Syntax error Difference between CountDownLatch and CyclicBarrier in Java Concurrency

Difference between CountDownLatch and CyclicBarrier in Java Concurrency

CountDownLatch and CyclicBarrier both used in multithreading environment and they both are part of.

As per Java Doc −

CountDownLatch − A synchronization aid that allows one or more threads to wait until a set of operations being performed in other threads completes.

CyclicBarrier − A synchronization aid that allows a set of threads to all wait for each other to reach a common barrier point.

Sr. No. Key CyclicBarrier CountDownLatch
1
 Basic
 A synchronization aid that allows a set of threads to all wait for each other to reach a common barrier point.


 A synchronization aid that allows one or more threads to wait until a set of operations being performed in other threads completes.
2
 Ruunable
 It has a constructor where Runnable can be provided.
 It don’t have such constructor
3
 Thread /Task
 It maintains a count of threads
 It maintains a count of tasks
4.
 A dvanceable
 It is not advancable
 It is advancable.
5
 Exception
 If one thread is interrupted while waiting then all other waiting threads will throw B rokenBarrierException
 Only current thread will throw
InterruptedException. It will not impact other threads

Example of CyclicBarrier

public class Main {
   public static void main(String args[]) throws InterruptedException {
      ExecutorService executors = Executors.newFixedThreadPool(4);
      CyclicBarrier cyclicBarrier = new CyclicBarrier(5);
      executors.submit(new Service1(cyclicBarrier));
      executors.submit(new Service1(cyclicBarrier));
      executors.submit(new Service2(cyclicBarrier));
      executors.submit(new Service2(cyclicBarrier));
      executors.submit(new Service2(cyclicBarrier));
      Thread.sleep(3000);
      System.out.println("Done");
   }
}
import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CyclicBarrier;
public class Service1 implements Runnable {
   CyclicBarrier cyclicBarrier;
   public Service1(CyclicBarrier cyclicBarrier) {
      super();
      this.cyclicBarrier = cyclicBarrier;
   }
   @Override
   public void run() {
      System.out.println("Services1" + cyclicBarrier.getNumberWaiting());
      while (true) {
         try {
            cyclicBarrier.await();
         } catch (InterruptedException | BrokenBarrierException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
         }
      }
   }
}
import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CyclicBarrier;
public class Service2 implements Runnable {
   CyclicBarrier cyclicBarrier;
   public Service2(CyclicBarrier cyclicBarrier) {
      super();
      this.cyclicBarrier = cyclicBarrier;
   }
   @Override
   public void run() {
      System.out.println("Services2" + cyclicBarrier.getNumberWaiting());
      while (true) {
         try {
            cyclicBarrier.await();
         } catch (InterruptedException | BrokenBarrierException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
         }
      }
   }
}

Example of CountDownLatch

public class Main {
   public static void main(String args[]) throws InterruptedException {
      ExecutorService executors = Executors.newFixedThreadPool(4);
      CountDownLatch latch= new CountDownLatch(2);
      executors.submit(new Service1(latch));
      executors.submit(new Service2(latch));
      latch.await();
      System.out.println("Done");
   }
}
import java.util.concurrent.CountDownLatch;

public class Service1 implements Runnable {

   CountDownLatch latch;
   public Service1(CountDownLatch latch) {
      super();
      this.latch = latch;
   }

   @Override
   public void run() {
      try {
         Thread.sleep(20000);
      } catch (InterruptedException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
      }
      latch.countDown();
      System.out.println("Services2"+latch.getCount());
   }
}
import java.util.concurrent.CountDownLatch;
public class Service2 implements Runnable {
   CountDownLatch latch;
   public Service2(CountDownLatch latch) {
      super();
      this.latch = latch;
   }
   @Override
   public void run() {
      try {
         Thread.sleep(20000);
      } catch (InterruptedException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
      }
      latch.countDown();
      System.out.println("Services2"+latch.getCount());
   }
}
Updated on: 2020-09-09T11:55:46+05:30

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