Examples of CyclicBarrier

EDU.oswego.cs.dl.util.concurrent.CyclicBarrier
s.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/concurrent/intro.html"> Introduction to this package. ]
edu.emory.mathcs.backport.java.util.concurrent.CyclicBarrier
the completion of this iteration }
The CyclicBarrier uses an all-or-none breakage model for failed synchronization attempts: If a thread leaves a barrier point prematurely because of interruption, failure, or timeout, all other threads waiting at that barrier point will also leave abnormally via {@link BrokenBarrierException} (or{@link InterruptedException} if they too were interrupted at aboutthe same time). @since 1.5 @see CountDownLatch @author Doug Lea
java.util.concurrent.CyclicBarrier
until done for (Thread thread : threads) thread.join(); } }} Here, each worker thread processes a row of the matrix then waits at the barrier until all rows have been processed. When all rows are processed the supplied {@link Runnable} barrier action is executed and merges therows. If the merger determines that a solution has been found then {@code done()} will return{@code true} and each worker will terminate.
If the barrier action does not rely on the parties being suspended when it is executed, then any of the threads in the party could execute that action when it is released. To facilitate this, each invocation of {@link #await} returns the arrival index of that thread at the barrier.You can then choose which thread should execute the barrier action, for example:
```
  {@code}if (barrier.await() == 0)  // log the completion of this iteration }}
```
The {@code CyclicBarrier} uses an all-or-none breakage modelfor failed synchronization attempts: If a thread leaves a barrier point prematurely because of interruption, failure, or timeout, all other threads waiting at that barrier point will also leave abnormally via {@link BrokenBarrierException} (or{@link InterruptedException} if they too were interrupted at aboutthe same time).
Memory consistency effects: Actions in a thread prior to calling {@code await()}happen-before actions that are part of the barrier action, which in turn happen-before actions following a successful return from the corresponding {@code await()} in other threads. @since 1.5 @see CountDownLatch @author Doug Lea

Examples of java.util.concurrent.CyclicBarrier

         if (tm.getStatus() == Status.STATUS_ACTIVE) tm.commit();
         else tm.rollback();
      }


      int nbWriters = 10;
      CyclicBarrier barrier = new CyclicBarrier(nbWriters + 1);
      List<Future<Void>> futures = new ArrayList<Future<Void>>(nbWriters);
      ExecutorService executorService = Executors.newCachedThreadPool(new ThreadFactory() {
         volatile int i = 0;
         @Override
         public Thread newThread(Runnable r) {
            int ii = i++;
            return new Thread(r, "EntryWriter-" + ii + ", WriteSkewTest");
         }
      });


      try {
         for (int i = 0; i < nbWriters; i++) {
            log.debug("Schedule execution");
            Future<Void> future = executorService.submit(new EntryWriter(barrier));
            futures.add(future);
         }
         barrier.await(); // wait for all threads to be ready
         barrier.await(); // wait for all threads to finish


         log.debug("All threads finished, let's shutdown the executor and check whether any exceptions were reported");
         for (Future<Void> future : futures) future.get();
      } finally {
         executorService.shutdownNow();

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Examples of java.util.concurrent.CyclicBarrier

   protected void teardown() {
      TestingUtil.killCacheManagers(cacheManager);
   }


   public void testConcurrentGetCacheCalls() throws Exception {
      final CyclicBarrier barrier = new CyclicBarrier(NUM_THREADS + 1);
      List<Future<Void>> futures = new ArrayList<Future<Void>>(NUM_THREADS);
      ExecutorService executorService = Executors.newFixedThreadPool(NUM_THREADS);
      for (int i = 0; i < NUM_THREADS; i++) {
         log.debug("Schedule execution");
         final String name = "cache" + (i % NUM_CACHES);


         Future<Void> future = executorService.submit(new Callable<Void>(){
            @Override
            public Void call() throws Exception {
               try {
                  barrier.await();
                  cacheManager.getCache(name).put("a", "b");
                  return null;
               } catch (Throwable t) {
                  log.error("Got", t);
                  throw new RuntimeException(t);
               }  finally {
                  log.debug("Wait for all execution paths to finish");
                  barrier.await();
               }
            }
         });
         futures.add(future);
      }
      barrier.await(); // wait for all threads to be ready
      barrier.await(); // wait for all threads to finish


      log.debug("All threads finished, let's shutdown the executor and check whether any exceptions were reported");
      for (Future<Void> future : futures) future.get();
      executorService.shutdownNow();
   }

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