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:org.qeo.deviceregistration.helper.RegistrationCredentialsWriterTask.java

/**
 * Create instance.//from w  w  w . j a va  2s .c  o  m
 *
 * @param ctx     activity context.
 * @param device  unregistered device detail to register.
 * @param realmId The realmId of the realm where to add the user/device to
 * @param userId  The userId of the user where to add the device to.
 */
public RegistrationCredentialsWriterTask(Context ctx, UnRegisteredDeviceModel device, long realmId,
        long userId) {
    if (userId <= 0) {
        throw new IllegalArgumentException("Invalid userId");
    }
    mSem = new Semaphore(0);
    mDeviceObject = device;
    this.mDeviceName = device.getUserFriendlyName();
    mCtx = ctx;
    mRealmId = realmId;
    mUserId = userId;
    mBroadcastManager = LocalBroadcastManager.getInstance(mCtx);
    mIntent = new Intent(ACTION_REGISTRATION_QEO_DONE);
}

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From source file:org.apache.asterix.experiment.client.StatisticsQueryGenerator.java

public void start() throws Exception {
    final Semaphore sem = new Semaphore(0);
    threadPool.submit(new QueryGenerator(sem, config));
    sem.acquire();/*from  w  w  w .  jav  a2s . c o  m*/
}

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From source file:com.bt.aloha.batchtest.ultramonkey.SyncServiceImpl.java

@Override
public void terminateCall(String callId) {
    synchronized (terminateCallLock) {
        super.terminateCall(callId);
        callTerminatedSemaphores.put(callId, new Semaphore(0));
    }//from  ww w .j  a v a 2  s . c  o m
    if (waitForCallTerminatedEvent(callId)) {
        return;
    }
    throw new ServiceException("No call terminated event received for callId " + callId);
}

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From source file:org.apache.synapse.debug.SynapseDebugInterface.java

/**
 * Initializes the communication command and event channels asynchronously.
 *
 * @param listenPortParam command port number
 * @param sendPortParam   event port number
 *///from  ww  w.j a v a  2  s .c o m
public void init(final int listenPortParam, final int sendPortParam) throws InterruptedException, IOException {
    log.info(SynapseDebugInterfaceConstants.LISTEN_ON_PORTS + " : Command " + listenPortParam + " - Event "
            + sendPortParam);
    this.runtimeSuspensionSem = new Semaphore(0);
    Thread channelCreator = new Thread(
            new AsynchronousChannelCreator(listenPortParam, sendPortParam, runtimeSuspensionSem));
    channelCreator.start();
    this.runtimeSuspensionSem.acquire();
    if (uncaughtException != null) {
        throw (IOException) uncaughtException;
    }
}

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From source file:org.apache.hadoop.mapred.gridmix.JobSubmitter.java

/**
 * Initialize the submission component with downstream monitor and pool of
 * files from which split data may be read.
 * @param monitor Monitor component to which jobs should be passed
 * @param threads Number of submission threads
 *   See {@link Gridmix#GRIDMIX_SUB_THR}.
 * @param queueDepth Max depth of pending work queue
 *   See {@link Gridmix#GRIDMIX_QUE_DEP}.
 * @param inputDir Set of files from which split data may be mined for
 * synthetic job// w  w w .j  a  v a 2  s .  c  o  m
 * @param statistics
 */
public JobSubmitter(JobMonitor monitor, int threads, int queueDepth, FilePool inputDir, Statistics statistics) {
    sem = new Semaphore(queueDepth);
    sched = new ThreadPoolExecutor(threads, threads, 0L, TimeUnit.MILLISECONDS,
            new LinkedBlockingQueue<Runnable>());
    this.inputDir = inputDir;
    this.monitor = monitor;
    this.statistics = statistics;
}

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From source file:org.artifactory.storage.db.binstore.service.FileCacheBinaryProviderImpl.java

public FileCacheBinaryProviderImpl(File rootDataDir, StorageProperties storageProperties) {
    super(getDataFolder(rootDataDir, storageProperties, StorageProperties.Key.binaryProviderCacheDir, "cache"));
    lruCache = Maps.newConcurrentMap();//  ww w . ja  v a2 s  . c o m
    totalSize = new AtomicLong(0);
    maxTotalSize = storageProperties.getBinaryProviderCacheMaxSize();
    cacheCleanerSemaphore = new Semaphore(1);
}

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From source file:org.apache.ranger.common.TestTimedExecutor.java

@Test
public void test() throws InterruptedException {
    /*// www.  j av  a  2 s .  c  om
     * Create a pool with 2 threads and queue size of 3 such that 6th item should get rejected right away due to capacity.
     */
    int poolSize = 2;
    int queueSize = 3;
    _configurator = new TimedExecutorConfigurator(poolSize, queueSize);
    // Just toa void thread shutting down and restarting set keep alive to high value.
    _executor.initialize(_configurator);

    // now create 2 callalbles that would keep waiting unless we ask them to proceed
    // create an executor which would simulate simultaneous threads calling into executor to perform lookups
    ExecutorService executorService = Executors.newCachedThreadPool();
    List<Future<Integer>> futures = new ArrayList<Future<Integer>>();
    /*
     * We would have 2 permits for 10 callables, such that
     * - 2 should succeed
     * - 5 should timeout (2 in pool + 3 in queue)
     * - 3 should get rejected.
     */
    Semaphore semaphore = new Semaphore(2);
    /*
     * We need a latch to keep track of when the processing is done so we can check the results of teh test
     */
    CountDownLatch latch = new CountDownLatch(10);
    // Callables will record exception in this map
    final ConcurrentMap<String, AtomicInteger> results = new ConcurrentHashMap<String, AtomicInteger>();
    for (int i = 0; i < 10; i++) {
        LookupTask lookupTask = new LookupTask(i, semaphore);
        TimedTask timedTask = new TimedTask(_executor, lookupTask, 1, TimeUnit.SECONDS, results, latch);
        Future<Integer> aFuture = executorService.submit(timedTask);
        futures.add(aFuture);
    }
    // Let's wait for the threads to finish
    LOG.debug("Starting to wait for threadpool to finish");
    latch.await();
    /*
     * depending on how threads get scheduled the count in results would vary, except we know for sure that.
     * - 2 must succeed since we have exactly 2 permits available.
     * - sum of timed out and rejected must be equal to 8.
       * - at least 3 and no more than 5 tasks must get rejected.
       * - at least 3 and no more than 5 tasks must get timed out
     */
    int successCount = results.get("success").get();
    int timeoutCount = results.get("java.util.concurrent.TimeoutException").get();
    int rejectedCount = results.get("java.util.concurrent.RejectedExecutionException").get();
    assertEquals("success count", 2, successCount);
    assertTrue("timeout[" + timeoutCount + "]: 3 <= count(timeout) <= 5",
            timeoutCount >= 3 && timeoutCount <= 5);
    assertTrue("rejected[" + rejectedCount + "]: 3 <= count(timeout) <= 5",
            rejectedCount >= 3 && rejectedCount <= 5);
    assertEquals("total should equal 10", 10, successCount + timeoutCount + rejectedCount);
    _executor.shutdown();
}

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From source file:org.apache.kylin.storage.hbase.util.HbaseStreamingInput.java

public static void addData(String tableName) throws IOException {

    createTable(tableName);//from w  w w  .  j  a v a  2s. c om

    final Semaphore semaphore = new Semaphore(0);
    new Thread(new Runnable() {
        @Override
        public void run() {
            scheduleJob(semaphore, 300000);//5 minutes a batch
        }
    }).start();

    while (true) {
        try {
            semaphore.acquire();
            int waiting = semaphore.availablePermits();
            if (waiting > 0) {
                logger.warn("There are another " + waiting + " batches waiting to be added");
            }
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
            e.printStackTrace();
        }

        Connection conn = getConnection();
        Table table = conn.getTable(TableName.valueOf(tableName));

        byte[] key = new byte[8 + 4];//time + id

        logger.info("============================================");
        long startTime = System.currentTimeMillis();
        logger.info("data load start time in millis: " + startTime);
        logger.info("data load start at " + formatTime(startTime));
        List<Put> buffer = Lists.newArrayList();
        for (int i = 0; i < (1 << 10); ++i) {
            long time = System.currentTimeMillis();
            Bytes.putLong(key, 0, time);
            Bytes.putInt(key, 8, i);
            Put put = new Put(key);
            byte[] cell = randomBytes(CELL_SIZE);
            put.addColumn(CF, QN, cell);
            buffer.add(put);
        }
        table.put(buffer);
        table.close();
        conn.close();
        long endTime = System.currentTimeMillis();
        logger.info("data load end at " + formatTime(endTime));
        logger.info("data load time consumed: " + (endTime - startTime));
        logger.info("============================================");
    }
}

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From source file:org.openhab.io.mqttembeddedbroker.internal.MqttEmbeddedBrokerServiceTest.java

public void waitForConnectionChange(MqttBrokerConnection c, MqttConnectionState expectedState)
        throws InterruptedException {
    Semaphore semaphore = new Semaphore(1);
    semaphore.acquire();/*from   ww  w. j  a va 2 s .c o m*/

    MqttConnectionObserver mqttConnectionObserver = (state, error) -> {
        if (state == expectedState) {
            semaphore.release();
        }
    };
    c.addConnectionObserver(mqttConnectionObserver);
    if (c.connectionState() == expectedState) {
        semaphore.release();
    }

    // Start the connection and wait until timeout or connected callback returns.
    semaphore.tryAcquire(3000, TimeUnit.MILLISECONDS);

    c.removeConnectionObserver(mqttConnectionObserver);

}

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From source file:io.mindmaps.engine.loader.DistributedLoader.java

public DistributedLoader(String graphNameInit, Collection<String> hosts) {
    ConfigProperties prop = ConfigProperties.getInstance();
    batchSize = prop.getPropertyAsInt(ConfigProperties.BATCH_SIZE_PROPERTY);
    graphName = graphNameInit;//from w ww.  j  a va 2s. c  om
    batch = new HashSet<>();
    hostsArray = hosts.toArray(new String[hosts.size()]);
    currentHost = 0;
    pollingFrequency = 30000;

    threadsNumber = prop.getAvailableThreads() * 3;

    // create availability map
    availability = new HashMap<>();
    hosts.forEach(h -> availability.put(h, new Semaphore(threadsNumber)));

    jobsTerminated = new HashMap<>();
    hosts.forEach(h -> jobsTerminated.put(h, 0));
}

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