Example usage for java.util.concurrent CyclicBarrier CyclicBarrier

Introduction

In this page you can find the example usage for java.util.concurrent CyclicBarrier CyclicBarrier.

Prototype

public CyclicBarrier(int parties)

Source Link

Document

Creates a new CyclicBarrier that will trip when the given number of parties (threads) are waiting upon it, and does not perform a predefined action when the barrier is tripped.

Usage

From source file:org.nuxeo.ecm.core.storage.sql.TestSQLBackend.java

protected static void runParallelLocking(Serializable nodeId, Repository repository1, Repository repository2)
        throws Throwable {
    CyclicBarrier barrier = new CyclicBarrier(2);
    CountDownLatch firstReady = new CountDownLatch(1);
    long TIME = 1000; // ms
    LockingJob r1 = new LockingJob(repository1, "t1-", nodeId, TIME, firstReady, barrier);
    LockingJob r2 = new LockingJob(repository2, "t2-", nodeId, TIME, null, barrier);
    Thread t1 = null;/*from  ww  w.j ava2 s  .com*/
    Thread t2 = null;
    try {
        t1 = new Thread(r1, "t1");
        t2 = new Thread(r2, "t2");
        t1.start();
        if (firstReady.await(60, TimeUnit.SECONDS)) {
            t2.start();

            t1.join();
            t1 = null;
            t2.join();
            t2 = null;
            if (r1.throwable != null) {
                throw r1.throwable;
            }
            if (r2.throwable != null) {
                throw r2.throwable;
            }
            int count = r1.count + r2.count;
            log.warn("Parallel locks per second: " + count);
        } // else timed out
    } finally {
        // error condition recovery
        if (t1 != null) {
            t1.interrupt();
        }
        if (t2 != null) {
            t2.interrupt();
        }
    }
}

From source file:org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.TestLeafQueue.java

@Test
public void testConcurrentAccess() throws Exception {
    YarnConfiguration conf = new YarnConfiguration();
    RMStorageFactory.setConfiguration(conf);
    YarnAPIStorageFactory.setConfiguration(conf);
    DBUtility.InitializeDB();//  w ww.  j  ava  2  s.c  om
    MockRM rm = new MockRM();
    rm.init(conf);
    rm.start();

    final String queue = "default";
    final String user = "user";
    CapacityScheduler cs = (CapacityScheduler) rm.getResourceScheduler();
    final LeafQueue defaultQueue = (LeafQueue) cs.getQueue(queue);

    final List<FiCaSchedulerApp> listOfApps = createListOfApps(10000, user, defaultQueue);

    final CyclicBarrier cb = new CyclicBarrier(2);
    final List<ConcurrentModificationException> conException = new ArrayList<ConcurrentModificationException>();

    Thread submitAndRemove = new Thread(new Runnable() {

        @Override
        public void run() {

            for (FiCaSchedulerApp fiCaSchedulerApp : listOfApps) {
                defaultQueue.submitApplicationAttempt(fiCaSchedulerApp, user);
            }
            try {
                cb.await();
            } catch (Exception e) {
                // Ignore
            }
            for (FiCaSchedulerApp fiCaSchedulerApp : listOfApps) {
                defaultQueue.finishApplicationAttempt(fiCaSchedulerApp, queue);
            }
        }
    }, "SubmitAndRemoveApplicationAttempt Thread");

    Thread getAppsInQueue = new Thread(new Runnable() {
        List<ApplicationAttemptId> apps = new ArrayList<ApplicationAttemptId>();

        @Override
        public void run() {
            try {
                try {
                    cb.await();
                } catch (Exception e) {
                    // Ignore
                }
                defaultQueue.collectSchedulerApplications(apps);
            } catch (ConcurrentModificationException e) {
                conException.add(e);
            }
        }

    }, "GetAppsInQueue Thread");

    submitAndRemove.start();
    getAppsInQueue.start();

    submitAndRemove.join();
    getAppsInQueue.join();

    assertTrue("ConcurrentModificationException is thrown", conException.isEmpty());
    rm.stop();

}

From source file:org.nuxeo.ecm.core.storage.sql.TestSQLBackend.java

@Test
public void testParallelPrepareUserReadAcls() throws Throwable {
    Session session = repository.getConnection();
    Node root = session.getRootNode();
    session.addChildNode(root, "foo", null, "TestDoc", false);
    session.save();//from www  .  j  av  a 2s.c  o m
    session.close();

    CyclicBarrier barrier = new CyclicBarrier(2);
    CountDownLatch firstReady = new CountDownLatch(1);
    PrepareUserReadAclsJob r1 = new PrepareUserReadAclsJob(firstReady, barrier);
    PrepareUserReadAclsJob r2 = new PrepareUserReadAclsJob(null, barrier);
    Thread t1 = null;
    Thread t2 = null;
    try {
        t1 = new Thread(r1, "t1");
        t2 = new Thread(r2, "t2");
        t1.start();
        if (firstReady.await(60, TimeUnit.SECONDS)) {
            t2.start();

            t1.join();
            t1 = null;
            t2.join();
            t2 = null;
            if (r1.throwable != null) {
                throw r1.throwable;
            }
            if (r2.throwable != null) {
                throw r2.throwable;
            }
        } // else timed out
    } finally {
        // error condition recovery
        if (t1 != null) {
            t1.interrupt();
        }
        if (t2 != null) {
            t2.interrupt();
        }
    }

    // after both threads have run, check that we don't see
    // duplicate documents
    session = repository.getConnection();
    checkOneDoc(session);
    session.close();

}