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Showing posts with label java concurrency tutorial. Show all posts
Showing posts with label java concurrency tutorial. Show all posts

Explain about CyclicBarrier in Java

1:28 AM
How to use CyclicBarrier in Java - Concurrency Tutorial This is the second part of my concurrency tutorial, in the first part, you have learned how to use CountDownLatch and in this part, you will learn how to use CyclicBarrier class in Java. CyclicBarrier is another concurrency utility introduced in Java 5 which is used when a number of threads (also known as parties) want to wait for each other at a common point, also known as the barrier before starting processing again. Its similar to CountDownLatch but instead of calling countDown() each thread calls await() and when last thread calls await() which signals that it has reached the barrier, all thread started processing again, also known as a barrier is broken. You can use CyclicBarrier wherever you want to use CountDownLatch, but the opposite is not possible because you can not reuse the latch once the count reaches to zero. Some of the common usages of CyclicBarrier is in writing a unit test for concurrent program, to simulate
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Explain about CountDowaLatch

1:18 AM
Explain about CountDowaLatch CountDowaLatch is a high-level synchronization utility which is used to prevent a particular thread to start processing until all threads are ready. This is achieved by a countdown. The thread, which needs to wait for starts with a counter, each thread them make the count down by 1 when they become ready, once the last thread call countDown() method, then the latch is broken and the thread waiting with counter starts running. CountDownLatch is a useful synchronizer and used heavily in multi-threaded testing. You can use this class to simulate truly concurrent behavior i.e. trying to access something at the same time once every thread is ready. Worth noting is that CountDownLatch starts with a fixed number of counts which cannot be changed later, though this restriction is re-mediated in Java 7 by introducing a similar but flexible concurrency utility called Phaser. There is another similar utility called CyclicBarrier, which can also be used in this si
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