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Threads_Synchronization/.idea/compiler.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <annotationProcessing>
+      <profile name="Maven default annotation processors profile" enabled="true">
+        <sourceOutputDir name="target/generated-sources/annotations" />
+        <sourceTestOutputDir name="target/generated-test-sources/test-annotations" />
+        <outputRelativeToContentRoot value="true" />
+        <module name="Threads_Synchronization" />
+      </profile>
+    </annotationProcessing>
+  </component>
+</project>
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Threads_Synchronization/.idea/encodings.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding">
+    <file url="file://$PROJECT_DIR$/src/main/java" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/src/main/resources" charset="UTF-8" />
+  </component>
+</project>
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Threads_Synchronization/.idea/jarRepositories.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RemoteRepositoriesConfiguration">
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Central Repository" />
+      <option name="url" value="https://repo.maven.apache.org/maven2" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Maven Central repository" />
+      <option name="url" value="https://repo1.maven.org/maven2" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="jboss.community" />
+      <option name="name" value="JBoss Community repository" />
+      <option name="url" value="https://repository.jboss.org/nexus/content/repositories/public/" />
+    </remote-repository>
+  </component>
+</project>
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Threads_Synchronization/.idea/misc.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="MavenProjectsManager">
+    <option name="originalFiles">
+      <list>
+        <option value="$PROJECT_DIR$/pom.xml" />
+      </list>
+    </option>
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>
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Threads_Synchronization/.idea/vcs.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
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Threads_Synchronization/.idea/workspace.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="AutoImportSettings">
+    <option name="autoReloadType" value="SELECTIVE" />
+  </component>
+  <component name="ChangeListManager">
+    <list default="true" id="3b1107cf-8f18-42d0-b9de-b4ed88b26b87" name="Changes" comment="" />
+    <option name="SHOW_DIALOG" value="false" />
+    <option name="HIGHLIGHT_CONFLICTS" value="true" />
+    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
+    <option name="LAST_RESOLUTION" value="IGNORE" />
+  </component>
+  <component name="FileTemplateManagerImpl">
+    <option name="RECENT_TEMPLATES">
+      <list>
+        <option value="Class" />
+      </list>
+    </option>
+  </component>
+  <component name="Git.Settings">
+    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
+  </component>
+  <component name="MarkdownSettingsMigration">
+    <option name="stateVersion" value="1" />
+  </component>
+  <component name="ProjectId" id="2YiaBVYwYrdkkXBi0IFFiTryaoB" />
+  <component name="ProjectLevelVcsManager" settingsEditedManually="true" />
+  <component name="ProjectViewState">
+    <option name="hideEmptyMiddlePackages" value="true" />
+    <option name="showLibraryContents" value="true" />
+  </component>
+  <component name="PropertiesComponent"><![CDATA[{
+  "keyToString": {
+    "RunOnceActivity.OpenProjectViewOnStart": "true",
+    "RunOnceActivity.ShowReadmeOnStart": "true",
+    "SHARE_PROJECT_CONFIGURATION_FILES": "true",
+    "last_opened_file_path": "D:/Lab4/Threads_Synchronization",
+    "project.structure.last.edited": "Problems",
+    "project.structure.proportion": "0.0",
+    "project.structure.side.proportion": "0.2"
+  }
+}]]></component>
+  <component name="SpellCheckerSettings" RuntimeDictionaries="0" Folders="0" CustomDictionaries="0" DefaultDictionary="application-level" UseSingleDictionary="true" transferred="true" />
+  <component name="TaskManager">
+    <task active="true" id="Default" summary="Default task">
+      <changelist id="3b1107cf-8f18-42d0-b9de-b4ed88b26b87" name="Changes" comment="" />
+      <created>1701010721222</created>
+      <option name="number" value="Default" />
+      <option name="presentableId" value="Default" />
+      <updated>1701010721222</updated>
+    </task>
+    <servers />
+  </component>
+  <component name="Vcs.Log.Tabs.Properties">
+    <option name="TAB_STATES">
+      <map>
+        <entry key="MAIN">
+          <value>
+            <State />
+          </value>
+        </entry>
+      </map>
+    </option>
+  </component>
+</project>
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Threads_Synchronization/pom.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         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>org.example</groupId>
+    <artifactId>Threads_Synchronization</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>8</maven.compiler.source>
+        <maven.compiler.target>8</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+</project>
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Threads_Synchronization/src/main/java/org/example/Main.java

+package org.example;
+
+public class Main {
+    public static void main(String[] args) throws Exception {
+        long timeout = 3000;
+        ThreadPool threadPool = new ThreadPool(3, 10);
+        for (int i = 0; i < 60; i++) {
+            final int taskNo = i;
+            threadPool.execute(() -> {
+                String message = Thread.currentThread().getName() + ": Task " + taskNo;
+                System.out.println(message);
+            });
+        }
+        threadPool.waitUntilAllTasksFinished(timeout);
+        threadPool.stop();
+
+
+    }
+}
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Threads_Synchronization/src/main/java/org/example/MyBlockingQueue.java

+package org.example;
+
+import java.util.LinkedList;
+import java.util.Queue;
+
+public class MyBlockingQueue<E> {
+    private Queue<E> queue;
+    private int maxNoOfTasks;
+    public MyBlockingQueue(int maxNoOfTasks) {
+        queue = new LinkedList<>();
+        this.maxNoOfTasks = maxNoOfTasks;
+    }
+    public synchronized void put(E e) throws InterruptedException {
+        while ( getQueueSize() == maxNoOfTasks) {
+            wait();
+        }
+        queue.add(e);
+        notifyAll();
+    }
+    public void setQueue(Queue<E> queue) {
+        this.queue = queue;
+    }
+    public void setMaxNoOfTasks(int maxNoOfTasks) {
+        this.maxNoOfTasks = maxNoOfTasks;
+    }
+    public Queue<E> getQueue() {
+        return queue;
+    }
+    public int getMaxNoOfTasks() {
+        return maxNoOfTasks;
+    }
+    public synchronized int getQueueSize() {
+        return queue.size();
+    }
+    public synchronized E take() throws InterruptedException {
+        while ( getQueueSize() == 0) {
+            wait();
+        }
+        E item = queue.remove();
+        notifyAll();
+        return item;
+    }
+}
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Threads_Synchronization/src/main/java/org/example/PoolThreadRunnable.java

+package org.example;
+
+public class PoolThreadRunnable implements Runnable {
+    private Thread thread = null;
+    private MyBlockingQueue<Runnable> taskQueue = null;
+    private boolean isStopped = false;
+    public PoolThreadRunnable(MyBlockingQueue<Runnable> queue) {
+        taskQueue = queue;
+    }
+    public void run() {
+        this.thread = Thread.currentThread();
+        while (!isStopped()) {
+            try {
+                Runnable runnable = taskQueue.take();
+                runnable.run();
+            } catch (Exception e) {
+            }
+        }
+    }
+    public synchronized void doStop() {
+        isStopped = true;
+        this.thread.interrupt();
+    }
+    public synchronized boolean isStopped() {
+        return isStopped;
+    }
+}
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Threads_Synchronization/src/main/java/org/example/ThreadPool.java

+package org.example;
+import java.util.ArrayList;
+import java.util.List;
+public class ThreadPool {
+    private MyBlockingQueue<Runnable> taskQueue;
+    private List<PoolThreadRunnable> runnables;
+    private boolean isStopped;
+    private int completedTasks;
+    public ThreadPool(int noOfThreads, int maxNoOfTasks) {
+        taskQueue = new MyBlockingQueue<>(maxNoOfTasks);
+        runnables = new ArrayList<>();
+        isStopped = false;
+
+
+        for (int i = 0; i < noOfThreads; i++) {
+            PoolThreadRunnable poolThreadRunnable = new PoolThreadRunnable(taskQueue);
+            runnables.add(poolThreadRunnable);
+            new Thread(poolThreadRunnable).start();
+        }
+    }
+    public synchronized void execute(Runnable task) throws Exception {
+        if (isStopped) {
+            throw new IllegalStateException("ThreadPool is stopped");
+        }
+        taskQueue.put(task);
+    }
+    public synchronized void stop() {
+        this.isStopped = true;
+        for (PoolThreadRunnable runnable : runnables) {
+            runnable.doStop();
+        }
+    }
+    public void waitUntilAllTasksFinished(long timeout ) {
+        long startTime = System.currentTimeMillis();
+        while(this.taskQueue.getQueueSize()>0) {
+            if (System.currentTimeMillis() - startTime > timeout) {
+                stop(); // Stop the ThreadPool if timeout is finished
+                break;
+            }
+            try {
+                Thread.sleep(1);
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+
+}
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