JavaMadeSoEasy.com (JMSE): Similarity and Difference between CyclicBarrier and CountDownLatch in Java

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CyclicBarrier in java

Similarity and Important Differences between CyclicBarrier and CountDownLatch in Java >

First let’s discuss Similarity between CyclicBarrier and CountDownLatch in Java. CyclicBarrier and CountDownLatch are similar because they wait for specified number of thread to reach certain point and make count/parties equal to 0. But ,

for completing wait in CountDownLatch specified number of threads must call countDown() method in Java.

for completing wait in CyclicBarrier specified number of threads must call await() method in Java.

Let’ see there constructor’s in Java >

CountDownLatch(int count)

CountDownLatch is initialized with given count.

count specifies the number of events that must occur before latch is released.

CyclicBarrier(int parties)

New CyclicBarrier is created where parties number of thread wait for each other to reach common barrier point, when all threads have reached common barrier point, parties number of waiting threads are released.

This is very important difference between CyclicBarrier and CountDownLatch in java. CyclicBarrier can be awaited repeatedly, but CountDownLatch can’t be awaited repeatedly. i.e. once count has become 0 cyclicBarrier can be used again but CountDownLatch cannot be used again in Java.

Another important difference between CyclicBarrier and CountDownLatch in java. CyclicBarrier can be used to trigger event, but CountDownLatch can’t be used to launch event. i.e. once count has become 0 cyclicBarrier can trigger event in Java but CountDownLatch can’t.

How can cyclicBarrier launch event in java?

CyclicBarrier provides constructor for triggering event in Java.

CyclicBarrier(int parties, Runnable barrierAction)

So, in this thread concurrency tutorial we read what are Similarity and important Difference between CyclicBarrier and CountDownLatch in Java.

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