() {
+    var productDTO = new ProductDTO();
+    var coordinates = new Coordinates();
+    var owner = new Person();
+    log("Заполните следующие поля: ");
+
+    setField("Название [не может быть пустым]", () -> productDTO.setName(readString()));
+    setField("Координата x [должна быть меньше 884]", () -> coordinates.setX(readLong()));
+    setField("Координата y [должна быть больше -427, не может быть пустой]", () -> coordinates.setY(readLong()));
+    setField("Цена [должна быть больше 0, не может быть пустой]", () -> productDTO.setPrice(readLong()));
+    setField("Номер части [не больше 82 символов, должен быть уникальным]", () -> productDTO.setPartNumber(readString()));
+    setField("Себестоимость [не может быть пустым]", () -> productDTO.setManufactureCost(readLong()));
+    setField(() -> productDTO.setUnitOfMeasure(readUnitOfMeasure()));
+    setField("Имя владельца [не может быть пустым]", () -> owner.setName(readString()));
+    setField("Данные паспорта [длина строки от 5 до 22, не может быть пустым]", () -> owner.setPassportID(readString()));
+    setField(() -> owner.setHairColor(readColor()));
+    setField(() -> owner.setLocation(readLocation()));
+
+    productDTO.setCoordinates(coordinates);
+    productDTO.setOwner(owner);
+    return productDTO;
+  }
+
+  public static void run() {
+    while (client == null) {
+      try {
+        var address = readField("Хост");
+        int port = Integer.parseInt(readField("Порт"));
+        client = new Client(address, port);
+      } catch (NumberFormatException e) {
+        log("Порт должен быть числом от 1 до 65535");
+      } catch (ResponseException | ConnectionErrorException e) {
+        log("Ошибка при подключении\nПопробуйте ещё раз");
+      }
+    }
+
+    log("Добро пожаловать! Для просмотра команд введите help");
+
+    while (isRunning) {
+      System.out.print(":");
+
+      try {
+        var input = scanner.nextLine().trim();
+        var command = CommandManager.getCommandByInput(input);
+
+        if (command.isPresent()) {
+          appendHistory(input);
+
+          try {
+            log(command.get().action(client));
+          } catch (CommandActionException e) {
+            log(e.getMessage());
+          }
+        } else {
+          log("Такой команды не существует. Напишите help, чтобы посмотреть список доступных команд.");
+        }
+      } catch (NoSuchElementException e) {
+        stopAppWithoutSaving();
+      }
+      log();
+    }
+    scanner.close();
+  }
+}

Lab.Client/src/main/java/me/zinch/Lab6/Client/console/ShutdownHook.java

@@ -0,0 +1,10 @@
+package me.zinch.Lab6.Client.console;
+
+/**
+ * Represents a shutdown hook that is executed when the application is stopped.
+ */
+public class ShutdownHook extends Thread {
+  public ShutdownHook() {
+    super(new Thread(Console::stopAppWithSaving));
+  }
+}

Lab.Client/src/main/java/me/zinch/Lab6/Client/exceptions/ColorFormatException.java

@@ -1,4 +1,4 @@
-package me.zinch.exceptions;
+package me.zinch.Lab6.Client.exceptions;
 
 public class ColorFormatException extends IllegalArgumentException {
   public ColorFormatException() {

Lab.Client/src/main/java/me/zinch/Lab6/Client/exceptions/CommandActionException.java

@@ -1,4 +1,4 @@
-package me.zinch.exceptions;
+package me.zinch.Lab6.Client.exceptions;
 
 /**
  * Represents an exception that occurs during the execution of a command action.

Lab.Client/src/main/java/me/zinch/Lab6/Client/exceptions/ConnectionErrorException.java

@@ -0,0 +1,9 @@
+package me.zinch.Lab6.Client.exceptions;
+
+import java.io.IOException;
+
+public class ConnectionErrorException extends IOException {
+  public ConnectionErrorException() {
+    super("Произошла ошибка при подключении, сервер не доступен");
+  }
+}

Lab.Client/src/main/java/me/zinch/Lab6/Client/exceptions/DbInitializationException.java

@@ -1,4 +1,4 @@
-package me.zinch.exceptions;
+package me.zinch.Lab6.Client.exceptions;
 
 import java.io.IOException;
 
@@ -9,4 +9,8 @@ public class DbInitializationException extends IOException {
   public DbInitializationException() {
     super("Ошибка! Не удалось инициализировать БД. Проверьте, что структура БД верна.");
   }
+
+  public DbInitializationException(String message) {
+    super(message);
+  }
 }

Lab.Client/src/main/java/me/zinch/Lab6/Client/exceptions/IllegalProductDtoException.java

@@ -1,4 +1,4 @@
-package me.zinch.exceptions;
+package me.zinch.Lab6.Client.exceptions;
 
 /**
  * Represents an exception that occurs when an illegal product DTO is encountered during the creation or modification of a product.

Lab.Client/src/main/java/me/zinch/Lab6/Client/exceptions/ResponseException.java

@@ -0,0 +1,7 @@
+package me.zinch.Lab6.Client.exceptions;
+
+public class ResponseException extends ClassNotFoundException {
+  public ResponseException() {
+    super("Ошибка при обработке данных от сервера.");
+  }
+}

Lab.Client/src/main/java/me/zinch/Lab6/Client/exceptions/UnitOfMeasureFormatException.java

@@ -1,4 +1,4 @@
-package me.zinch.exceptions;
+package me.zinch.Lab6.Client.exceptions;
 
 public class UnitOfMeasureFormatException extends IllegalArgumentException {
   public UnitOfMeasureFormatException() {

Lab.Client/src/main/java/me/zinch/Lab6/Client/files/ScriptLoader.java

@@ -1,4 +1,4 @@
-package me.zinch.files;
+package me.zinch.Lab6.Client.files;
 
 import java.io.BufferedInputStream;
 import java.io.FileInputStream;

Lab.Domain/pom.xml

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xmlns="http://maven.apache.org/POM/4.0.0"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>me.zinch</groupId>
+    <artifactId>Lab6-Domain</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-annotations</artifactId>
+            <version>2.17.1</version>
+            <scope>compile</scope>
+        </dependency>
+        <dependency>
+            <groupId>jakarta.validation</groupId>
+            <artifactId>jakarta.validation-api</artifactId>
+            <version>3.0.2</version>
+            <scope>compile</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.hibernate.validator</groupId>
+            <artifactId>hibernate-validator</artifactId>
+            <version>8.0.1.Final</version>
+            <scope>compile</scope>
+        </dependency>
+    </dependencies>
+
+</project>

Lab.Domain/src/main/java/me/zinch/Lab6/Domain/dto/BodyfulMessage.java

@@ -0,0 +1,10 @@
+package me.zinch.Lab6.Domain.dto;
+
+import java.io.Serializable;
+
+public class BodyfulMessage extends Message {
+  public BodyfulMessage(MessageType type, String command, Serializable body) {
+    this.setType(type);
+    this.setBody(new MessageBody(command, body));
+  }
+}

Lab.Domain/src/main/java/me/zinch/Lab6/Domain/dto/BodylessMessage.java

@@ -0,0 +1,12 @@
+package me.zinch.Lab6.Domain.dto;
+
+public class BodylessMessage extends Message {
+  public BodylessMessage(MessageType type) {
+    this.setType(type);
+  }
+
+  public BodylessMessage(MessageType type, String command) {
+    this.setType(type);
+    this.setBody(command);
+  }
+}

Lab.Domain/src/main/java/me/zinch/Lab6/Domain/dto/Message.java

@@ -0,0 +1,32 @@
+package me.zinch.Lab6.Domain.dto;
+
+import java.io.Serializable;
+
+public abstract class Message implements Serializable {
+  private MessageType type;
+  private Serializable body;
+
+  public final MessageType getType() {
+    return type;
+  }
+
+  public final void setType(MessageType type) {
+    this.type = type;
+  }
+
+  public final Object getBody() {
+    return body;
+  }
+
+  public final void setBody(Serializable body) {
+    this.body = body;
+  }
+
+  @Override
+  public String toString() {
+    return "Message{" +
+            "type=" + type +
+            ", body=" + body +
+            '}';
+  }
+}

Lab.Domain/src/main/java/me/zinch/Lab6/Domain/dto/MessageBody.java

@@ -0,0 +1,29 @@
+package me.zinch.Lab6.Domain.dto;
+
+import java.io.Serializable;
+
+public class MessageBody implements Serializable {
+  private String command;
+  private Serializable body;
+
+  public MessageBody(String command, Serializable body) {
+    this.command = command;
+    this.body = body;
+  }
+
+  public String getCommand() {
+    return command;
+  }
+
+  public void setCommand(String command) {
+    this.command = command;
+  }
+
+  public Serializable getBody() {
+    return body;
+  }
+
+  public void setBody(Serializable body) {
+    this.body = body;
+  }
+}

Lab.Domain/src/main/java/me/zinch/Lab6/Domain/dto/MessageType.java

@@ -0,0 +1,11 @@
+package me.zinch.Lab6.Domain.dto;
+
+import java.io.Serializable;
+
+public enum MessageType implements Serializable {
+  GET,
+  POST,
+  ERROR,
+  OK,
+  HELLO
+}

Lab.Domain/src/main/java/me/zinch/Lab6/Domain/dto/UpdateBody.java

@@ -0,0 +1,31 @@
+package me.zinch.Lab6.Domain.dto;
+
+import me.zinch.Lab6.Domain.models.ProductDTO;
+
+import java.io.Serializable;
+
+public class UpdateBody implements Serializable {
+  private Long id;
+  private ProductDTO productDTO;
+
+  public UpdateBody(Long id, ProductDTO productDTO) {
+    this.id = id;
+    this.productDTO = productDTO;
+  }
+
+  public Long getId() {
+    return id;
+  }
+
+  public void setId(Long id) {
+    this.id = id;
+  }
+
+  public ProductDTO getProductDTO() {
+    return productDTO;
+  }
+
+  public void setProductDTO(ProductDTO productDTO) {
+    this.productDTO = productDTO;
+  }
+}

Lab.Domain/src/main/java/me/zinch/Lab6/Domain/exceptions/ValidationException.java

@@ -1,10 +1,11 @@
-package me.zinch.exceptions;
+package me.zinch.Lab6.Domain.exceptions;
 
 /**
  * Represents an exception related to validation errors.
  */
 public class ValidationException extends jakarta.validation.ValidationException {
-  public ValidationException() {}
+  public ValidationException() {
+  }
 
   public ValidationException(String message) {
     super(message);

Lab.Domain/src/main/java/me/zinch/Lab6/Domain/models/Color.java

@@ -1,5 +1,6 @@
-package me.zinch.models;
+package me.zinch.Lab6.Domain.models;
 
+import java.io.Serializable;
 import java.util.Arrays;
 import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
@@ -7,7 +8,7 @@ import java.util.concurrent.atomic.AtomicInteger;
 /**
  * Represents a color enumeration.
  */
-public enum Color {
+public enum Color implements Serializable {
   GREEN("Зелёный"),
   BLACK("Чёрный"),
   BLUE("Синий"),
@@ -20,10 +21,6 @@ public enum Color {
     this.color = color;
   }
 
-  private String getColor() {
-    return color;
-  }
-
   public static Color create(String input) throws IllegalArgumentException {
     for (var unit : List.of(Color.values())) {
       if (unit.getColor().equalsIgnoreCase(input)) return unit;
@@ -42,6 +39,10 @@ public enum Color {
             .toList());
   }
 
+  private String getColor() {
+    return color;
+  }
+
   @Override
   public String toString() {
     return "Color{" +

Lab.Domain/src/main/java/me/zinch/Lab6/Domain/models/Coordinates.java

@@ -0,0 +1,56 @@
+package me.zinch.Lab6.Domain.models;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import jakarta.validation.constraints.Max;
+import jakarta.validation.constraints.NotNull;
+import java.io.Serializable;
+import java.util.Objects;
+
+/**
+ * Represents coordinates with x and y values.
+ */
+public class Coordinates implements Serializable {
+    @Max(value = 353, message = "Coordinates: Максимальное значение поля x: 353")
+    @JsonProperty("x")
+    private long x; // Максимальное значение поля: 353
+
+    @NotNull(message = "Coordinates: Поле y не может быть null")
+    @JsonProperty("y")
+    private Integer y; // Поле не может быть null
+
+    public Coordinates() {}
+
+    public Coordinates(long x, Integer y) {
+        this.x = x;
+        this.y = y;
+    }
+
+    public long getX() {
+        return x;
+    }
+
+    public Integer getY() {
+        return y;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Coordinates that = (Coordinates) o;
+        return x == that.x && Objects.equals(y, that.y);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(x, y);
+    }
+
+    @Override
+    public String toString() {
+        return "Coordinates{" +
+                "x=" + x +
+                ", y=" + y +
+                '}';
+    }
+}

Lab.Domain/src/main/java/me/zinch/Lab6/Domain/models/Dragon.java

@@ -0,0 +1,148 @@
+package me.zinch.Lab6.Domain.models;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import jakarta.validation.constraints.Min;
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotNull;
+
+import java.io.Serializable;
+import java.time.LocalDateTime;
+import java.util.Objects;
+
+public class Dragon implements Serializable, Comparable<Dragon> {
+    @NotNull(message = "Dragon: Поле id не может быть null")
+    @Min(value = 1, message = "Dragon: Значение поля id должно быть больше 0")
+    @JsonProperty("id")
+    private Integer id; // Поле не может быть null, Значение поля должно быть больше 0, Значение этого поля должно быть уникальным, Значение этого поля должно генерироваться автоматически
+
+    @NotBlank(message = "Dragon: Строка name не может быть пустой или null")
+    @JsonProperty("name")
+    private String name; // Поле не может быть null, Строка не может быть пустой
+
+    @NotNull(message = "Dragon: Поле coordinates не может быть null")
+    @JsonProperty("coordinates")
+    private Coordinates coordinates; // Поле не может быть null
+
+    @NotNull(message = "Dragon: Поле creationDate не может быть null")
+    @JsonProperty("creationDate")
+    private LocalDateTime creationDate; // Поле не может быть null, Значение этого поля должно генерироваться автоматически
+
+    @NotNull(message = "Dragon: Поле age не может быть null")
+    @Min(value = 1, message = "Dragon: Значение поля age должно быть больше 0")
+    @JsonProperty("age")
+    private Integer age; // Значение поля должно быть больше 0, Поле не может быть null
+
+    @Min(value = 1, message = "Dragon: Значение поля weight должно быть больше 0")
+    @JsonProperty("weight")
+    private long weight; // Значение поля должно быть больше 0
+
+    @NotNull(message = "Dragon: Поле type не может быть null")
+    @JsonProperty("type")
+    private DragonType type; // Поле не может быть null
+
+    @NotNull(message = "Dragon: Поле character не может быть null")
+    @JsonProperty("character")
+    private DragonCharacter character; // Поле не может быть null
+
+    @JsonProperty("head")
+    private DragonHead head;
+
+    public Dragon() {}
+
+    public Dragon(Integer id,
+                String name,
+                Coordinates coordinates,
+                LocalDateTime creationDate,
+                Integer age,
+                long weight,
+                DragonType type,
+                DragonCharacter character,
+                DragonHead head) {
+        this.id = id;
+        this.name = name;
+        this.coordinates = coordinates;
+        this.creationDate = creationDate;
+        this.age = age;
+        this.weight = weight;
+        this.type = type;
+        this.character = character;
+        this.head = head;
+    }
+
+    public Integer getId() {
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public Coordinates getCoordinates() {
+        return coordinates;
+    }
+
+    public LocalDateTime getCreationDate() {
+        return creationDate;
+    }
+
+    public Integer getAge() {
+        return age;
+    }
+
+    public long getWeight() {
+        return weight;
+    }
+
+    public DragonType getType() {
+        return type;
+    }
+
+    public DragonCharacter getCharacter() {
+        return character;
+    }
+
+    public DragonHead getHead() {
+        return head;
+    }
+
+    @Override
+    public String toString() {
+        return "Dragon{" +
+                "id=" + id +
+                ", name='" + name + '\'' +
+                ", coordinates=" + coordinates +
+                ", creationDate=" + creationDate +
+                ", age=" + age +
+                ", weight=" + weight +
+                ", type=" + type +
+                ", character=" + character +
+                ", head=" + head +
+                '}';
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Dragon dragon = (Dragon) o;
+        return weight == dragon.weight &&
+                Objects.equals(id, dragon.id) &&
+                Objects.equals(name, dragon.name) &&
+                Objects.equals(coordinates, dragon.coordinates) &&
+                Objects.equals(creationDate, dragon.creationDate) &&
+                Objects.equals(age, dragon.age) &&
+                type == dragon.type &&
+                character == dragon.character &&
+                Objects.equals(head, dragon.head);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, name, coordinates, creationDate, age, weight, type, character, head);
+    }
+
+    @Override
+    public int compareTo(Dragon other) {
+        return this.name.compareTo(other.name);
+    }
+} 

Lab.Domain/src/main/java/me/zinch/Lab6/Domain/models/DragonCharacter.java

@@ -0,0 +1,9 @@
+package me.zinch.Lab6.Domain.models;
+
+public enum DragonCharacter {
+    CUNNING,
+    WISE,
+    EVIL,
+    CHAOTIC,
+    FICKLE
+} 

Lab.Domain/src/main/java/me/zinch/Lab6/Domain/models/DragonHead.java

@@ -0,0 +1,40 @@
+package me.zinch.Lab6.Domain.models;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import java.io.Serializable;
+import java.util.Objects;
+
+public class DragonHead implements Serializable {
+    @JsonProperty("size")
+    private Float size; // Поле может быть null
+
+    public DragonHead() {}
+
+    public DragonHead(Float size) {
+        this.size = size;
+    }
+
+    public Float getSize() {
+        return size;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        DragonHead that = (DragonHead) o;
+        return Objects.equals(size, that.size);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(size);
+    }
+
+    @Override
+    public String toString() {
+        return "DragonHead{" +
+                "size=" + size +
+                '}';
+    }
+} 

Lab.Domain/src/main/java/me/zinch/Lab6/Domain/models/DragonType.java

@@ -0,0 +1,7 @@
+package me.zinch.Lab6.Domain.models;
+
+public enum DragonType {
+    WATER,
+    AIR,
+    FIRE
+} 

Lab.Domain/src/main/java/me/zinch/Lab6/Domain/models/Location.java

@@ -1,15 +1,16 @@
-package me.zinch.models;
+package me.zinch.Lab6.Domain.models;
 
 import com.fasterxml.jackson.annotation.JsonProperty;
 import jakarta.validation.constraints.NotNull;
-import me.zinch.validator.NotEmpty;
+import me.zinch.Lab6.Domain.validator.NotEmpty;
 
+import java.io.Serializable;
 import java.util.Objects;
 
 /**
  * Represents a location with x and y coordinates and a name.
  */
-public class Location {
+public class Location implements Serializable {
   @JsonProperty("x")
   private float x;
 
@@ -21,7 +22,8 @@ public class Location {
   @JsonProperty("name")
   private String name; //Строка не может быть пустой, Поле может быть null
 
-  public Location() {}
+  public Location() {
+  }
 
   public Location(float x, Integer y, String name) {
     this.x = x;

Lab.Domain/src/main/java/me/zinch/Lab6/Domain/models/Person.java

@@ -1,16 +1,18 @@
-package me.zinch.models;
+package me.zinch.Lab6.Domain.models;
 
 import com.fasterxml.jackson.annotation.JsonProperty;
 import jakarta.validation.constraints.NotBlank;
 import jakarta.validation.constraints.NotNull;
 import jakarta.validation.constraints.Size;
+import me.zinch.Lab6.Domain.exceptions.ValidationException;
 
+import java.io.Serializable;
 import java.util.Objects;
 
 /**
  * Represents a person with a name, passport ID, hair color, and location.
  */
-public class Person {
+public class Person implements Serializable {
   @NotBlank(message = "Person: Имя персоны не может быть пустым или null")
   @JsonProperty("name")
   private String name; //Поле не может быть null, Строка не может быть пустой
@@ -26,7 +28,8 @@ public class Person {
   @JsonProperty("location")
   private Location location; //Поле может быть null
 
-  public Person() {}
+  public Person() {
+  }
 
   public Person(String name, String passportID, Color hairColor, Location location) {
     this.name = name;
@@ -36,10 +39,14 @@ public class Person {
   }
 
   public void setName(String name) {
+    if (name == null || name.isEmpty()) throw new ValidationException("Имя персоны не может быть пустым или null");
     this.name = name;
   }
 
   public void setPassportID(String passportID) {
+    if (passportID == null) throw new ValidationException("Поле passportID не может быть null");
+    if (passportID.length() < 5 || passportID.length() > 22)
+      throw new ValidationException("Длина строки passportID должна быть не меньше 5 и не должна быть больше 22");
     this.passportID = passportID;
   }
 

Lab.Domain/src/main/java/me/zinch/Lab6/Domain/models/Product.java

@@ -1,19 +1,20 @@
-package me.zinch.models;
+package me.zinch.Lab6.Domain.models;
 
 import com.fasterxml.jackson.annotation.JsonProperty;
 import jakarta.validation.constraints.Min;
 import jakarta.validation.constraints.NotBlank;
 import jakarta.validation.constraints.NotNull;
 import jakarta.validation.constraints.Size;
-import me.zinch.validator.NotEmpty;
+import me.zinch.Lab6.Domain.validator.NotEmpty;
 
+import java.io.Serializable;
 import java.time.ZonedDateTime;
 import java.util.Objects;
 
 /**
  * Represents a product with various attributes such as ID, name, coordinates, creation date, price, part number, manufacture cost, unit of measure, and owner.
  */
-public class Product {
+public class Product implements Serializable, Comparable<Product> {
   @NotNull(message = "Product: Поле id не может быть null")
   @Min(value = 1, message = "Product: Значение поля id должно быть больше 0")
   @JsonProperty("id")
@@ -52,18 +53,19 @@ public class Product {
   @JsonProperty("owner")
   private Person owner; //Поле не может быть null
 
-  public Product() {}
+  public Product() {
+  }
 
-  public Product (Long id,
-                  String name,
-                  Coordinates coordinates,
-                  ZonedDateTime creationDate,
-                  Long price,
-                  String partNumber,
-                  long manufactureCost,
-                  UnitOfMeasure unitOfMeasure,
-                  Person owner
-                  ) {
+  public Product(Long id,
+                 String name,
+                 Coordinates coordinates,
+                 ZonedDateTime creationDate,
+                 Long price,
+                 String partNumber,
+                 long manufactureCost,
+                 UnitOfMeasure unitOfMeasure,
+                 Person owner
+  ) {
     this.id = id;
     this.name = name;
     this.coordinates = coordinates;
@@ -138,4 +140,9 @@ public class Product {
   public int hashCode() {
     return Objects.hash(id, name, coordinates, creationDate, price, partNumber, manufactureCost, unitOfMeasure, owner);
   }
+
+  @Override
+  public int compareTo(Product other) {
+    return this.name.compareTo(other.name);
+  }
 }

Lab.Domain/src/main/java/me/zinch/Lab6/Domain/models/ProductDTO.java

@@ -1,20 +1,20 @@
-package me.zinch.models;
+package me.zinch.Lab6.Domain.models;
 
 import com.fasterxml.jackson.annotation.JsonProperty;
 import jakarta.validation.constraints.Min;
 import jakarta.validation.constraints.NotBlank;
 import jakarta.validation.constraints.NotNull;
 import jakarta.validation.constraints.Size;
+import me.zinch.Lab6.Domain.exceptions.ValidationException;
+import me.zinch.Lab6.Domain.validator.NotEmpty;
 
-import me.zinch.validator.NotEmpty;
-
-
+import java.io.Serializable;
 import java.time.ZonedDateTime;
 
 /**
  * Represents a Data Transfer Object (DTO) for a product with attributes such as name, coordinates, price, part number, manufacture cost, unit of measure, and owner.
  */
-public class ProductDTO {
+public class ProductDTO implements Serializable {
   @NotBlank(message = "ProductDTO: Строка name не может быть пустой или null")
   @JsonProperty("name")
   private String name; //Поле не может быть null, Строка не может быть пустой
@@ -24,7 +24,7 @@ public class ProductDTO {
   private Coordinates coordinates; //Поле не может быть null
 
   @NotNull(message = "ProductDTO: Поле price не может быть null")
-  @Min(value = 1, message = "Поле price не может быть null")
+  @Min(value = 1, message = "ProductDTO: Значение поля price должно быть больше 0")
   @JsonProperty("price")
   private Long price; //Поле не может быть null, Значение поля должно быть больше 0
 
@@ -44,7 +44,8 @@ public class ProductDTO {
   @JsonProperty("owner")
   private Person owner; //Поле не может быть null
 
-  public ProductDTO() {}
+  public ProductDTO() {
+  }
 
   public ProductDTO(String name, Coordinates coordinates, Long price, String partNumber, long manufactureCost, UnitOfMeasure unitOfMeasure, Person owner) {
     this.name = name;
@@ -72,55 +73,63 @@ public class ProductDTO {
     return name;
   }
 
+  public void setName(String name) {
+    if (name == null || name.isEmpty()) throw new ValidationException("Строка name не может быть пустой или null");
+    this.name = name;
+  }
+
   public Coordinates getCoordinates() {
     return coordinates;
   }
 
+  public void setCoordinates(Coordinates coordinates) {
+    if (coordinates == null) throw new ValidationException("Поле coordinates не может быть null");
+    this.coordinates = coordinates;
+  }
+
   public Long getPrice() {
     return price;
   }
 
+  public void setPrice(Long price) {
+    if (price == null) throw new ValidationException("Поле price не может быть null");
+    if (price <= 0) throw new ValidationException("Поле price не может быть null");
+    this.price = price;
+  }
+
   public String getPartNumber() {
     return partNumber;
   }
 
+  public void setPartNumber(String partNumber) {
+    if (partNumber.isEmpty()) throw new ValidationException("Строка partNumber не может быть пустой");
+    if (partNumber.length() > 82) throw new ValidationException("Длина строки partNumber не должна быть больше 82");
+    this.partNumber = partNumber;
+  }
+
   public long getManufactureCost() {
     return manufactureCost;
   }
 
+  public void setManufactureCost(long manufactureCost) {
+    this.manufactureCost = manufactureCost;
+  }
+
   public UnitOfMeasure getUnitOfMeasure() {
     return unitOfMeasure;
   }
 
+  public void setUnitOfMeasure(UnitOfMeasure unitOfMeasure) {
+    if (unitOfMeasure == null) throw new ValidationException("Поле unitOfMeasure не может быть null");
+    this.unitOfMeasure = unitOfMeasure;
+  }
+
   public Person getOwner() {
     return owner;
   }
 
-  public void setName(String name) {
-    this.name = name;
-  }
-
-  public void setCoordinates(Coordinates coordinates) {
-    this.coordinates = coordinates;
-  }
-
-  public void setPrice(Long price) {
-    this.price = price;
-  }
-
-  public void setPartNumber(String partNumber) {
-    this.partNumber = partNumber;
-  }
-
-  public void setManufactureCost(long manufactureCost) {
-    this.manufactureCost = manufactureCost;
-  }
-
-  public void setUnitOfMeasure(UnitOfMeasure unitOfMeasure) {
-    this.unitOfMeasure = unitOfMeasure;
-  }
-
   public void setOwner(Person owner) {
+    if (owner == null) throw new ValidationException("Поле owner не может быть null");
     this.owner = owner;
   }
 }

Lab.Domain/src/main/java/me/zinch/Lab6/Domain/models/UnitOfMeasure.java

@@ -1,5 +1,6 @@
-package me.zinch.models;
+package me.zinch.Lab6.Domain.models;
 
+import java.io.Serializable;
 import java.util.Arrays;
 import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
@@ -7,7 +8,7 @@ import java.util.concurrent.atomic.AtomicInteger;
 /**
  * Represents a unit of measure enumeration.
  */
-public enum UnitOfMeasure {
+public enum UnitOfMeasure implements Serializable {
   KILOGRAMS("Килограммы"),
   CENTIMETERS("Сантиметры"),
   GRAMS("Граммы");
@@ -18,10 +19,6 @@ public enum UnitOfMeasure {
     this.unitOfMeasure = unitOfMeasure;
   }
 
-  public String getUnitOfMeasure() {
-    return unitOfMeasure;
-  }
-
   public static UnitOfMeasure create(String input) throws IllegalArgumentException {
     for (var unit : List.of(UnitOfMeasure.values())) {
       if (unit.getUnitOfMeasure().equalsIgnoreCase(input)) return unit;
@@ -40,6 +37,9 @@ public enum UnitOfMeasure {
             .toList());
   }
 
+  public String getUnitOfMeasure() {
+    return unitOfMeasure;
+  }
 
   @Override
   public String toString() {

Lab.Domain/src/main/java/me/zinch/Lab6/Domain/validator/NotEmpty.java

@@ -1,4 +1,4 @@
-package me.zinch.validator;
+package me.zinch.Lab6.Domain.validator;
 
 import jakarta.validation.Constraint;
 import jakarta.validation.Payload;
@@ -16,6 +16,8 @@ import java.lang.annotation.Target;
 @Constraint(validatedBy = NotEmptyValidator.class)
 public @interface NotEmpty {
   String message() default "Value must not be blank";
+
   Class<?>[] groups() default {};
+
   Class<? extends Payload>[] payload() default {};
 }

Lab.Domain/src/main/java/me/zinch/Lab6/Domain/validator/NotEmptyValidator.java

@@ -1,4 +1,4 @@
-package me.zinch.validator;
+package me.zinch.Lab6.Domain.validator;
 
 import jakarta.validation.ConstraintValidator;
 import jakarta.validation.ConstraintValidatorContext;

Lab.Domain/src/main/java/me/zinch/Lab6/Domain/validator/ValidateResult.java

@@ -1,12 +1,13 @@
-package me.zinch.validator;
+package me.zinch.Lab6.Domain.validator;
 
 import jakarta.validation.ConstraintViolation;
-import jakarta.validation.ValidationException;
+import me.zinch.Lab6.Domain.exceptions.ValidationException;
 
 import java.util.Set;
 
 /**
  * Represents the result of a validation process.
+ *
  * @param <T> the type of object being validated
  */
 public class ValidateResult<T> {

Lab.Domain/src/main/java/me/zinch/Lab6/Domain/validator/Validators.java

@@ -1,12 +1,13 @@
-package me.zinch.validator;
+package me.zinch.Lab6.Domain.validator;
 
 import jakarta.validation.Validation;
 import jakarta.validation.Validator;
 import jakarta.validation.ValidatorFactory;
-import me.zinch.models.Product;
+import me.zinch.Lab6.Domain.models.Product;
 import org.hibernate.validator.HibernateValidator;
 
 import java.util.List;
+import java.util.Objects;
 import java.util.Set;
 
 /**
@@ -30,7 +31,7 @@ public class Validators {
 
   public static List<ValidateResult<Product>> validateProductList(List<Product> db) {
     var ids = db.stream().map(Product::getId).toList();
-    var partNumbers = db.stream().map(Product::getPartNumber).toList();
+    var partNumbers = db.stream().map(Product::getPartNumber).filter(Objects::nonNull).toList();
     var validations = new java.util.ArrayList<>(db.stream().map(Validators::validateObject).toList());
     if (ids.size() != Set.copyOf(ids).size()) {
       validations.add(new ValidateResult<>("Поле id должно быть уникальным"));

Lab.Domain/src/main/java/me/zinch/Lab6/Domain/wrapper/IStorage.java

@@ -0,0 +1,23 @@
+package me.zinch.Lab6.Domain.wrapper;
+
+import me.zinch.Lab6.Domain.models.Dragon;
+import me.zinch.Lab6.Domain.models.DragonCharacter;
+import me.zinch.Lab6.Domain.models.DragonType;
+
+import java.util.List;
+import java.util.Map;
+
+public interface IStorage {
+    Dragon getDragonById(Integer id);
+    Dragon addDragon(Dragon dragon);
+    Dragon updateDragon(Integer id, Dragon dragon);
+    Dragon removeDragon(Integer id);
+    String getInfo();
+    void clear();
+    Dragon getHead();
+    Dragon removeHead();
+    Dragon getMaxByWeight();
+    Map<DragonType, Long> groupCountingByType();
+    List<Dragon> filterLessThanCharacter(DragonCharacter character);
+    List<Dragon> toList();
+}

Lab.Server/pom.xml

@@ -0,0 +1,116 @@
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>me.zinch</groupId>
+    <artifactId>Lab6-Server</artifactId>
+    <version>1.0</version>
+    <packaging>jar</packaging>
+
+    <name>Lab6-Server</name>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <maven.compiler.target>17</maven.compiler.target>
+        <maven.compiler.source>17</maven.compiler.source>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.fasterxml.jackson.dataformat</groupId>
+            <artifactId>jackson-dataformat-xml</artifactId>
+            <version>2.15.0</version>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.datatype</groupId>
+            <artifactId>jackson-datatype-jsr310</artifactId>
+            <version>2.17.0</version>
+        </dependency>
+        <dependency>
+            <groupId>org.hibernate.validator</groupId>
+            <artifactId>hibernate-validator</artifactId>
+            <version>8.0.1.Final</version>
+        </dependency>
+        <dependency>
+            <groupId>org.glassfish</groupId>
+            <artifactId>jakarta.el</artifactId>
+            <version>5.0.0-M1</version>
+        </dependency>
+        <dependency>
+            <groupId>ch.qos.logback</groupId>
+            <artifactId>logback-classic</artifactId>
+            <version>1.5.6</version>
+        </dependency>
+        <dependency>
+            <groupId>ch.qos.logback</groupId>
+            <artifactId>logback-core</artifactId>
+            <version>1.5.6</version>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+            <version>2.0.13</version>
+        </dependency>
+        <dependency>
+            <groupId>me.zinch</groupId>
+            <artifactId>Lab6-Domain</artifactId>
+            <version>1.0-SNAPSHOT</version>
+            <scope>compile</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-annotations</artifactId>
+            <version>2.17.1</version>
+            <scope>compile</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.jline</groupId>
+            <artifactId>jline</artifactId>
+            <version>3.26.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-core</artifactId>
+            <version>2.23.1</version>
+        </dependency>
+        <dependency>
+            <groupId>com.opencsv</groupId>
+            <artifactId>opencsv</artifactId>
+            <version>5.9</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <artifactId>maven-assembly-plugin</artifactId>
+                <groupId>org.apache.maven.plugins</groupId>
+                <version>3.7.1</version>
+                <configuration>
+                    <archive>
+                        <manifest>
+                            <mainClass>me.zinch.Lab6.Server.App</mainClass>
+                        </manifest>
+                    </archive>
+                    <descriptorRefs>
+                        <descriptorRef>jar-with-dependencies</descriptorRef>
+                    </descriptorRefs>
+                </configuration>
+                <executions>
+                    <execution>
+                        <id>make-assembly</id>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>single</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-javadoc-plugin</artifactId>
+                <version>3.6.3</version>
+            </plugin>
+        </plugins>
+    </build>
+</project>

Lab.Server/src/main/java/me/zinch/Lab6/Server/App.java

@@ -0,0 +1,14 @@
+package me.zinch.Lab6.Server;
+
+import me.zinch.Lab6.Server.console.Console;
+
+import java.io.IOException;
+
+/**
+ * Main class for running the application.
+ */
+public class App {
+  public static void main(String[] args) throws IOException {
+    Console.run();
+  }
+}

Lab.Server/src/main/java/me/zinch/Lab6/Server/Server.java

@@ -0,0 +1,97 @@
+package me.zinch.Lab6.Server;
+
+import me.zinch.Lab6.Domain.dto.Message;
+import me.zinch.Lab6.Domain.wrapper.IStorage;
+import me.zinch.Lab6.Server.files.DbController;
+import me.zinch.Lab6.Server.modules.CommandModule;
+import me.zinch.Lab6.Server.modules.ConnectionModule;
+import me.zinch.Lab6.Server.modules.RequestModule;
+import me.zinch.Lab6.Server.modules.ResponseModule;
+import me.zinch.Lab6.Server.wrapper.ProductCollection;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.nio.channels.SelectionKey;
+import java.nio.channels.Selector;
+import java.nio.channels.SocketChannel;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Map;
+
+public class Server {
+    private static final Logger log = LoggerFactory.getLogger(Server.class);
+    private final Selector selector;
+    private final Map<SocketChannel, Message> clientMessages;
+    private final ConnectionModule connectionModule;
+    private final RequestModule requestModule;
+    private final ResponseModule responseModule;
+    private final CommandModule commandModule;
+    private final IStorage storage;
+    private boolean isRunning;
+
+    public Server(int port, IStorage collection) throws IOException {
+        selector = Selector.open();
+        clientMessages = new HashMap<>();
+        
+        if (collection == null) {
+            collection = new ProductCollection(new ArrayList<>());
+        }
+        storage = collection;
+        
+        commandModule = new CommandModule(storage);
+        connectionModule = new ConnectionModule(port, selector);
+        requestModule = new RequestModule(clientMessages);
+        responseModule = new ResponseModule(clientMessages, commandModule);
+        
+        isRunning = true;
+        log.info("Server initialized on port {}", port);
+    }
+
+    public void run() throws IOException {
+        run(() -> {});
+    }
+
+    public void run(Runnable middleware) throws IOException {
+        log.info("Server is running");
+        
+        while (isRunning) {
+            selector.select(this::handleKey);
+            middleware.run();
+        }
+    }
+
+    private void handleKey(SelectionKey key) {
+        try {
+            if (!key.isValid()) {
+                return;
+            }
+            
+            if (key.isAcceptable()) {
+                connectionModule.handleAccept(key);
+            }
+            if (key.isReadable()) {
+                requestModule.handleRead(key);
+            }
+            if (key.isWritable()) {
+                responseModule.handleWrite(key);
+            }
+        } catch (IOException | ClassNotFoundException e) {
+            log.error("Error handling key: {}", e.getMessage());
+            key.cancel();
+            try {
+                key.channel().close();
+            } catch (IOException ex) {
+                log.error("Error closing channel: {}", ex.getMessage());
+            }
+        }
+    }
+
+    public void stop() throws IOException {
+        isRunning = false;
+        connectionModule.close();
+        selector.close();
+        DbController.saveDb(storage.toList());
+        log.info("Server stopped");
+    }
+}

Lab.Server/src/main/java/me/zinch/Lab6/Server/ServerBuilder.java

@@ -0,0 +1,37 @@
+package me.zinch.Lab6.Server;
+
+import me.zinch.Lab6.Domain.wrapper.IStorage;
+import me.zinch.Lab6.Server.configs.ServerConfig;
+import me.zinch.Lab6.Server.wrapper.ProductCollection;
+
+import java.io.IOException;
+import java.util.ArrayList;
+
+public class ServerBuilder {
+  private ServerConfig serverConfig = new ServerConfig();
+
+  public ServerBuilder() {
+    serverConfig.setPort(3000);
+    serverConfig.setCollection(new ProductCollection(new ArrayList<>()));
+  }
+
+  public ServerBuilder(ServerConfig serverConfig) {
+    this.serverConfig = serverConfig;
+  }
+
+  public ServerBuilder setPort(int port) {
+    if (port < 1 || port > 65535) throw new IllegalArgumentException("Port must be between 1 and 65535");
+    serverConfig.setPort(port);
+    return new ServerBuilder(serverConfig);
+  }
+
+  public ServerBuilder setCollection(IStorage collection) {
+    serverConfig.setCollection(collection);
+    return new ServerBuilder(serverConfig);
+  }
+
+  public Server build() throws IOException {
+    return new Server(serverConfig.getPort(),
+            serverConfig.getCollection());
+  }
+}

Lab.Server/src/main/java/me/zinch/Lab6/Server/commands/Add.java

@@ -0,0 +1,31 @@
+package me.zinch.Lab6.Server.commands;
+
+import me.zinch.Lab6.Domain.exceptions.ValidationException;
+import me.zinch.Lab6.Domain.models.ProductDTO;
+import me.zinch.Lab6.Domain.validator.Validators;
+import me.zinch.Lab6.Domain.wrapper.IStorage;
+import me.zinch.Lab6.Server.exceptions.CommandActionException;
+
+import java.util.regex.Pattern;
+
+/**
+ * The Add class represents a command to add a new element to a collection.
+ * It extends the Command class.
+ */
+public class Add extends PostCommand {
+  public Add() {
+    super("add {element}", "добавить новый элемент в коллекцию", Pattern.compile("^add"));
+  }
+
+  @Override
+  public String action(IStorage productCollection, Object object) throws CommandActionException {
+    var productDTO = (ProductDTO) object;
+    try {
+      Validators.validateObject(productDTO).throwIfNotValid();
+      var product = productCollection.addProduct(productDTO);
+      return String.format("Продукт %s был добавлен под id %d", product.getName(), product.getId());
+    } catch (ValidationException e) {
+      throw new CommandActionException(String.format("Произошла ошибка при добавлении%n%s", e.getMessage()));
+    }
+  }
+}

Lab.Server/src/main/java/me/zinch/Lab6/Server/commands/AddIfMax.java

@@ -0,0 +1,38 @@
+package me.zinch.Lab6.Server.commands;
+
+import me.zinch.Lab6.Domain.exceptions.ValidationException;
+import me.zinch.Lab6.Domain.models.ProductDTO;
+import me.zinch.Lab6.Domain.validator.Validators;
+import me.zinch.Lab6.Domain.wrapper.IStorage;
+import me.zinch.Lab6.Server.exceptions.CommandActionException;
+
+import java.util.regex.Pattern;
+
+/**
+ * The AddIfMax class represents a command to add a new element to a collection if its price value exceeds the maximum price value in the collection.
+ * It extends the Command class.
+ */
+public class AddIfMax extends PostCommand {
+  public AddIfMax() {
+    super("add_if_max {element}", "добавить новый элемент в коллекцию, если его значение цены превышает значение наибольшей цены этой коллекции", Pattern.compile("^add_if_max .+"));
+  }
+
+  @Override
+  public String action(IStorage productCollection, Object object) throws CommandActionException {
+    try {
+      var productDTO = (ProductDTO) object;
+      try {
+        Validators.validateObject(productDTO).throwIfNotValid();
+        if (productCollection.getMaxPrice() == null || productCollection.getMaxPrice() < productDTO.getPrice()) {
+          var product = productCollection.addProduct(productDTO);
+          return String.format("Продукт %s был добавлен под id %d", product.getName(), product.getId());
+        }
+        return "Продукт не подходит под условие";
+      } catch (ValidationException e) {
+        throw new CommandActionException(e.getMessage());
+      }
+    } catch (NumberFormatException e) {
+      return "Неверный аргумент, id может быть только число";
+    }
+  }
+}

Lab.Server/src/main/java/me/zinch/Lab6/Server/commands/AddIfMin.java

@@ -0,0 +1,38 @@
+package me.zinch.Lab6.Server.commands;
+
+import me.zinch.Lab6.Domain.exceptions.ValidationException;
+import me.zinch.Lab6.Domain.models.ProductDTO;
+import me.zinch.Lab6.Domain.validator.Validators;
+import me.zinch.Lab6.Domain.wrapper.IStorage;
+import me.zinch.Lab6.Server.exceptions.CommandActionException;
+
+import java.util.regex.Pattern;
+
+/**
+ * The AddIfMin class represents a command to add a new element to a collection if its price is lower than the lowest price in the collection.
+ * It extends the Command class.
+ */
+public class AddIfMin extends PostCommand {
+  public AddIfMin() {
+    super("add_if_min {element}", "добавить новый элемент в коллекцию, если его значение цены меньше, чем у наименьшей цены этой коллекции", Pattern.compile("^add_if_min .+"));
+  }
+
+  @Override
+  public String action(IStorage productCollection, Object object) {
+    try {
+      var productDTO = (ProductDTO) object;
+      try {
+        Validators.validateObject(productDTO).throwIfNotValid();
+        if (productCollection.getMinPrice() == null || productCollection.getMinPrice() > productDTO.getPrice()) {
+          var product = productCollection.addProduct(productDTO);
+          return String.format("Продукт %s был добавлен под id %d", product.getName(), product.getId());
+        }
+        return "Продукт не подходит под условие";
+      } catch (ValidationException e) {
+        throw new CommandActionException(e.getMessage());
+      }
+    } catch (NumberFormatException e) {
+      return "Неверный аргумент, id может быть только число";
+    }
+  }
+}

Lab.Server/src/main/java/me/zinch/Lab6/Server/commands/Clear.java

@@ -1,18 +1,18 @@
-package me.zinch.commands;
+package me.zinch.Lab6.Server.commands;
 
-import me.zinch.wrapper.ProductCollection;
+import me.zinch.Lab6.Domain.wrapper.IStorage;
 
 /**
  * The Clear class represents a command to clear a collection.
  * It extends the Command class.
  */
-public class Clear extends Command {
+public class Clear extends GetCommand {
   public Clear() {
     super("clear", "очистить коллекцию");
   }
 
   @Override
-  public String action(ProductCollection productCollection) {
+  public String action(IStorage productCollection) {
     productCollection.clear();
     return "Коллекция была очищена";
   }

Lab.Server/src/main/java/me/zinch/Lab6/Server/commands/Command.java

@@ -1,7 +1,4 @@
-package me.zinch.commands;
-
-import me.zinch.exceptions.CommandActionException;
-import me.zinch.wrapper.ProductCollection;
+package me.zinch.Lab6.Server.commands;
 
 import java.util.regex.Pattern;
 
@@ -40,6 +37,4 @@ public abstract class Command {
   public final boolean checkPattern(String input) {
     return pattern.matcher(input).matches();
   }
-
-  public abstract String action(ProductCollection productCollection) throws CommandActionException;
 }

Lab.Server/src/main/java/me/zinch/Lab6/Server/commands/CommandManager.java

@@ -1,4 +1,4 @@
-package me.zinch.commands;
+package me.zinch.Lab6.Server.commands;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -10,6 +10,27 @@ import java.util.Optional;
 public class CommandManager {
   private static final List<Command> commandList = new ArrayList<>();
 
+  static {
+    registerCommand(new Show());
+    registerCommand(new Exit());
+    registerCommand(new Info());
+    registerCommand(new Clear());
+    registerCommand(new PrintAscending());
+    registerCommand(new PrintUniqueManufactureCost());
+    registerCommand(new FilterContainsName());
+    registerCommand(new Add());
+    registerCommand(new IsIdExists());
+    registerCommand(new Update());
+    registerCommand(new Remove());
+    registerCommand(new AddIfMax());
+    registerCommand(new AddIfMin());
+    registerCommand(new RemoveLower());
+    registerCommand(new Save());
+    registerCommand(new GetProduct());
+
+    registerCommand(new Help());
+  }
+
   public static void registerCommand(Command command) {
     commandList.add(command);
   }
@@ -24,24 +45,4 @@ public class CommandManager {
   public static Optional<Command> getCommandByInput(String input) {
     return commandList.stream().filter(command -> command.checkPattern(input)).findFirst();
   }
-
-  static {
-    registerCommand(new Show());
-    registerCommand(new Exit());
-    registerCommand(new Info());
-    registerCommand(new Clear());
-    registerCommand(new PrintAscending());
-    registerCommand(new PrintUniqueManufactureCost());
-    registerCommand(new FilterContainsName());
-    registerCommand(new Add());
-    registerCommand(new Update());
-    registerCommand(new Remove());
-    registerCommand(new AddIfMax());
-    registerCommand(new AddIfMin());
-    registerCommand(new RemoveLower());
-    registerCommand(new Save());
-    registerCommand(new ExecuteScript());
-
-    registerCommand(new Help());
-  }
 }

Lab.Server/src/main/java/me/zinch/Lab6/Server/commands/Exit.java

@@ -0,0 +1,19 @@
+package me.zinch.Lab6.Server.commands;
+
+import me.zinch.Lab6.Domain.wrapper.IStorage;
+import me.zinch.Lab6.Server.console.Console;
+
+/**
+ * A command to exit the program without saving to a file.
+ */
+public class Exit extends GetCommand {
+  public Exit() {
+    super("exit", "terminate the program (without saving to a file)");
+  }
+
+  @Override
+  public String action(IStorage productCollection) {
+    Console.stopApp();
+    return "";
+  }
+}

Lab.Server/src/main/java/me/zinch/Lab6/Server/commands/FilterContainsName.java

@@ -0,0 +1,21 @@
+package me.zinch.Lab6.Server.commands;
+
+import me.zinch.Lab6.Domain.wrapper.IStorage;
+
+import java.util.regex.Pattern;
+
+/**
+ * A command to filter elements whose 'name' field contains the specified substring.
+ */
+public class FilterContainsName extends PostCommand {
+  public FilterContainsName() {
+    super("filter_contains_name name", "вывести элементы, значение поля name которых содержит заданную подстроку", Pattern.compile("^filter_contains_name .+"));
+  }
+
+  @Override
+  public String action(IStorage productCollection, Object object) {
+    String name = object.toString();
+    var result = productCollection.filterContainsName(name);
+    return result.isEmpty() ? "Таких элементов не найдено" : result;
+  }
+}

Lab.Server/src/main/java/me/zinch/Lab6/Server/commands/GetCommand.java

@@ -0,0 +1,18 @@
+package me.zinch.Lab6.Server.commands;
+
+import me.zinch.Lab6.Domain.wrapper.IStorage;
+import me.zinch.Lab6.Server.exceptions.CommandActionException;
+
+import java.util.regex.Pattern;
+
+public abstract class GetCommand extends Command {
+  public GetCommand(String name, String description, Pattern pattern) {
+    super(name, description, pattern);
+  }
+
+  public GetCommand(String name, String description) {
+    super(name, description);
+  }
+
+  public abstract String action(IStorage productCollection) throws CommandActionException;
+}

Lab.Server/src/main/java/me/zinch/Lab6/Server/commands/GetProduct.java

@@ -0,0 +1,19 @@
+package me.zinch.Lab6.Server.commands;
+
+import me.zinch.Lab6.Domain.wrapper.IStorage;
+import me.zinch.Lab6.Server.exceptions.CommandActionException;
+
+import java.util.regex.Pattern;
+
+public class GetProduct extends PostCommand {
+  public GetProduct() {
+    super("get_product_by_id", "", Pattern.compile("^get_product_by_id +."));
+  }
+
+  @Override
+  public String action(IStorage productCollection, Object obj) throws CommandActionException {
+    if (!productCollection.isProductIdExists((Long) obj))
+      throw new CommandActionException("Продукт с таким ID не существует");
+    return productCollection.getProductById((Long) obj).toString();
+  }
+}

Lab.Server/src/main/java/me/zinch/Lab6/Server/commands/Help.java

@@ -0,0 +1,17 @@
+package me.zinch.Lab6.Server.commands;
+
+import me.zinch.Lab6.Domain.wrapper.IStorage;
+
+/**
+ * A command to display help for available commands.
+ */
+public class Help extends GetCommand {
+  public Help() {
+    super("help", "display help for available commands");
+  }
+
+  @Override
+  public String action(IStorage productCollection) {
+    return SystemCommandManager.getRegisteredCommand();
+  }
+}

Lab.Server/src/main/java/me/zinch/Lab6/Server/commands/Info.java

@@ -1,17 +1,17 @@
-package me.zinch.commands;
+package me.zinch.Lab6.Server.commands;
 
-import me.zinch.wrapper.ProductCollection;
+import me.zinch.Lab6.Domain.wrapper.IStorage;
 
 /**
  * A command to display information about the collection (type, initialization date, number of elements, etc.) to the standard output stream.
  */
-public class Info extends Command {
+public class Info extends GetCommand {
   public Info() {
     super("info", "вывести в стандартный поток вывода информацию о коллекции (тип, дата инициализации, количество элементов и т.д.)");
   }
 
   @Override
-  public String action(ProductCollection productCollection) {
+  public String action(IStorage productCollection) {
     return productCollection.getInfo();
   }
 }

Lab.Server/src/main/java/me/zinch/Lab6/Server/commands/IsIdExists.java

@@ -0,0 +1,19 @@
+package me.zinch.Lab6.Server.commands;
+
+import me.zinch.Lab6.Domain.wrapper.IStorage;
+import me.zinch.Lab6.Server.exceptions.CommandActionException;
+
+import java.util.regex.Pattern;
+
+public class IsIdExists extends PostCommand {
+  public IsIdExists() {
+    super("is_id_exists", "", Pattern.compile("^is_id_exists +."));
+  }
+
+  @Override
+  public String action(IStorage productCollection, Object obj) throws CommandActionException {
+    if (!productCollection.isProductIdExists((Long) obj))
+      throw new CommandActionException("Продукт с таким ID не существует");
+    return "Exists";
+  }
+}

Lab.Server/src/main/java/me/zinch/Lab6/Server/commands/PostCommand.java

@@ -0,0 +1,18 @@
+package me.zinch.Lab6.Server.commands;
+
+import me.zinch.Lab6.Domain.wrapper.IStorage;
+import me.zinch.Lab6.Server.exceptions.CommandActionException;
+
+import java.util.regex.Pattern;
+
+public abstract class PostCommand extends Command {
+  public PostCommand(String name, String description, Pattern pattern) {
+    super(name, description, pattern);
+  }
+
+  public PostCommand(String name, String description) {
+    super(name, description);
+  }
+
+  public abstract String action(IStorage productCollection, Object obj) throws CommandActionException;
+}

Lab.Server/src/main/java/me/zinch/Lab6/Server/commands/PrintAscending.java

@@ -0,0 +1,18 @@
+package me.zinch.Lab6.Server.commands;
+
+import me.zinch.Lab6.Domain.wrapper.IStorage;
+
+/**
+ * A command to print the elements of the collection in ascending order.
+ */
+public class PrintAscending extends GetCommand {
+  public PrintAscending() {
+    super("print_ascending", "вывести элементы коллекции в порядке возрастания");
+  }
+
+  @Override
+  public String action(IStorage productCollection) {
+    var result = productCollection.toString();
+    return result.isEmpty() ? "Коллекция пуста" : result;
+  }
+}

Lab.Server/src/main/java/me/zinch/Lab6/Server/commands/PrintUniqueManufactureCost.java

@@ -1,17 +1,18 @@
-package me.zinch.commands;
+package me.zinch.Lab6.Server.commands;
 
-import me.zinch.wrapper.ProductCollection;
+import me.zinch.Lab6.Domain.wrapper.IStorage;
 
 /**
  * A command to print the unique values of the 'manufactureCost' field of all elements in the collection.
  */
-public class PrintUniqueManufactureCost extends Command {
+public class PrintUniqueManufactureCost extends GetCommand {
   public PrintUniqueManufactureCost() {
     super("print_unique_manufacture_cost", "вывести уникальные значения поля manufactureCost всех элементов в коллекции");
   }
 
   @Override
-  public String action(ProductCollection productCollection) {
-   return productCollection.getUniqueManufactureCost();
+  public String action(IStorage productCollection) {
+    var result = productCollection.getUniqueManufactureCost();
+    return result.isEmpty() ? "Коллекция пуста" : result;
   }
 }

Lab.Server/src/main/java/me/zinch/Lab6/Server/commands/Remove.java

@@ -0,0 +1,29 @@
+package me.zinch.Lab6.Server.commands;
+
+import me.zinch.Lab6.Domain.wrapper.IStorage;
+import me.zinch.Lab6.Server.exceptions.CommandActionException;
+
+import java.util.regex.Pattern;
+
+/**
+ * A command to remove an element from the collection by its id.
+ */
+public class Remove extends PostCommand {
+  public Remove() {
+    super("remove_by_id id", "удалить элемент из коллекции по его id", Pattern.compile("^remove_by_id .+"));
+  }
+
+  @Override
+  public String action(IStorage productCollection, Object object) throws CommandActionException {
+    try {
+      Long id = (Long) object;
+      if (productCollection.isProductIdExists(id)) {
+        var product = productCollection.removeProduct(id);
+        return String.format("Продукт %s был удалён", product.getName());
+      }
+      return "Продукта с таким id не существует";
+    } catch (NumberFormatException e) {
+      return "Неверный аргумент, id может быть только число";
+    }
+  }
+}

Lab.Server/src/main/java/me/zinch/Lab6/Server/commands/RemoveLower.java

@@ -0,0 +1,25 @@
+package me.zinch.Lab6.Server.commands;
+
+import me.zinch.Lab6.Domain.wrapper.IStorage;
+
+import java.util.regex.Pattern;
+
+/**
+ * A command to remove all elements from the collection that have ids lower than the specified id.
+ */
+public class RemoveLower extends PostCommand {
+  public RemoveLower() {
+    super("remove_lower id", "удалить из коллекции все элементы, меньшие, чем заданный по id", Pattern.compile("^remove_lower .+"));
+  }
+
+  @Override
+  public String action(IStorage productCollection, Object object) {
+    try {
+      Long id = (Long) object;
+      var size = productCollection.removeLover(id);
+      return String.format("Было удалено %d продуктов", size);
+    } catch (NumberFormatException e) {
+      return "Неверный аргумент, id может быть только число";
+    }
+  }
+}

Lab.Server/src/main/java/me/zinch/Lab6/Server/commands/Save.java

@@ -1,21 +1,21 @@
-package me.zinch.commands;
+package me.zinch.Lab6.Server.commands;
 
-import me.zinch.exceptions.CommandActionException;
-import me.zinch.files.DbController;
-import me.zinch.wrapper.ProductCollection;
+import me.zinch.Lab6.Domain.wrapper.IStorage;
+import me.zinch.Lab6.Server.exceptions.CommandActionException;
+import me.zinch.Lab6.Server.files.DbController;
 
 import java.io.IOException;
 
 /**
  * A command to save the collection to a file.
  */
-public class Save extends Command {
+public class Save extends GetCommand {
   public Save() {
     super("save", "сохранить коллекцию в файл");
   }
 
   @Override
-  public String action(ProductCollection productCollection) throws CommandActionException {
+  public String action(IStorage productCollection) throws CommandActionException {
     try {
       DbController.saveDb(productCollection.toList());
       return "Коллекция была сохранена";

Lab.Server/src/main/java/me/zinch/Lab6/Server/commands/Show.java

@@ -0,0 +1,18 @@
+package me.zinch.Lab6.Server.commands;
+
+import me.zinch.Lab6.Domain.wrapper.IStorage;
+
+/**
+ * A command to display all elements of the collection in string representation to the standard output stream.
+ */
+public class Show extends GetCommand {
+  public Show() {
+    super("show", "вывести в стандартный поток вывода все элементы коллекции в строковом представлении");
+  }
+
+  @Override
+  public String action(IStorage productCollection) {
+    var result = productCollection.toString();
+    return result.isEmpty() ? "Коллекция пуста" : result;
+  }
+}

Lab.Server/src/main/java/me/zinch/Lab6/Server/commands/SystemCommandManager.java

@@ -0,0 +1,34 @@
+package me.zinch.Lab6.Server.commands;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+
+/**
+ * Manages the registration and retrieval of commands.
+ */
+public class SystemCommandManager {
+  private static final List<Command> commandList = new ArrayList<>();
+
+  static {
+    registerCommand(new Exit());
+    registerCommand(new Save());
+
+    registerCommand(new Help());
+  }
+
+  public static void registerCommand(Command command) {
+    commandList.add(command);
+  }
+
+  public static String getRegisteredCommand() {
+    return String.join("\n", commandList
+            .stream()
+            .map(command -> String.format("%s - %s", command.getName(), command.getDescription()))
+            .toList());
+  }
+
+  public static Optional<Command> getCommandByInput(String input) {
+    return commandList.stream().filter(command -> command.checkPattern(input)).findFirst();
+  }
+}

Lab.Server/src/main/java/me/zinch/Lab6/Server/commands/UnknownCommand.java

@@ -0,0 +1,17 @@
+package me.zinch.Lab6.Server.commands;
+
+import me.zinch.Lab6.Domain.wrapper.IStorage;
+
+/**
+ * Represents an unknown command.
+ */
+public class UnknownCommand extends GetCommand {
+  public UnknownCommand() {
+    super("", "");
+  }
+
+  @Override
+  public String action(IStorage productCollection) {
+    return "Команда не распознана.";
+  }
+}

Lab.Server/src/main/java/me/zinch/Lab6/Server/commands/Update.java

@@ -0,0 +1,40 @@
+package me.zinch.Lab6.Server.commands;
+
+import me.zinch.Lab6.Domain.dto.MessageBody;
+import me.zinch.Lab6.Domain.exceptions.ValidationException;
+import me.zinch.Lab6.Domain.models.ProductDTO;
+import me.zinch.Lab6.Domain.validator.Validators;
+import me.zinch.Lab6.Domain.wrapper.IStorage;
+import me.zinch.Lab6.Server.exceptions.CommandActionException;
+
+import java.util.regex.Pattern;
+
+/**
+ * A command to update the value of an element in the collection, whose id is specified.
+ */
+public class Update extends PostCommand {
+  public Update() {
+    super("update id {element}", "обновить значение элемента коллекции, id которого равен заданному", Pattern.compile("^update .+"));
+  }
+
+  @Override
+  public String action(IStorage productCollection, Object object) throws CommandActionException {
+    try {
+      var body = (MessageBody) object;
+      var id = Long.parseLong(body.getCommand().split(" ")[1]);
+      if (productCollection.isProductIdExists(id)) {
+        var productDTO = (ProductDTO) body.getBody();
+        try {
+          Validators.validateObject(productDTO).throwIfNotValid();
+          var product = productCollection.updateProduct(id, productDTO);
+          return String.format("Продукт %s был изменён", product.getName());
+        } catch (ValidationException e) {
+          throw new CommandActionException(e.getMessage());
+        }
+      }
+      return "Продукта с таким id не существует";
+    } catch (NumberFormatException e) {
+      return "Неверный аргумент, id может быть только число";
+    }
+  }
+}

Lab.Server/src/main/java/me/zinch/Lab6/Server/configs/ServerConfig.java

@@ -0,0 +1,24 @@
+package me.zinch.Lab6.Server.configs;
+
+import me.zinch.Lab6.Domain.wrapper.IStorage;
+
+public class ServerConfig {
+  private Integer port;
+  private IStorage collection;
+
+  public Integer getPort() {
+    return port;
+  }
+
+  public void setPort(Integer port) {
+    this.port = port;
+  }
+
+  public IStorage getCollection() {
+    return collection;
+  }
+
+  public void setCollection(IStorage collection) {
+    this.collection = collection;
+  }
+}

Lab.Server/src/main/java/me/zinch/Lab6/Server/console/Console.java

@@ -0,0 +1,86 @@
+package me.zinch.Lab6.Server.console;
+
+import me.zinch.Lab6.Domain.exceptions.ValidationException;
+import me.zinch.Lab6.Domain.wrapper.IStorage;
+import me.zinch.Lab6.Server.ServerBuilder;
+import me.zinch.Lab6.Server.commands.GetCommand;
+import me.zinch.Lab6.Server.commands.SystemCommandManager;
+import me.zinch.Lab6.Server.exceptions.CommandActionException;
+import me.zinch.Lab6.Server.files.DbController;
+import me.zinch.Lab6.Server.wrapper.ProductCollection;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.util.NoSuchElementException;
+import java.util.Scanner;
+
+/**
+ * Console class provides methods for interacting with the console, reading user input, and managing application flow.
+ * This class includes methods for appending input history, stopping the application, reading product DTO from the console, and running the application loop.
+ */
+public class Console {
+  private static final Scanner scanner = new Scanner(System.in);
+  private static final Logger log = LoggerFactory.getLogger(Console.class);
+  private static boolean isRunning = true;
+  private static boolean isExitMessageShowed = false;
+  private static IStorage collection;
+
+  public static void stopApp() {
+    showExitMessage();
+    isRunning = false;
+    System.exit(0);
+  }
+
+  public static void showExitMessage() {
+    if (!isExitMessageShowed) log.info("Have a nice day!");
+    isExitMessageShowed = true;
+  }
+
+  public static void run() throws IOException, ValidationException {
+    collection = new ProductCollection(DbController.loadDb());
+
+    var server = new ServerBuilder()
+            .setPort(3000)
+            .setCollection(collection)
+            .build();
+
+    Console.handleInput();
+
+    server.run();
+
+    Runtime.getRuntime().addShutdownHook(new Thread(() -> {
+      Console.stopApp();
+      try {
+        server.stop();
+      } catch (IOException e) {
+        throw new RuntimeException(e);
+      }
+    }));
+  }
+
+  public static void handleInput() {
+    new Thread(() -> {
+      while (isRunning) {
+        try {
+          var input = scanner.nextLine().trim();
+          var command = SystemCommandManager.getCommandByInput(input);
+
+          if (command.isPresent()) {
+            var action = (GetCommand) command.get();
+            try {
+              log.info(action.action(collection));
+            } catch (CommandActionException e) {
+              log.info(e.getMessage());
+            }
+          } else {
+            log.info("This command does not exist. Write help to see a list of available commands.");
+          }
+        } catch (NoSuchElementException e) {
+          stopApp();
+        }
+      }
+      scanner.close();
+    }).start();
+  }
+}

Lab.Server/src/main/java/me/zinch/Lab6/Server/console/ShutdownHook.java

@@ -1,10 +1,10 @@
-package me.zinch.console;
+package me.zinch.Lab6.Server.console;
 
 /**
  * Represents a shutdown hook that is executed when the application is stopped.
  */
 public class ShutdownHook extends Thread {
   public ShutdownHook() {
-    super(new Thread(Console::stopApp));
+    super();
   }
 }

Lab.Server/src/main/java/me/zinch/Lab6/Server/exceptions/ColorFormatException.java

@@ -0,0 +1,11 @@
+package me.zinch.Lab6.Server.exceptions;
+
+public class ColorFormatException extends IllegalArgumentException {
+  public ColorFormatException() {
+    super();
+  }
+
+  public ColorFormatException(String message) {
+    super(message);
+  }
+}

Lab.Server/src/main/java/me/zinch/Lab6/Server/exceptions/CommandActionException.java

@@ -0,0 +1,18 @@
+package me.zinch.Lab6.Server.exceptions;
+
+/**
+ * Represents an exception that occurs during the execution of a command action.
+ */
+public class CommandActionException extends RuntimeException {
+  public CommandActionException() {
+    super("Ошибка во время выполнения команды");
+  }
+
+  public CommandActionException(String message) {
+    super(message);
+  }
+
+  public CommandActionException(Throwable e) {
+    super(e);
+  }
+}

Lab.Server/src/main/java/me/zinch/Lab6/Server/exceptions/DbInitializationException.java

@@ -0,0 +1,16 @@
+package me.zinch.Lab6.Server.exceptions;
+
+import java.io.IOException;
+
+/**
+ * Represents an exception that occurs when the database initialization fails.
+ */
+public class DbInitializationException extends IOException {
+  public DbInitializationException() {
+    super("Ошибка! Не удалось инициализировать БД. Проверьте, что структура БД верна.");
+  }
+
+  public DbInitializationException(String message) {
+    super(message);
+  }
+}

Lab.Server/src/main/java/me/zinch/Lab6/Server/exceptions/IllegalProductDtoException.java

@@ -0,0 +1,18 @@
+package me.zinch.Lab6.Server.exceptions;
+
+/**
+ * Represents an exception that occurs when an illegal product DTO is encountered during the creation or modification of a product.
+ */
+public class IllegalProductDtoException extends CommandActionException {
+  public IllegalProductDtoException() {
+    super("Ошибка при создании или изменении продукта. Были введены некорректные значения.");
+  }
+
+  public IllegalProductDtoException(String message) {
+    super(message);
+  }
+
+  public IllegalProductDtoException(Throwable e) {
+    super(e);
+  }
+}

Lab.Server/src/main/java/me/zinch/Lab6/Server/exceptions/UnitOfMeasureFormatException.java

@@ -0,0 +1,11 @@
+package me.zinch.Lab6.Server.exceptions;
+
+public class UnitOfMeasureFormatException extends IllegalArgumentException {
+  public UnitOfMeasureFormatException() {
+    super();
+  }
+
+  public UnitOfMeasureFormatException(String message) {
+    super(message);
+  }
+}

Lab.Server/src/main/java/me/zinch/Lab6/Server/files/CsvController.java

@@ -0,0 +1,80 @@
+package me.zinch.Lab6.Server.files;
+
+import com.opencsv.CSVReader;
+import com.opencsv.CSVWriter;
+import com.opencsv.exceptions.CsvValidationException;
+import me.zinch.Lab6.Domain.models.Coordinates;
+import me.zinch.Lab6.Domain.models.Dragon;
+import me.zinch.Lab6.Domain.models.DragonCharacter;
+import me.zinch.Lab6.Domain.models.DragonHead;
+import me.zinch.Lab6.Domain.models.DragonType;
+
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+import java.util.ArrayList;
+import java.util.List;
+
+public class CsvController {
+    private static final String[] HEADERS = {
+        "id", "name", "coordinates_x", "coordinates_y", "creation_date",
+        "age", "weight", "type", "character", "head_size"
+    };
+    private static final DateTimeFormatter DATE_FORMATTER = DateTimeFormatter.ISO_LOCAL_DATE_TIME;
+
+    public static List<Dragon> loadFromCsv(String filename) throws IOException {
+        List<Dragon> dragons = new ArrayList<>();
+        try (CSVReader reader = new CSVReader(new FileReader(filename))) {
+            // Skip headers
+            reader.readNext();
+            
+            String[] line;
+            while ((line = reader.readNext()) != null) {
+                dragons.add(parseDragon(line));
+            }
+        } catch (CsvValidationException e) {
+            throw new IOException("Error reading CSV file: " + e.getMessage());
+        }
+        return dragons;
+    }
+
+    public static void saveToCsv(List<Dragon> dragons, String filename) throws IOException {
+        try (CSVWriter writer = new CSVWriter(new FileWriter(filename))) {
+            writer.writeNext(HEADERS);
+            
+            for (Dragon dragon : dragons) {
+                writer.writeNext(new String[]{
+                    String.valueOf(dragon.getId()),
+                    dragon.getName(),
+                    String.valueOf(dragon.getCoordinates().getX()),
+                    String.valueOf(dragon.getCoordinates().getY()),
+                    dragon.getCreationDate().format(DATE_FORMATTER),
+                    String.valueOf(dragon.getAge()),
+                    String.valueOf(dragon.getWeight()),
+                    dragon.getType().name(),
+                    dragon.getCharacter().name(),
+                    dragon.getHead() != null ? String.valueOf(dragon.getHead().getSize()) : ""
+                });
+            }
+        }
+    }
+
+    private static Dragon parseDragon(String[] fields) {
+        return new Dragon(
+            Integer.parseInt(fields[0]),
+            fields[1],
+            new Coordinates(
+                Long.parseLong(fields[2]),
+                Integer.parseInt(fields[3])
+            ),
+            LocalDateTime.parse(fields[4], DATE_FORMATTER),
+            Integer.parseInt(fields[5]),
+            Long.parseLong(fields[6]),
+            DragonType.valueOf(fields[7]),
+            DragonCharacter.valueOf(fields[8]),
+            fields[9].isEmpty() ? null : new DragonHead(Float.parseFloat(fields[9]))
+        );
+    }
+} 

Lab.Server/src/main/java/me/zinch/Lab6/Server/files/DbController.java

@@ -1,20 +1,18 @@
-package me.zinch.files;
+package me.zinch.Lab6.Server.files;
 
 import com.fasterxml.jackson.annotation.JsonInclude;
-import com.fasterxml.jackson.databind.DatabindException;
 import com.fasterxml.jackson.dataformat.xml.XmlMapper;
 import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlElementWrapper;
 import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlProperty;
 import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
-import me.zinch.exceptions.DbInitializationException;
-import me.zinch.models.Product;
+import me.zinch.Lab6.Domain.models.Product;
 
 import java.io.BufferedInputStream;
 import java.io.FileInputStream;
-import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.OutputStreamWriter;
+import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
 
@@ -27,10 +25,32 @@ public class DbController {
 
   static {
     Map<String, String> env = System.getenv();
-    path = env.getOrDefault("DB_FILE", "");
+    path = env.getOrDefault("DB_FILE", "db.xml");
     xmlMapper.setDefaultPropertyInclusion(JsonInclude.Include.NON_NULL);
   }
 
+  public static List<Product> loadDb() {
+    try {
+      BufferedInputStream bufferedInputStream = new BufferedInputStream(new FileInputStream(path));
+      List<Product> collection = xmlMapper.readValue(bufferedInputStream, Products.class).getProducts();
+      bufferedInputStream.close();
+      if (collection == null) return new ArrayList<>();
+      return collection;
+    } catch (IOException e) {
+      return new ArrayList<>();
+    }
+  }
+
+  public static void saveDb(List<Product> list) throws IOException {
+    try {
+      OutputStreamWriter outputStreamWriter = new OutputStreamWriter(new FileOutputStream(path));
+      xmlMapper.writeValue(outputStreamWriter, new Products(list));
+      outputStreamWriter.close();
+    } catch (IOException e) {
+      throw new IOException("Не удалось записать в файл");
+    }
+  }
+
   /**
    * Represents a collection of products.
    */
@@ -39,7 +59,8 @@ public class DbController {
     @JacksonXmlProperty(localName = "Product")
     private List<Product> products;
 
-    public Products() {}
+    public Products() {
+    }
 
     public Products(List<Product> list) {
       this.products = list;
@@ -49,31 +70,4 @@ public class DbController {
       return products;
     }
   }
-
-  public static List<Product> loadDb() throws IOException {
-    try {
-      BufferedInputStream bufferedInputStream = new BufferedInputStream(new FileInputStream(path));
-      Products collection = xmlMapper.readValue(bufferedInputStream, Products.class);
-      bufferedInputStream.close();
-      return collection.getProducts();
-    } catch (FileNotFoundException e) {
-      throw new FileNotFoundException("Не удалось найти файл " + path);
-    } catch (DatabindException e) {
-      throw new DbInitializationException();
-    } catch (IOException e) {
-      throw new IOException("Произошла неожиданная ошибка во время работы с файлом!");
-    }
-  }
-
-  public static void saveDb(List<Product> list) throws IOException {
-    try {
-      OutputStreamWriter outputStreamWriter = new OutputStreamWriter(new FileOutputStream(path));
-      xmlMapper.writeValue(outputStreamWriter, new Products(list));
-      outputStreamWriter.close();
-    } catch (FileNotFoundException e) {
-      throw new FileNotFoundException(e.getMessage());
-    } catch (IOException e) {
-      throw new IOException(e);
-    }
-  }
 }

Lab.Server/src/main/java/me/zinch/Lab6/Server/files/ScriptLoader.java

@@ -0,0 +1,32 @@
+package me.zinch.Lab6.Server.files;
+
+import java.io.BufferedInputStream;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Scanner;
+
+/**
+ * The ScriptLoader class provides methods to load scripts from files.
+ */
+public class ScriptLoader {
+  public static List<String> loadList(String path) throws IOException {
+    try {
+      BufferedInputStream bufferedInputStream = new BufferedInputStream(new FileInputStream(path));
+      Scanner scanner = new Scanner(bufferedInputStream);
+      List<String> list = new ArrayList<>();
+      while (scanner.hasNextLine()) {
+        list.add(scanner.nextLine());
+      }
+      bufferedInputStream.close();
+      scanner.close();
+      return list;
+    } catch (FileNotFoundException e) {
+      throw new FileNotFoundException(String.format("Файл %s не найден.", path));
+    } catch (IOException e) {
+      throw new IOException("Произошла неожиданная ошибка во время работы с файлом!");
+    }
+  }
+}

Lab.Server/src/main/java/me/zinch/Lab6/Server/modules/CommandModule.java

@@ -0,0 +1,81 @@
+package me.zinch.Lab6.Server.modules;
+
+import me.zinch.Lab6.Domain.dto.BodylessMessage;
+import me.zinch.Lab6.Domain.dto.Message;
+import me.zinch.Lab6.Domain.dto.MessageBody;
+import me.zinch.Lab6.Domain.dto.MessageType;
+import me.zinch.Lab6.Domain.wrapper.IStorage;
+import me.zinch.Lab6.Server.commands.CommandManager;
+import me.zinch.Lab6.Server.commands.GetCommand;
+import me.zinch.Lab6.Server.commands.PostCommand;
+import me.zinch.Lab6.Server.exceptions.CommandActionException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
+import java.nio.ByteBuffer;
+
+public class CommandModule {
+    private static final Logger log = LoggerFactory.getLogger(CommandModule.class);
+    private final IStorage storage;
+
+    public CommandModule(IStorage storage) {
+        this.storage = storage;
+    }
+
+    public ByteBuffer processCommand(Message message) throws IOException {
+        return switch (message.getType()) {
+            case HELLO -> serialize(new BodylessMessage(MessageType.HELLO));
+            case GET -> handleGetCommand((String) message.getBody());
+            case POST -> handlePostCommand((MessageBody) message.getBody());
+            default -> {
+                log.error("Message type not supported");
+                yield null;
+            }
+        };
+    }
+
+    private ByteBuffer handleGetCommand(String inputCommand) throws IOException {
+        var command = CommandManager.getCommandByInput(inputCommand);
+        if (command.isEmpty()) {
+            log.error("Command {} not found", inputCommand);
+            return serialize(new BodylessMessage(MessageType.ERROR, String.format("Command %s not found", inputCommand)));
+        }
+        try {
+            var action = (GetCommand) command.get();
+            return serialize(new BodylessMessage(MessageType.OK, action.action(storage)));
+        } catch (CommandActionException e) {
+            return serialize(new BodylessMessage(MessageType.ERROR, e.getMessage()));
+        }
+    }
+
+    private ByteBuffer handlePostCommand(MessageBody request) throws IOException {
+        var inputCommand = request.getCommand();
+        var body = request.getBody();
+
+        var command = CommandManager.getCommandByInput(inputCommand);
+        if (command.isEmpty()) {
+            log.error("Command {} not found", inputCommand);
+            return serialize(new BodylessMessage(MessageType.ERROR, String.format("Command %s not found", inputCommand)));
+        }
+
+        try {
+            var action = (PostCommand) command.get();
+            return serialize(new BodylessMessage(MessageType.OK, action.action(storage, body)));
+        } catch (CommandActionException e) {
+            return serialize(new BodylessMessage(MessageType.ERROR, e.getMessage()));
+        }
+    }
+
+    private static ByteBuffer serialize(Serializable obj) throws IOException {
+        try (var bOut = new ByteArrayOutputStream();
+             var oOut = new ObjectOutputStream(bOut)) {
+            oOut.writeObject(obj);
+            oOut.flush();
+            return ByteBuffer.wrap(bOut.toByteArray());
+        }
+    }
+} 

Lab.Server/src/main/java/me/zinch/Lab6/Server/modules/ConnectionModule.java

@@ -0,0 +1,40 @@
+package me.zinch.Lab6.Server.modules;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.nio.channels.SelectionKey;
+import java.nio.channels.Selector;
+import java.nio.channels.ServerSocketChannel;
+import java.nio.channels.SocketChannel;
+
+public class ConnectionModule {
+    private static final Logger log = LoggerFactory.getLogger(ConnectionModule.class);
+    private final ServerSocketChannel serverSocketChannel;
+    private final Selector selector;
+
+    public ConnectionModule(int port, Selector selector) throws IOException {
+        this.selector = selector;
+        serverSocketChannel = ServerSocketChannel.open();
+        serverSocketChannel.bind(new InetSocketAddress(port));
+        serverSocketChannel.configureBlocking(false);
+        serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT);
+        log.info("Connection module initialized on port {}", port);
+    }
+
+    public void handleAccept(SelectionKey key) throws IOException {
+        var server = (ServerSocketChannel) key.channel();
+        var client = server.accept();
+        if (client != null) {
+            client.configureBlocking(false);
+            client.register(selector, SelectionKey.OP_READ);
+            log.info("Accepted connection from {}", client.getRemoteAddress());
+        }
+    }
+
+    public void close() throws IOException {
+        serverSocketChannel.close();
+    }
+} 

Lab.Server/src/main/java/me/zinch/Lab6/Server/modules/RequestModule.java

@@ -0,0 +1,41 @@
+package me.zinch.Lab6.Server.modules;
+
+import me.zinch.Lab6.Domain.dto.Message;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.nio.ByteBuffer;
+import java.nio.channels.SelectionKey;
+import java.nio.channels.SocketChannel;
+import java.util.Map;
+
+public class RequestModule {
+    private static final Logger log = LoggerFactory.getLogger(RequestModule.class);
+    private final Map<SocketChannel, Message> clientMessages;
+
+    public RequestModule(Map<SocketChannel, Message> clientMessages) {
+        this.clientMessages = clientMessages;
+    }
+
+    public void handleRead(SelectionKey key) throws IOException, ClassNotFoundException {
+        var client = (SocketChannel) key.channel();
+        var buffer = ByteBuffer.allocate(8192);
+        int bytesRead = client.read(buffer);
+        
+        if (bytesRead == -1) {
+            client.close();
+            return;
+        }
+
+        buffer.flip();
+        try (var oIn = new ObjectInputStream(new ByteArrayInputStream(buffer.array()))) {
+            var msg = (Message) oIn.readObject();
+            log.info("Received message {} from {}", msg, client.getRemoteAddress());
+            clientMessages.put(client, msg);
+            client.register(key.selector(), SelectionKey.OP_WRITE);
+        }
+    }
+} 

Lab.Server/src/main/java/me/zinch/Lab6/Server/modules/ResponseModule.java

@@ -0,0 +1,42 @@
+package me.zinch.Lab6.Server.modules;
+
+import me.zinch.Lab6.Domain.dto.Message;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.channels.SelectionKey;
+import java.nio.channels.SocketChannel;
+import java.util.Map;
+
+public class ResponseModule {
+    private static final Logger log = LoggerFactory.getLogger(ResponseModule.class);
+    private final Map<SocketChannel, Message> clientMessages;
+    private final CommandModule commandModule;
+
+    public ResponseModule(Map<SocketChannel, Message> clientMessages, CommandModule commandModule) {
+        this.clientMessages = clientMessages;
+        this.commandModule = commandModule;
+    }
+
+    public void handleWrite(SelectionKey key) throws IOException {
+        var client = (SocketChannel) key.channel();
+        var message = clientMessages.get(client);
+        
+        if (message == null) {
+            log.error("Message for {} not found", client.getRemoteAddress());
+            client.close();
+            return;
+        }
+
+        ByteBuffer responseBuffer = commandModule.processCommand(message);
+        if (responseBuffer != null) {
+            client.write(responseBuffer);
+            log.info("Sent response to {}", client.getRemoteAddress());
+        }
+
+        clientMessages.remove(client);
+        client.close();
+    }
+} 

Lab.Server/src/main/java/me/zinch/Lab6/Server/wrapper/DragonCollection.java

@@ -0,0 +1,123 @@
+package me.zinch.Lab6.Server.wrapper;
+
+import me.zinch.Lab6.Domain.exceptions.ValidationException;
+import me.zinch.Lab6.Domain.models.Dragon;
+import me.zinch.Lab6.Domain.models.DragonCharacter;
+import me.zinch.Lab6.Domain.models.DragonType;
+import me.zinch.Lab6.Domain.wrapper.IStorage;
+
+import java.time.LocalDateTime;
+import java.util.Comparator;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.stream.Collectors;
+
+public class DragonCollection implements IStorage {
+    private final LinkedList<Dragon> dragons;
+    private Integer idIncrementor;
+
+    public DragonCollection(List<Dragon> list) throws ValidationException {
+        dragons = new LinkedList<>(list);
+        idIncrementor = dragons.stream()
+            .mapToInt(Dragon::getId)
+            .max()
+            .orElse(0) + 1;
+    }
+
+    private Integer generateId() {
+        return idIncrementor++;
+    }
+
+    public Dragon getDragonById(Integer id) {
+        return dragons.stream()
+            .filter(d -> Objects.equals(d.getId(), id))
+            .findFirst()
+            .orElse(null);
+    }
+
+    public Dragon addDragon(Dragon dragon) {
+        dragons.add(dragon);
+        return dragon;
+    }
+
+    public Dragon updateDragon(Integer id, Dragon newDragon) {
+        var index = dragons.indexOf(getDragonById(id));
+        if (index != -1) {
+            dragons.set(index, newDragon);
+        }
+        return newDragon;
+    }
+
+    public Dragon removeDragon(Integer id) {
+        var dragon = getDragonById(id);
+        dragons.remove(dragon);
+        return dragon;
+    }
+
+    public String getInfo() {
+        var initDate = dragons.stream()
+            .map(Dragon::getCreationDate)
+            .min(Comparator.naturalOrder())
+            .orElse(LocalDateTime.MIN);
+        return String.format("Type: LinkedList%nInitialization date: %s%nNumber of elements: %s", 
+            initDate, dragons.size());
+    }
+
+    public void clear() {
+        dragons.clear();
+    }
+
+    public Dragon getHead() {
+        return dragons.isEmpty() ? null : dragons.getFirst();
+    }
+
+    public Dragon removeHead() {
+        return dragons.isEmpty() ? null : dragons.removeFirst();
+    }
+
+    public Dragon getMaxByWeight() {
+        return dragons.stream()
+            .max(Comparator.comparingLong(Dragon::getWeight))
+            .orElse(null);
+    }
+
+    public Map<DragonType, Long> groupCountingByType() {
+        return dragons.stream()
+            .collect(Collectors.groupingBy(
+                Dragon::getType,
+                Collectors.counting()
+            ));
+    }
+
+    public List<Dragon> filterLessThanCharacter(DragonCharacter character) {
+        return dragons.stream()
+            .filter(d -> d.getCharacter().compareTo(character) < 0)
+            .collect(Collectors.toList());
+    }
+
+    public List<Dragon> toList() {
+        return new LinkedList<>(dragons);
+    }
+
+    @Override
+    public String toString() {
+        return dragons.stream()
+            .map(Dragon::toString)
+            .collect(Collectors.joining("\n"));
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        DragonCollection that = (DragonCollection) o;
+        return Objects.equals(dragons, that.dragons) && Objects.equals(idIncrementor, that.idIncrementor);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(dragons, idIncrementor);
+    }
+} 

Lab.Server/src/main/java/me/zinch/Lab6/Server/wrapper/ProductCollection.java

@@ -1,8 +1,9 @@
-package me.zinch.wrapper;
+package me.zinch.Lab6.Server.wrapper;
 
-import me.zinch.exceptions.ValidationException;
-import me.zinch.models.Product;
-import me.zinch.models.ProductDTO;
+import me.zinch.Lab6.Domain.exceptions.ValidationException;
+import me.zinch.Lab6.Domain.models.Product;
+import me.zinch.Lab6.Domain.models.ProductDTO;
+import me.zinch.Lab6.Domain.wrapper.IStorage;
 
 import java.time.Instant;
 import java.time.ZoneId;
@@ -17,23 +18,28 @@ import java.util.TreeSet;
 /**
  * Represents a collection of products.
  */
-public class ProductCollection {
+public class ProductCollection implements IStorage {
   private final TreeSet<Product> productList;
   private Long idIncrementor;
 
   public ProductCollection(List<Product> list) throws ValidationException {
-    productList = new TreeSet<>(Comparator.comparingLong(Product::getId));
+    productList = new TreeSet<>(Comparator.comparing(Product::getName));
     productList.addAll(list);
-    idIncrementor = productList.last().getId() + 1;
+    idIncrementor = productList.stream()
+        .mapToLong(Product::getId)
+        .max()
+        .orElse(0) + 1;
   }
 
   private Long generateId() {
     return idIncrementor++;
   }
 
-  private Product getProductById(Long id) {
-    Optional<Product> product = productList.stream().filter(i -> Objects.equals(i.getId(), id)).findFirst();
-    return product.orElse(null);
+  public Product getProductById(Long id) {
+    return productList.stream()
+        .filter(p -> Objects.equals(p.getId(), id))
+        .findFirst()
+        .orElse(null);
   }
 
   public Product addProduct(ProductDTO productDTO) {
@@ -61,48 +67,62 @@ public class ProductCollection {
   }
 
   public String getInfo() {
-    var optionalInitDate = productList.stream().map(Product::getCreationDate).sorted().findFirst();
-    ZonedDateTime initDate = optionalInitDate.orElse(ZonedDateTime.ofInstant(Instant.EPOCH, ZoneId.systemDefault()));
-    return String.format("TreeSet%nInit Date: %s%nNumber of elements: %s", initDate, productList.size());
+    var initDate = productList.stream()
+        .map(Product::getCreationDate)
+        .min(Comparator.naturalOrder())
+        .orElse(ZonedDateTime.ofInstant(Instant.EPOCH, ZoneId.systemDefault()));
+    return String.format("Type: TreeSet%nInitialization date: %s%nNumber of elements: %s", 
+        initDate, productList.size());
   }
 
   public void clear() {
     productList.clear();
   }
 
-
   public Long getMaxPrice() {
-    return productList.stream().max(Comparator.comparingLong(Product::getPrice)).map(Product::getPrice).orElse(null);
+    return productList.stream()
+        .mapToLong(Product::getPrice)
+        .max()
+        .orElse(0);
   }
 
   public Long getMinPrice() {
-    return productList.stream().min(Comparator.comparingLong(Product::getPrice)).map(Product::getPrice).orElse(null);
+    return productList.stream()
+        .mapToLong(Product::getPrice)
+        .min()
+        .orElse(0);
   }
 
   public boolean isProductIdExists(Long id) {
-    return getProductById(id) != null;
+    return productList.stream()
+        .anyMatch(p -> Objects.equals(p.getId(), id));
   }
 
   public Integer removeLover(Long id) {
     var size = productList.size();
-    productList.headSet(getProductById(id)).stream().toList().forEach(productList::remove);
+    var targetProduct = getProductById(id);
+    productList.stream()
+        .filter(p -> p.compareTo(targetProduct) < 0)
+        .toList()
+        .forEach(productList::remove);
     return size - productList.size();
   }
 
   public String filterContainsName(String name) {
-    return String.join("\n", productList.stream()
-            .filter(product -> product.getName().toLowerCase().contains(name.toLowerCase()))
-            .map(Product::toString)
-            .toList());
+    return productList.stream()
+        .filter(product -> product.getName().toLowerCase().contains(name.toLowerCase()))
+        .map(Product::toString)
+        .reduce((a, b) -> a + "\n" + b)
+        .orElse("");
   }
 
   public String getUniqueManufactureCost() {
-    return String.join(", ", Set.copyOf(productList.stream()
-            .map(Product::getManufactureCost)
-            .toList())
-            .stream()
-            .map(Object::toString)
-            .toList());
+    return productList.stream()
+        .map(Product::getManufactureCost)
+        .distinct()
+        .map(Object::toString)
+        .reduce((a, b) -> a + ", " + b)
+        .orElse("");
   }
 
   public List<Product> toList() {
@@ -111,7 +131,10 @@ public class ProductCollection {
 
   @Override
   public String toString() {
-    return String.join("\n", productList.stream().map(Product::toString).toList());
+    return productList.stream()
+        .map(Product::toString)
+        .reduce((a, b) -> a + "\n" + b)
+        .orElse("");
   }
 
   @Override

Lab.Server/src/main/resources/logback.xml

@@ -0,0 +1,11 @@
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="info">
+        <appender-ref ref="STDOUT"/>
+    </root>
+</configuration>