Commit 22286ac1 authored by sahar.moalla's avatar sahar.moalla

ThreadSync

parent d7131a4a
target/
!.mvn/wrapper/maven-wrapper.jar
!**/src/main/**/target/
!**/src/test/**/target/
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public class PoolThreadRunnable implements Runnable {
// Declare variables
private Thread thread = null;
private SynchronizedQueue<Runnable> taskQueue = null;
private boolean isStopped = false;
// Constructor for PoolThreadRunnable class
public PoolThreadRunnable(SynchronizedQueue<Runnable> queue){
taskQueue = queue;
}
// Method to run the thread
public void run(){
// Set the current thread to the thread variable
this.thread = Thread.currentThread();
// Keep the thread running until it is stopped
while(!isStopped()){
try{
// Get the next task from the task queue and run it
Runnable runnable = (Runnable) taskQueue.take();
runnable.run();
} catch(Exception e){
// Log or otherwise report exception,
// but keep pool thread alive.
}
}
}
// Method to stop the thread
public synchronized void doStop(){
isStopped = true;
// Interrupt the thread to break it out of the dequeue() call
this.thread.interrupt();
}
// Method to check if the thread is stopped
public synchronized boolean isStopped(){
return isStopped;
}
}
import java.util.LinkedList;
import java.util.Queue;
public class SynchronizedQueue<T> {
private Queue<T> queue = new LinkedList<>();
int maxSize;
// Constructor for SynchronizedQueue class
public SynchronizedQueue(int maxSize) {
this.maxSize=maxSize;
}
// Method to add an element to the queue
public synchronized void offer(T element) {
// Wait until the queue is not full
while (maxSize == queue.size()) {
try {
wait();
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
// Add the element to the queue
queue.offer(element);
// Notify all waiting threads that an element has been added
notifyAll();
}
// Method to take an element from the queue
public synchronized T take() throws InterruptedException {
// Wait until the queue is not empty
while (queue.isEmpty()) {
wait();
}
// Remove and return the element from the queue
return queue.poll();
}
// Method to get the size of the queue
public synchronized int size() {
return queue.size();
}
}
import java.util.ArrayList;
import java.util.List;
public class ThreadPool {
// Declare variables
private SynchronizedQueue<Runnable> taskQueue = null;
private List<PoolThreadRunnable> runnables = new ArrayList<>();
private boolean isStopped = false;
// Constructor for ThreadPool class
public ThreadPool(int noOfThreads, int maxNoOfTasks){
// Initialize the task queue with the maximum number of tasks
taskQueue = new SynchronizedQueue<Runnable> (maxNoOfTasks);
// Create the specified number of threads and add them to the list of runnables
for(int i=0; i<noOfThreads; i++){
PoolThreadRunnable poolThreadRunnable =
new PoolThreadRunnable(taskQueue);
runnables.add(poolThreadRunnable);
}
// Start each thread in the list of runnables
for(PoolThreadRunnable runnable : runnables){
new Thread(runnable).start();
}
}
// Method to add a task to the task queue
public synchronized void execute(Runnable task) throws Exception{
if(this.isStopped) throw
new IllegalStateException("ThreadPool is stopped");
// Add the task to the task queue
this.taskQueue.offer(task);
}
// Method to stop all threads in the thread pool
public synchronized void stop(){
this.isStopped = true;
for(PoolThreadRunnable runnable : runnables){
runnable.doStop();
}
}
// Method to wait until all tasks in the task queue have been completed
public synchronized void waitUntilAllTasksFinished() {
while(this.taskQueue.size() > 0) {
try {
Thread.sleep(1);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
public class ThreadPoolMain {
public static void main(String[] args) throws Exception {
// Create a thread pool with 3 threads and a maximum of 10 tasks
ThreadPool threadPool = new ThreadPool(3, 10);
// Execute 10 tasks
for(int i=0; i<10; i++) {
int taskNo = i;
// Execute each task in a lambda expression
threadPool.execute( () -> {
String message =
Thread.currentThread().getName()
+ ": Task " + taskNo ;
System.out.println(message);
});
}
// Wait until all tasks in the thread pool have finished
threadPool.waitUntilAllTasksFinished();
// Stop the thread pool and its threads
threadPool.stop();
}
}
package org.example;
public class Main {
public static void main(String[] args) {
System.out.println("Hello world!");
}
}
\ No newline at end of file
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