Examples of java.util.concurrent.CyclicBarrier

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

        this.num_channels=num_channels;
        this.num_threads=num_threads;
        this.num_msgs=num_msgs;
        this.msg_size=msg_size;
        this.buddies=buddies;
        start_barrier=new CyclicBarrier(num_channels * num_threads +1);
        terminate_barrier=new CyclicBarrier(num_channels +1);
        if(buddies > num_channels)
            throw new IllegalArgumentException("buddies needs to be smaller than number of channels");
    }

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        assertEquals("queue.size() should be 0, but is " + queue.size(), 0, queue.size());
    }




    public void testMultipleTakersOnePutter() throws Exception {
        final CyclicBarrier barrier=new CyclicBarrier(11);
        for(int i=0; i < 10; i++) {
            new Thread() {
                public void run() {
                    try {
                        barrier.await();
                        queue.take();


                    }
                    catch(Exception e) {
                    }
                }
            }.start();
        }
        barrier.await();
        for(int i=0; i < 10; i++) {
            queue.put(a1, s1, i);
            queue.done(a1, s1);
        }
        Util.sleep(100);

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        assertEquals(0, queue.size());
    }




    public void testOrderingMultipleThreads() throws BrokenBarrierException, InterruptedException {
        CyclicBarrier barrier=new CyclicBarrier(4);
        int NUM=500;
        Producer p1=new Producer(queue, "s1",    1, NUM, barrier);
        Producer p2=new Producer(queue, "s2", 1001, NUM, barrier);
        Producer p3=new Producer(queue, "s3", 2001, NUM, barrier);


        p1.start();
        p2.start();
        p3.start();
        Util.sleep(100);
        barrier.await(); // starts all 3 threads


        p1.join();
        p2.join();
        p3.join();
        System.out.println("queue: " + queue.size() + " elements");

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    return client;
  }


  @Test (timeout = 10000)
  public void testOutOfOrder() throws Exception {
    CyclicBarrier barrierA = new CyclicBarrier(2);
    CyclicBarrier barrierB = new CyclicBarrier(2);
    CyclicBarrier barrierC = new CyclicBarrier(2);
    asyncClient = new MockNMClientAsync2(barrierA, barrierB, barrierC);
    asyncClient.init(new Configuration());
    asyncClient.start();


    final Container container = mockContainer(1);
    final ContainerLaunchContext clc =
        recordFactory.newRecordInstance(ContainerLaunchContext.class);


    // start container from another thread
    Thread t = new Thread() {
      @Override
      public void run() {
        asyncClient.startContainerAsync(container, clc);
      }
    };
    t.start();


    barrierA.await();
    asyncClient.stopContainerAsync(container.getId(), container.getNodeId());
    barrierC.await();


    Assert.assertFalse("Starting and stopping should be out of order",
        ((TestCallbackHandler2) asyncClient.getCallbackHandler())
            .exceptionOccurred.get());
  }

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        throws Exception {
      tasks = conf.getInt("bsp.peers.num", 1);


      synchronized (LocalSyncClient.class) {
        if (barrier == null) {
          barrier = new CyclicBarrier(tasks);
          LOG.info("Setting up a new barrier for " + tasks + " tasks!");
        }
      }
    }

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      long seed = r.nextLong();
      System.out.println("SEED: " + seed);
      r.setSeed(seed);


      // cause chmod to fail after a delay
      final CyclicBarrier barrier = new CyclicBarrier(2);
      doAnswer(new Answer<Void>() {
          public Void answer(InvocationOnMock invocation) throws IOException {
            try {
              barrier.await();
            } catch (InterruptedException e) {
            } catch (BrokenBarrierException e) {
            }
            throw new IOException("forced failure");
          }
        }).when(spylfs)
            .setPermission(isA(Path.class), isA(FsPermission.class));


      // Queue up two localization requests for the same public resource
      final LocalResource pubResource = getPublicMockedResource(r);
      final LocalResourceRequest pubReq = new LocalResourceRequest(pubResource);


      Map<LocalResourceVisibility, Collection<LocalResourceRequest>> req =
          new HashMap<LocalResourceVisibility,
                      Collection<LocalResourceRequest>>();
      req.put(LocalResourceVisibility.PUBLIC,
          Collections.singletonList(pubReq));


      Set<LocalResourceRequest> pubRsrcs = new HashSet<LocalResourceRequest>();
      pubRsrcs.add(pubReq);


      spyService.handle(new ContainerLocalizationRequestEvent(c, req));
      spyService.handle(new ContainerLocalizationRequestEvent(c, req));
      dispatcher.await();


      // allow the chmod to fail now that both requests have been queued
      barrier.await();
      verify(containerBus, timeout(5000).times(2))
          .handle(isA(ContainerResourceFailedEvent.class));
    } finally {
      dispatcher.stop();
    }

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    server.start();


    int numConcurrentRPC = 200;
    InetSocketAddress addr = NetUtils.getConnectAddress(server);
    final CyclicBarrier barrier = new CyclicBarrier(numConcurrentRPC);
    final CountDownLatch latch = new CountDownLatch(numConcurrentRPC);
    final AtomicBoolean leaderRunning = new AtomicBoolean(true);
    final AtomicReference<Throwable> error = new AtomicReference<Throwable>();
    Thread leaderThread = null;
    
    for (int i = 0; i < numConcurrentRPC; i++) {
      final int num = i;
      final TestProtocol proxy = RPC.getProxy(
      TestProtocol.class, TestProtocol.versionID, addr, conf);
      Thread rpcThread = new Thread(new Runnable() {
        @Override
        public void run() {
          try {
            barrier.await();
            while (num == 0 || leaderRunning.get()) {
              proxy.slowPing(false);
            }


            proxy.slowPing(false);

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    localFS = FileContext.getLocalFSFileContext();
    tmpDir.mkdirs();
    logsDir.mkdirs();
    remoteLogsDir.mkdirs();
    nmLocalDir.mkdirs();
    syncBarrier = new CyclicBarrier(2);
  }

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    conf.setLong(YarnConfiguration
        .RESOURCEMANAGER_CONNECT_RETRY_INTERVAL_MS,
        connectionRetryIntervalMs);
    conf.setLong(YarnConfiguration.NM_SLEEP_DELAY_BEFORE_SIGKILL_MS, 5000);
    conf.setLong(YarnConfiguration.NM_LOG_RETAIN_SECONDS, 1);
    CyclicBarrier syncBarrier = new CyclicBarrier(2);
    nm = new MyNodeManager2(syncBarrier, conf);
    nm.init(conf);
    nm.start();
    // start a container
    ContainerId cId = TestNodeManagerShutdown.createContainerId();
    FileContext localFS = FileContext.getLocalFSFileContext();
    TestNodeManagerShutdown.startContainer(nm, cId, localFS, nmLocalDir,
      new File("start_file.txt"));


    try {
      syncBarrier.await(10000, TimeUnit.MILLISECONDS);
    } catch (Exception e) {
    }
    Assert.assertFalse("Containers not cleaned up when NM stopped",
      assertionFailedInThread.get());
    Assert.assertTrue(((MyNodeManager2) nm).isStopped);

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  @SuppressWarnings({ "rawtypes", "unchecked" })
  @Test(timeout = 5000)
  public void testContainerCleaned() throws Exception {
    LOG.info("STARTING testContainerCleaned");
    
    CyclicBarrier startLaunchBarrier = new CyclicBarrier(2);
    CyclicBarrier completeLaunchBarrier = new CyclicBarrier(2);


    AppContext mockContext = mock(AppContext.class);
    
    EventHandler mockEventHandler = mock(EventHandler.class);
    when(mockContext.getEventHandler()).thenReturn(mockEventHandler);


    ContainerManagementProtocol mockCM =
        new ContainerManagerForTest(startLaunchBarrier, completeLaunchBarrier);
    ContainerLauncherImplUnderTest ut =
        new ContainerLauncherImplUnderTest(mockContext, mockCM);
    
    Configuration conf = new Configuration();
    ut.init(conf);
    ut.start();
    try {
      ContainerId contId = makeContainerId(0l, 0, 0, 1);
      TaskAttemptId taskAttemptId = makeTaskAttemptId(0l, 0, 0, TaskType.MAP, 0);
      String cmAddress = "127.0.0.1:8000";
      StartContainersResponse startResp =
        recordFactory.newRecordInstance(StartContainersResponse.class);
      startResp.setAllServicesMetaData(serviceResponse);
      
     
      LOG.info("inserting launch event");
      ContainerRemoteLaunchEvent mockLaunchEvent = 
        mock(ContainerRemoteLaunchEvent.class);
      when(mockLaunchEvent.getType())
        .thenReturn(EventType.CONTAINER_REMOTE_LAUNCH);
      when(mockLaunchEvent.getContainerID())
        .thenReturn(contId);
      when(mockLaunchEvent.getTaskAttemptID()).thenReturn(taskAttemptId);
      when(mockLaunchEvent.getContainerMgrAddress()).thenReturn(cmAddress);
      when(mockLaunchEvent.getContainerToken()).thenReturn(
          createNewContainerToken(contId, cmAddress));
      ut.handle(mockLaunchEvent);
      
      startLaunchBarrier.await();
      
           
      LOG.info("inserting cleanup event");
      ContainerLauncherEvent mockCleanupEvent = 
        mock(ContainerLauncherEvent.class);
      when(mockCleanupEvent.getType())
        .thenReturn(EventType.CONTAINER_REMOTE_CLEANUP);
      when(mockCleanupEvent.getContainerID())
        .thenReturn(contId);
      when(mockCleanupEvent.getTaskAttemptID()).thenReturn(taskAttemptId);
      when(mockCleanupEvent.getContainerMgrAddress()).thenReturn(cmAddress);
      ut.handle(mockCleanupEvent);


      completeLaunchBarrier.await();
     
      ut.waitForPoolToIdle();
      
      ArgumentCaptor<Event> arg = ArgumentCaptor.forClass(Event.class);
      verify(mockEventHandler, atLeast(2)).handle(arg.capture());

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