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Author: theagentd (posted 2013-11-02 23:35:02, viewed 389 times)

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package net.mokyu.threading.test;

import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.atomic.AtomicInteger;

public class SyncTest2 {
   
   private static String MESSAGE = "SECRET SIGNAL"; //Used to ignore exceptions.
   
   private static final int[] VALUES = new int[]{1, 2, 3, 4, 5, 6, 7, 8, 9};
   
   private SynchronousQueue<int[]> queue1, queue2;
   
   private int valueIndex;
   private int fieldValue;
   private AtomicInteger atomicFieldValue;
   
   public SyncTest2() {
      
      queue1 = new SynchronousQueue<>();
      queue2 = new SynchronousQueue<>();
      atomicFieldValue = new AtomicInteger(0);

      System.out.println("Starting.");
      new MyThread().start();
   }

   public void testLoop() {
      try {
         while(true){
            writeAndWait();
         }
      } catch (Exception e) {
         if(!MESSAGE.equals(e.getMessage())){
            e.printStackTrace();
         }
      }
   }
   
   public void writeAndWait() throws InterruptedException{
      valueIndex++;
      valueIndex %= VALUES.length;
      
      atomicFieldValue.set(VALUES[valueIndex]);
      fieldValue = VALUES[valueIndex];

      System.out.println("offering value");
      queue1.offer(VALUES);

      System.out.println("offered value, waiting for response");
      queue2.take(); //Wait for the thread to return.
      System.out.println("recieved response");
   }
   
   public class MyThread extends Thread{
      
      @Override
      public void run() {
         System.out.println("Thread started.");
         try {
            while(true){
               readAndRespond();
            }
         } catch (Exception e) {
            if(!MESSAGE.equals(e.getMessage())){
               e.printStackTrace();
            }
         }
      }
      
      public void readAndRespond() throws InterruptedException{
         
         queue1.take();
         
         if(fieldValue != atomicFieldValue.get()){
            System.out.println("Race condition detected!");
         }else{
            System.out.println("Race not detected!");
         }

         System.out.println("offering back value");
         queue2.offer(VALUES);
      }
      
   }
   
   public static void main(String[] args){
      new SyncTest2().testLoop();
   }
}





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