diff --git a/Concurrency/ThreadCommunication.java b/Concurrency/ThreadCommunication.java new file mode 100644 index 0000000..e9a77bb --- /dev/null +++ b/Concurrency/ThreadCommunication.java @@ -0,0 +1,108 @@ +import java.lang.Runnable; +import java.lang.Thread; +import java.util.LinkedList; + +class SharedQueue{ + private static LinkedList queue; + private Object queueLock; + + public SharedQueue(){ + queue = new LinkedList<>(); + } + + public void addElement(int element){ + synchronized(queueLock){ + queue.addLast(element); + } + } + + public int getElement(){ + int result; + synchronized(queueLock){ + result = queue.getLast(); + } + return result; + } +} + +class WriterTask implements Runnable{ + private String taskName; + private static SharedQueue sharedQueue; + private int startIndex; + + public WriterTask(String taskName, SharedQueue sharedQueue){ + this.taskName = taskName; + this.sharedQueue = sharedQueue; + this.startIndex = 1; + } + + public WriterTask(String taskName, SharedQueue sharedQueue, int startIndex){ + this.taskName = taskName; + this.sharedQueue = sharedQueue; + this.startIndex = startIndex; + } + + @Override + public void run() { + for(int job = this.startIndex; job <= this.startIndex + 100; job++){ + try{ + System.out.println("" + this.taskName + " doing job " + job); + sharedQueue.addElement(job); + System.out.flush(); + Thread.sleep(1000); + }catch(Exception exception){ + System.err.println("" + this.taskName + " error in doing job " + + job + " details: "+exception.getMessage()); + } + } + } +} + +class ReaderTask implements Runnable{ + private String taskName; + private static SharedQueue sharedQueue; + + public ReaderTask(String taskName, SharedQueue sharedQueue){ + this.taskName = taskName; + this.sharedQueue = sharedQueue; + // this.startIndex = 1; + } + + @Override + public void run() { + for(int job = 1; job <= 100; job++){ + try{ + int result = sharedQueue.getElement(); + System.out.println("" + this.taskName + " iteration: " + job +" result: "+result); + System.out.flush(); + Thread.sleep(3000); + }catch(Exception exception){ + System.err.println("" + this.taskName + " error in doing job " + job); + } + } + } +} + +class ThreadCommunication{ + public static void main(String[] args) throws Exception{ + SharedQueue sharedQueue = new SharedQueue(); + + WriterTask taskA = new WriterTask("Writer task W1", sharedQueue); + Thread firstWriterThread = new Thread(taskA); + + WriterTask taskB = new WriterTask("Writer task W2", sharedQueue, 101); + Thread secondWriterThread = new Thread(taskB); + + firstWriterThread.start(); + secondWriterThread.start(); + + ReaderTask readerTask = new ReaderTask("reader task R1 ", sharedQueue); + Thread readerThread = new Thread(readerTask); + readerThread.start(); + + readerThread.join(); + firstWriterThread.join(); + secondWriterThread.join(); + + } +} \ No newline at end of file pFad - Phonifier reborn

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