Example usage for java.util.concurrent BlockingQueue add

Introduction

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

Prototype

boolean add(E e);

Source Link

Document

Inserts the specified element into this queue if it is possible to do so immediately without violating capacity restrictions, returning true upon success and throwing an IllegalStateException if no space is currently available.

Usage

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

@Test
public void testConnectionState() throws Exception {
    Timing timing = new Timing();
    CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), timing.session(),
            timing.connection(), new RetryOneTime(1));
    try {// w  w  w . j  ava  2s .c o  m
        final BlockingQueue<ConnectionState> queue = new LinkedBlockingQueue<ConnectionState>();
        ConnectionStateListener listener = new ConnectionStateListener() {
            @Override
            public void stateChanged(CuratorFramework client, ConnectionState newState) {
                queue.add(newState);
            }
        };
        client.getConnectionStateListenable().addListener(listener);

        client.start();
        Assert.assertEquals(queue.poll(timing.multiple(4).seconds(), TimeUnit.SECONDS),
                ConnectionState.CONNECTED);
        server.stop();
        Assert.assertEquals(queue.poll(timing.multiple(4).seconds(), TimeUnit.SECONDS),
                ConnectionState.SUSPENDED);
        Assert.assertEquals(queue.poll(timing.multiple(4).seconds(), TimeUnit.SECONDS), ConnectionState.LOST);
    } finally {
        IOUtils.closeQuietly(client);
    }
}

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From source file:io.nats.client.ITClusterTest.java

/**
 * Ensures that if a ping is not ponged within the pingInterval, that a disconnect/reconnect
 * takes place.//from   w w  w .  java 2 s.c om
 * <p>
 * <p>We test this by setting maxPingsOut < 0 and setting the pingInterval very small. After
 * the first
 * disconnect, we measure the reconnect-to-disconnect time to ensure it isn't greater than 2
 * * pingInterval.
 *
 * @throws Exception if anything goes wrong
 */
@Test
public void testPingReconnect() throws Exception {
    final int reconnects = 4;
    final AtomicInteger timesReconnected = new AtomicInteger();
    //        setLogLevel(Level.DEBUG);
    try (NatsServer s1 = runServerOnPort(1222)) {
        Options opts = new Options.Builder(defaultOptions()).dontRandomize().reconnectWait(200).pingInterval(50)
                .maxPingsOut(-1).timeout(1000).build();
        opts.servers = Nats.processUrlArray(testServers);

        final CountDownLatch wg = new CountDownLatch(reconnects);
        final BlockingQueue<Long> rch = new LinkedBlockingQueue<Long>(reconnects);
        final BlockingQueue<Long> dch = new LinkedBlockingQueue<Long>(reconnects);

        opts.disconnectedCb = new DisconnectedCallback() {
            public void onDisconnect(ConnectionEvent event) {
                dch.add(System.nanoTime());
            }
        };

        opts.reconnectedCb = new ReconnectedCallback() {
            @Override
            public void onReconnect(ConnectionEvent event) {
                rch.add(System.nanoTime());
                wg.countDown();
            }
        };

        try (ConnectionImpl c = (ConnectionImpl) opts.connect()) {
            wg.await();
            s1.shutdown();

            // Throw away the first one
            dch.take();
            for (int i = 0; i < reconnects - 1; i++) {
                Long disconnectedAt = dch.take();
                Long reconnectedAt = rch.take();
                Long pingCycle = TimeUnit.NANOSECONDS.toMillis(disconnectedAt - reconnectedAt);
                assertFalse(String.format("Reconnect due to ping took %d msec", pingCycle),
                        pingCycle > 2 * c.getOptions().getPingInterval());
            }
        }
    }
}

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From source file:org.opencastproject.videosegmenter.impl.VideoSegmenterServiceImpl.java

/**
 * Fills the look ahead buffer with the next <code>STABILITY_THRESHOLD</code> images.
 * //from ww w . j a  va2s .co  m
 * @param queue
 *          the buffer
 * @param currentBuffer
 *          the current buffer
 * @param dsh
 *          the data source handler
 * @throws IOException
 *           if reading from the data source fails
 */
private void fillLookAheadBuffer(BlockingQueue<Buffer> queue, Buffer currentBuffer, FrameGrabber dsh)
        throws IOException {
    queue.clear();
    queue.add(currentBuffer);
    for (int i = 0; i < stabilityThreshold - 1; i++) {
        Buffer b = dsh.getBuffer();
        if (b != null && !b.isEOM())
            queue.add(b);
        else
            return;
    }
}

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

@SuppressWarnings({ "ForLoopReplaceableByForEach" })
@Test// w w w  .  j  a v a2  s  .c o  m
public void testRotatingLeadership() throws Exception {
    final int LEADER_QTY = 5;
    final int REPEAT_QTY = 3;

    final Timing timing = new Timing();
    CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), timing.session(),
            timing.connection(), new RetryOneTime(1));
    client.start();
    try {
        final BlockingQueue<Integer> leaderList = new LinkedBlockingQueue<Integer>();
        List<LeaderSelector> selectors = Lists.newArrayList();
        for (int i = 0; i < LEADER_QTY; ++i) {
            final int ourIndex = i;
            LeaderSelector leaderSelector = new LeaderSelector(client, PATH_NAME, new LeaderSelectorListener() {
                @Override
                public void takeLeadership(CuratorFramework client) throws Exception {
                    timing.sleepABit();
                    leaderList.add(ourIndex);
                }

                @Override
                public void stateChanged(CuratorFramework client, ConnectionState newState) {
                }
            });
            selectors.add(leaderSelector);
        }

        List<Integer> localLeaderList = Lists.newArrayList();
        for (int i = 1; i <= REPEAT_QTY; ++i) {
            for (LeaderSelector leaderSelector : selectors) {
                if (i > 1) {
                    leaderSelector.requeue();
                } else {
                    leaderSelector.start();
                }
            }

            while (localLeaderList.size() != (i * selectors.size())) {
                Integer polledIndex = leaderList.poll(10, TimeUnit.SECONDS);
                Assert.assertNotNull(polledIndex);
                localLeaderList.add(polledIndex);
            }
            timing.sleepABit();
        }

        for (LeaderSelector leaderSelector : selectors) {
            leaderSelector.close();
        }
        System.out.println(localLeaderList);

        for (int i = 0; i < REPEAT_QTY; ++i) {
            Set<Integer> uniques = Sets.newHashSet();
            for (int j = 0; j < selectors.size(); ++j) {
                Assert.assertTrue(localLeaderList.size() > 0);

                int thisIndex = localLeaderList.remove(0);
                Assert.assertFalse(uniques.contains(thisIndex));
                uniques.add(thisIndex);
            }
        }
    } finally {
        client.close();
    }
}

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From source file:org.kuali.rice.krad.data.provider.ProviderRegistryImplTest.java

/**
 * Verifies ProviderRegistryImpl is threadsafe
 *///from ww w  . j av  a  2s . c o  m
@Test
public void testConcurrency() throws InterruptedException {
    final Class<? extends Provider>[] TYPES = new Class[] { Provider.class, MetadataProvider.class,
            PersistenceProvider.class, CustomProvider.class };

    int providers = 50;
    int threads = providers * 2; // just use live threads for all consumers/producers to ensure no consumer deadlock

    final BlockingQueue<Provider> queue = new LinkedBlockingQueue<Provider>();
    ExecutorService threadpool = Executors.newFixedThreadPool(threads);

    Callable<Object>[] producers = new Callable[providers];
    Callable<Object>[] consumers = new Callable[providers];
    Callable<Object> producer = new Callable<Object>() {
        @Override
        public Object call() throws Exception {
            Provider p = mock(TYPES[RandomUtils.nextInt(5)]);
            registry.registerProvider(p);
            queue.add(p);
            return null;
        }
    };
    Callable<Object> consumer = new Callable<Object>() {
        @Override
        public Object call() throws Exception {
            Provider p = queue.take();
            registry.unregisterProvider(p);
            return null;
        }
    };

    Arrays.fill(producers, producer);
    Arrays.fill(consumers, consumer);

    List<Callable<Object>> tasks = new ArrayList<Callable<Object>>(providers * 2);
    tasks.addAll(Arrays.asList(producers));
    tasks.addAll(Arrays.asList(consumers));
    Collections.shuffle(tasks);

    System.out.println("Registering and unregistering " + providers + " providers");
    threadpool.invokeAll(tasks, 10, TimeUnit.SECONDS);

    // all producers and consumers should have run, we should be back at 0 providers registered
    assertEquals(0, registry.getProviders().size());
}

---

From source file:org.apache.eagle.jobrunning.crawler.RunningJobCrawlerImpl.java

public void addIntoProcessingQueueAndList(Set<JobContext> jobSet, BlockingQueue<JobContext> queue,
        ResourceType type) {//from  w  w  w .ja v a2  s .c  o m
    try {
        readWriteLock.writeLock().lock();
        LOG.info("Write lock acquired");
        List<String> processingList = zkStateManager.readProcessedJobs(type);
        processingList.addAll(extractJobList(type));
        for (JobContext context : jobSet) {
            String jobId = context.jobId;
            if (!processingList.contains(jobId)) {
                addIntoProcessingList(type, context);
                queue.add(context);
            }
        }
    } finally {
        try {
            readWriteLock.writeLock().unlock();
            LOG.info("Write lock released");
        } catch (Throwable t) {
            LOG.error("Fail to release Write lock", t);
        }
    }
}

---

From source file:eagle.jobrunning.crawler.RunningJobCrawlerImpl.java

public void addIntoProcessingQueueAndList(Set<String> jobIdSet, BlockingQueue<JobContext> queue,
        ResourceType type) {//from www . j  av a 2s .  com
    try {
        readWriteLock.writeLock().lock();
        LOG.info("Write lock acquired");
        List<String> processingList = zkStateManager.readProcessedJobs(type);
        processingList.addAll(extractJobList(type));
        for (String jobId : jobIdSet) {
            if (!processingList.contains(jobId)) {
                JobContext context = new JobContext(jobId, System.currentTimeMillis());
                addIntoProcessingList(type, context);
                queue.add(context);
            }
        }
    } finally {
        try {
            readWriteLock.writeLock().unlock();
            LOG.info("Write lock released");
        } catch (Throwable t) {
            LOG.error("Fail to release Write lock", t);
        }
    }
}

---

From source file:gridool.taskqueue.sender.SenderResponseTaskQueue.java

@Override
public void onResponse(@Nonnull GridTaskResponseMessage response) {
    final String jobId = response.getJobId();
    final GridNode senderNode = response.getSenderNode();
    final BlockingQueue<GridTaskResult> queue = queueMap.get(jobId);
    if (queue != null) {
        if (LOG.isDebugEnabled()) {
            LOG.debug("Received a GridTaskResponseMessage for a task: " + response.getTaskId() + " of Job ["
                    + jobId + "] that was executed on " + (senderNode == null ? "localhost" : senderNode));
        }//from  w ww . j av a2s . com
        byte[] resultBytes = response.getMessage();
        String deployGroup = response.getDeploymentGroup();
        ClassLoader ldr = registry.getDeploymentGroupClassLoader(deployGroup);
        final GridTaskResult result;
        try {
            result = marshaller.unmarshall(resultBytes, ldr);
        } catch (GridException e) {
            throw new IllegalStateException("failed to unmarshall message from node: " + senderNode, e);
        }
        queue.add(result);
    } else {
        LOG.error("SenderResponseQueue is not found for a task: " + response.getTaskId() + " of Job [" + jobId
                + "] that was executed on " + (senderNode == null ? "localhost" : senderNode));
    }
}

---

From source file:com.curecomp.primefaces.migrator.PrimefacesMigration.java

private static void findWidgetVarUsages(Path sourceFile, WidgetVarLocation widgetVarLocation,
        BlockingQueue<WidgetVarLocation> foundUsages, BlockingQueue<WidgetVarLocation> skippedUsages,
        BlockingQueue<WidgetVarLocation> unusedOrAmbiguous) throws IOException {
    try (BufferedReader br = Files.newBufferedReader(sourceFile, StandardCharsets.UTF_8)) {
        int lineNr = 0;
        String line;/*w  ww.  ja v a  2 s  . c o m*/
        while ((line = br.readLine()) != null) {
            lineNr++;

            int startIndex = 0;
            int endIndex = -1;

            while ((startIndex = line.indexOf(widgetVarLocation.widgetVar, endIndex + 1)) > -1) {
                endIndex = startIndex + widgetVarLocation.widgetVar.length();

                if (sourceFile.equals(widgetVarLocation.location) && lineNr == widgetVarLocation.lineNr
                        && startIndex == widgetVarLocation.columnNr) {
                    continue;
                }

                WidgetVarLocation usage = new WidgetVarLocation(widgetVarLocation.widgetVar, sourceFile, lineNr,
                        startIndex, line);

                // Only look at lines that use the word as a whole and not just as a part
                if ((startIndex == 0 || !Character.isJavaIdentifierStart(line.charAt(startIndex - 1)))
                        && (line.length() == endIndex
                                || !Character.isJavaIdentifierPart(line.charAt(endIndex)))) {
                    // We skip usages that occur as the last word of a line or usages that don't call methods directly
                    if (endIndex == line.length() || endIndex < line.length() && line.charAt(endIndex) != '.') {
                        skippedUsages.add(usage);
                    } else {
                        foundUsages.add(usage);
                    }
                } else {
                    skippedUsages.add(usage);
                }

                unusedOrAmbiguous.remove(widgetVarLocation);
            }
        }
    }
}

---

From source file:com.jbrisbin.vpc.jobsched.SubmitClosure.java

@Override
public Object call(Object[] args) {
    log.debug("args: " + args);
    String exch = args[0].toString();
    String route = args[1].toString();
    final Object body = args[2];
    Map headers = null;//w w  w  . j av a 2 s .  com

    final BlockingQueue<Object> resultsQueue = new LinkedBlockingQueue<Object>();
    Queue replyQueue = rabbitAdmin.declareQueue();
    SimpleMessageListenerContainer listener = new SimpleMessageListenerContainer();
    listener.setQueues(replyQueue);
    if (args.length > 3) {
        for (int i = 3; i <= args.length; i++) {
            if (args[i] instanceof MessageListener) {
                MessageListener callback = (MessageListener) args[3];
                listener.setMessageListener(callback);
            } else if (args[i] instanceof Map) {
                headers = (Map) args[i];
            }
        }
    } else {
        listener.setMessageListener(new MessageListener() {
            public void onMessage(Message message) {
                byte[] body = message.getBody();
                try {
                    resultsQueue.add(mapper.readValue(body, 0, body.length, Map.class));
                } catch (IOException e) {
                    log.error(e.getMessage(), e);
                }
            }
        });
    }

    final Map msgHdrs = headers;
    rabbitTemplate.send(exch, route, new MessageCreator() {
        public Message createMessage() {
            MessageProperties props = new RabbitMessageProperties();
            props.setContentType("application/json");
            if (null != msgHdrs) {
                props.getHeaders().putAll(msgHdrs);
            }
            String uuid = UUID.randomUUID().toString();
            props.setCorrelationId(uuid.getBytes());
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            try {
                mapper.writeValue(out, body);
            } catch (IOException e) {
                log.error(e.getMessage(), e);
            }
            Message msg = new Message(out.toByteArray(), props);
            return msg;
        }
    });

    Object results = null;
    try {
        results = resultsQueue.poll(5, TimeUnit.SECONDS);
    } catch (InterruptedException e) {
        log.error(e.getMessage(), e);
    }
    listener.stop();

    return results;
}

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