Examples of ICountDownLatch

com.hazelcast.core.ICountDownLatch
ICountDownLatch is a backed-up distributed alternative to the {@link java.util.concurrent.CountDownLatch java.util.concurrent.CountDownLatch}.
ICountDownLatch is a cluster-wide synchronization aid that allows one or more threads to wait until a set of operations being performed in other threads completes.
There are a few differences compared to the {@link ICountDownLatch}:
1. the ICountDownLatch count can be re-set using {@link #trySetCount(int)} after a countdownhas finished but not during an active count. This allows the same latch instance to be reused.
2. there is no await() method to do an unbound wait since this is undesirable in a distributed application: it can happen that for example a cluster is split or that the master and replica's all die. So in most cases it is best to configure an explicit timeout so have the ability to deal with these situations.

Examples of com.hazelcast.core.ICountDownLatch

        latch.trySetCount(-20);
    }


    @Test
    public void testTrySetCount_whenCountIsNotZero() {
        ICountDownLatch latch = hz.getCountDownLatch(randomString());
        latch.trySetCount(10);
        assertFalse(latch.trySetCount(20));
        assertFalse(latch.trySetCount(0));
        assertEquals(10, latch.getCount());
    }

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Examples of com.hazelcast.core.ICountDownLatch

    // Generate the list of actions per DNode
    Map<String, List<DeployAction>> actionsPerDNode = generateDeployActionsPerDNode(deployRequests,
        version);


    // Starting the countdown latch.
    ICountDownLatch countDownLatchForDeploy = context.getCoordinationStructures()
        .getCountDownLatchForDeploy(version);
    Set<String> dnodesInvolved = actionsPerDNode.keySet();
    countDownLatchForDeploy.trySetCount(dnodesInvolved.size());


    // Sending deploy signals to each DNode
    for(Map.Entry<String, List<DeployAction>> actionPerDNode : actionsPerDNode.entrySet()) {
      DNodeService.Client client = null;
      boolean renew = false;

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Examples of com.hazelcast.core.ICountDownLatch

          + version + "]");
      CoordinationStructures.DEPLOY_IN_PROGRESS.incrementAndGet();


      try {
        long waitSeconds = 0;
        ICountDownLatch countDownLatchForDeploy = context.getCoordinationStructures()
            .getCountDownLatchForDeploy(version);
        boolean finished;
        do {
          finished = countDownLatchForDeploy.await(secondsToCheckFailureOrTimeout, TimeUnit.SECONDS);
          waitSeconds += secondsToCheckFailureOrTimeout;
          if(!finished) {
            // If any of the DNodes failed, then we cancel the deployment.
            if(checkForFailure()) {
              explainErrors();

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Examples of com.hazelcast.core.ICountDownLatch

                  log.warn("Error deploying [" + deployActions + "] barrier + [" + version + "]", t);
                  abortDeploy(version, ExceptionUtils.getStackTrace(t));
                } finally {
                  // Decrement the countdown latch. On 0, deployer knows that the deploy
                  // finished.
                  ICountDownLatch countdown = coord.getCountDownLatchForDeploy(version);
                  countdown.countDown();
                }
              }
            });
            try {
              // This line makes the wait thread wait for the deploy as long as the configuration tells

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