Example usage for java.util.concurrent Semaphore Semaphore

Introduction

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

Prototype

public Semaphore(int permits) 

Source Link

Document

Creates a Semaphore with the given number of permits and nonfair fairness setting.

Usage

From source file:com.netflix.curator.framework.imps.TestFailedDeleteManager.java

@Test
public void testLostSession() throws Exception {
    Timing timing = new Timing();
    CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), timing.session(),
            timing.connection(), new ExponentialBackoffRetry(100, 3));
    try {//w  w w.j a v a 2s  .  c om
        client.start();

        client.create().forPath("/test-me");

        final CountDownLatch latch = new CountDownLatch(1);
        final Semaphore semaphore = new Semaphore(0);
        ConnectionStateListener listener = new ConnectionStateListener() {
            @Override
            public void stateChanged(CuratorFramework client, ConnectionState newState) {
                if ((newState == ConnectionState.LOST) || (newState == ConnectionState.SUSPENDED)) {
                    semaphore.release();
                } else if (newState == ConnectionState.RECONNECTED) {
                    latch.countDown();
                }
            }
        };
        client.getConnectionStateListenable().addListener(listener);
        server.stop();

        Assert.assertTrue(timing.acquireSemaphore(semaphore));
        try {
            client.delete().guaranteed().forPath("/test-me");
            Assert.fail();
        } catch (KeeperException.ConnectionLossException e) {
            // expected
        }
        Assert.assertTrue(timing.acquireSemaphore(semaphore));

        timing.sleepABit();

        server = new TestingServer(server.getPort(), server.getTempDirectory());
        Assert.assertTrue(timing.awaitLatch(latch));

        timing.sleepABit();

        Assert.assertNull(client.checkExists().forPath("/test-me"));
    } finally {
        IOUtils.closeQuietly(client);
    }
}

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From source file:com.netflix.curator.framework.recipes.shared.TestSharedCount.java

@Test
public void testMultiClients() throws Exception {
    final int CLIENT_QTY = 5;

    List<Future<List<Integer>>> futures = Lists.newArrayList();
    final List<CuratorFramework> clients = new CopyOnWriteArrayList<CuratorFramework>();
    try {/*from  ww w  . ja v  a2s  . c o  m*/
        final CountDownLatch startLatch = new CountDownLatch(CLIENT_QTY);
        final Semaphore semaphore = new Semaphore(0);
        ExecutorService service = Executors
                .newCachedThreadPool(new ThreadFactoryBuilder().setNameFormat("Test-%d").build());
        for (int i = 0; i < CLIENT_QTY; ++i) {
            Future<List<Integer>> future = service.submit(new Callable<List<Integer>>() {
                @Override
                public List<Integer> call() throws Exception {
                    final List<Integer> countList = Lists.newArrayList();
                    CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(),
                            new RetryOneTime(1));
                    clients.add(client);
                    client.start();

                    SharedCount count = new SharedCount(client, "/count", 10);

                    final CountDownLatch latch = new CountDownLatch(1);
                    count.addListener(new SharedCountListener() {
                        @Override
                        public void countHasChanged(SharedCountReader sharedCount, int newCount)
                                throws Exception {
                            if (newCount < 0) {
                                latch.countDown();
                            } else {
                                countList.add(newCount);
                            }

                            semaphore.release();
                        }

                        @Override
                        public void stateChanged(CuratorFramework client, ConnectionState newState) {
                        }
                    });
                    count.start();
                    startLatch.countDown();
                    latch.await();
                    return countList;
                }
            });
            futures.add(future);
        }

        CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(),
                new RetryOneTime(1));
        clients.add(client);
        client.start();

        Assert.assertTrue(startLatch.await(10, TimeUnit.SECONDS));

        SharedCount count = new SharedCount(client, "/count", 10);
        count.start();

        List<Integer> countList = Lists.newArrayList();
        Random random = new Random();
        for (int i = 0; i < 100; ++i) {
            Thread.sleep(random.nextInt(10));

            int next = random.nextInt(100);
            countList.add(next);
            count.setCount(next);

            Assert.assertTrue(semaphore.tryAcquire(CLIENT_QTY, 10, TimeUnit.SECONDS));
        }
        count.setCount(-1);

        for (Future<List<Integer>> future : futures) {
            List<Integer> thisCountList = future.get();
            Assert.assertEquals(thisCountList, countList);
        }
    } finally {
        for (CuratorFramework client : clients) {
            IOUtils.closeQuietly(client);
        }
    }
}

---

From source file:fr.aliasource.webmail.common.cache.CacheManager.java

public CacheManager(AccountCache cache, IAccount account) {
    this.logger = LogFactory.getLog(getClass());
    this.account = account;
    this.cache = cache;
    this.skipCount = 0;
    this.uidc = new HashMap<IFolder, UIDCache>();
    firstIndexingRoundLock = new Semaphore(1);
    refreshLock = new Semaphore(1);
    grabFirstLock();// w ww . ja  v a2  s .com
}

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From source file:com.isencia.passerelle.hmi.util.DynamicStepExecutionControlStrategy.java

public DynamicStepExecutionControlStrategy(Director container, String name)
        throws IllegalActionException, NameDuplicationException {
    super(container, name);
    container.setExecutionControlStrategy(this);
    // this kind of attribute is only for usage inside a IDE or HMI and these will add it everytime it's needed
    // so we must make sure it's not saved into the model's moml inadvertently...
    setPersistent(false);/*w  w  w  .j  av a 2 s .  co m*/

    busyActorCount = new Semaphore(0);
    stepEventCount = new Semaphore(0);
}

---

From source file:oz.hadoop.yarn.api.net.ContainerDelegateImpl.java

/**
 * //ww w.j ava2 s.  co m
 * @param selectionKey
 * @param clientServer
 */
ContainerDelegateImpl(SelectionKey selectionKey, ApplicationContainerServerImpl clientServer) {
    this.selectionKey = selectionKey;
    this.clientServer = clientServer;
    this.executionGovernor = new Semaphore(1);
    try {
        this.applicationContainerAddress = (InetSocketAddress) ((SocketChannel) this.selectionKey.channel())
                .getLocalAddress();
    } catch (Exception e) {
        throw new IllegalArgumentException("Failed to get Applicatioin Container's address", e);
    }
}

---

From source file:com.thoughtworks.go.agent.bootstrapper.AgentBootstrapperTest.java

@Test
public void shouldNotDieWhenCreationOfLauncherRaisesException() throws InterruptedException {
    final Semaphore waitForLauncherCreation = new Semaphore(1);
    waitForLauncherCreation.acquire();/*ww w .j  a v  a2  s  .  c om*/
    final boolean[] reLaunchWaitIsCalled = new boolean[1];
    final AgentBootstrapper bootstrapper = new AgentBootstrapper() {
        @Override
        void waitForRelaunchTime() {
            assertThat(waitTimeBeforeRelaunch, is(0));
            reLaunchWaitIsCalled[0] = true;
            super.waitForRelaunchTime();
        }

        @Override
        AgentLauncherCreator getLauncherCreator() {
            return new AgentLauncherCreator() {
                public AgentLauncher createLauncher() {
                    try {
                        throw new RuntimeException("i bombed");
                    } finally {
                        if (waitForLauncherCreation.availablePermits() == 0) {
                            waitForLauncherCreation.release();
                        }
                    }
                }

                @Override
                public void close() {
                }
            };
        }
    };

    final AgentBootstrapper spyBootstrapper = stubJVMExit(bootstrapper);

    Thread stopLoopThd = new Thread(new Runnable() {
        public void run() {
            try {
                waitForLauncherCreation.acquire();
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            }
            ReflectionUtil.setField(spyBootstrapper, "loop", false);
        }
    });
    stopLoopThd.start();
    try {
        spyBootstrapper.go(true,
                new AgentBootstrapperArgs(new URL("http://" + "ghost-name" + ":" + 3518 + "/go"), null,
                        AgentBootstrapperArgs.SslMode.NONE));
        stopLoopThd.join();
    } catch (Exception e) {
        fail("should not have propagated exception thrown while creating launcher");
    }
    assertThat(reLaunchWaitIsCalled[0], is(true));
}

---

From source file:org.apache.hcatalog.templeton.ExecServiceImpl.java

private ExecServiceImpl() {
    avail = new Semaphore(appConf.getInt(AppConfig.EXEC_MAX_PROCS_NAME, 16));
}

---

From source file:com.kurento.kmf.media.HttpPostEndpointAsyncTest.java

@Before
public void setup() throws InterruptedException {
    final Semaphore sem = new Semaphore(0);
    pipeline.newHttpPostEndpoint().buildAsync(new Continuation<HttpPostEndpoint>() {

        @Override/*from  www  . j  av a2  s .c o  m*/
        public void onSuccess(HttpPostEndpoint result) {
            httpEp = result;
            sem.release();
        }

        @Override
        public void onError(Throwable cause) {
            throw new KurentoMediaFrameworkException(cause);
        }
    });
    Assert.assertTrue(sem.tryAcquire(500, MILLISECONDS));
}

---

From source file:com.kurento.kmf.media.HttpGetEndpointAsyncTest.java

@Before
public void setup() throws InterruptedException {
    final Semaphore sem = new Semaphore(0);
    pipeline.newHttpGetEndpoint().buildAsync(new Continuation<HttpGetEndpoint>() {

        @Override//from  www .  j ava2s.c  o m
        public void onSuccess(HttpGetEndpoint result) {
            httpEp = result;
            sem.release();
        }

        @Override
        public void onError(Throwable cause) {
            throw new KurentoMediaFrameworkException(cause);
        }
    });
    Assert.assertTrue(sem.tryAcquire(500, MILLISECONDS));
}

---

From source file:com.netflix.curator.framework.recipes.leader.TestLeaderSelector.java

@Test
public void testAutoRequeue() throws Exception {
    LeaderSelector selector = null;/*from  w w w.j a va2  s.  c om*/
    CuratorFramework client = CuratorFrameworkFactory.builder().connectString(server.getConnectString())
            .retryPolicy(new RetryOneTime(1)).sessionTimeoutMs(1000).build();
    try {
        client.start();

        final Semaphore semaphore = new Semaphore(0);
        LeaderSelectorListener listener = new LeaderSelectorListener() {
            @Override
            public void takeLeadership(CuratorFramework client) throws Exception {
                Thread.sleep(10);
                semaphore.release();
            }

            @Override
            public void stateChanged(CuratorFramework client, ConnectionState newState) {
            }
        };
        selector = new LeaderSelector(client, "/leader", listener);
        selector.autoRequeue();
        selector.start();

        Assert.assertTrue(semaphore.tryAcquire(2, 10, TimeUnit.SECONDS));
    } finally {
        IOUtils.closeQuietly(selector);
        IOUtils.closeQuietly(client);
    }
}

---

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