Example usage for java.lang Thread yield

Introduction

In this page you can find the example usage for java.lang Thread yield.

Prototype

public static native void yield();

Source Link

Document

A hint to the scheduler that the current thread is willing to yield its current use of a processor.

Usage

From source file:axiom.util.Logging.java

/**
 * Shut down logging, stopping the logger thread and closing all logs.
 *///from   w  w  w . j  a  va 2 s. c  om
public synchronized static void shutdown() {
    if (runner != null && runner.isAlive()) {
        runner.interrupt();
    }
    runner = null;
    Thread.yield();
    closeAll();
}

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From source file:com.espertech.esper.epl.named.NamedWindowConsumerLatchSpin.java

/**
 * Blocking call that returns only when the earlier latch completed.
 * @return unit of the latch//  ww w  .  j a  v  a  2s.  c om
 */
public void await() {
    if (earlier.isCompleted) {
        currentThread = Thread.currentThread();
        return;
    }

    if (earlier.getCurrentThread() == Thread.currentThread()) {
        currentThread = Thread.currentThread();
        return;
    }

    long spinStartTime = factory.getTimeSourceService().getTimeMillis();
    while (!earlier.isCompleted) {
        Thread.yield();
        long spinDelta = factory.getTimeSourceService().getTimeMillis() - spinStartTime;
        if (spinDelta > factory.getMsecWait()) {
            log.info("Spin wait timeout exceeded in named window '" + factory.getName()
                    + "' consumer dispatch at " + factory.getMsecWait() + "ms for " + factory.getName()
                    + ", consider disabling named window consumer dispatch latching for better performance");
            break;
        }
    }
}

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From source file:org.stanwood.podcaster.util.StreamGobbler.java

/**
 * Used to mark the stream has done and block till it's not running
 *///from  w w w . ja  v  a 2  s  .c o m
@Override
public void done() {
    done = true;
    // Block until it finishes
    while (running) {
        Thread.yield();
    }
}

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From source file:org.apache.hadoop.metrics2.impl.TestSinkQueue.java

/**
 * Test blocking when queue is empty/*from www.ja v  a 2 s.c  o m*/
 * @throws Exception
 */
@Test
public void testEmptyBlocking() throws Exception {
    final SinkQueue<Integer> q = new SinkQueue<Integer>(2);
    final Runnable trigger = mock(Runnable.class);
    // try consuming emtpy equeue and blocking
    Thread t = new Thread() {
        @Override
        public void run() {
            try {
                assertEquals("element", 1, (int) q.dequeue());
                q.consume(new Consumer<Integer>() {
                    public void consume(Integer e) {
                        assertEquals("element", 2, (int) e);
                        trigger.run();
                    }
                });
            } catch (InterruptedException e) {
                LOG.warn("Interrupted", e);
            }
        }
    };
    t.start();
    Thread.yield(); // Let the other block
    q.enqueue(1);
    q.enqueue(2);
    t.join();
    verify(trigger).run();
}

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From source file:org.archive.util.CachedBdbMapTest.java

@SuppressWarnings("unchecked")
public void xestReadConsistencyUnderLoad() throws Exception {
    final CachedBdbMap<String, AtomicInteger> cbdbmap = new CachedBdbMap(this.envDir, this.getClass().getName(),
            Integer.class, AtomicInteger.class);
    try {//from  w  ww. j a va 2s.  co m
        final AtomicInteger level = new AtomicInteger(0);
        final int keyCount = 128 * 1024; // 128K  keys
        final int maxLevel = 64;
        // initial fill
        for (int i = 0; i < keyCount; i++) {
            AtomicInteger prevVal = cbdbmap.putIfAbsent("" + i, new AtomicInteger(level.get()));
            assertNull("unexpected prior value", prevVal);
        }
        // backward checking that all values always at level or higher
        new Thread() {
            public void run() {
                untilmax: while (true) {
                    for (int j = keyCount - 1; j >= 0; j--) {
                        int targetValue = level.get();
                        if (targetValue >= maxLevel) {
                            break untilmax;
                        }
                        assertTrue("stale value revseq key " + j, cbdbmap.get(j).get() >= targetValue);
                        Thread.yield();
                    }
                }
            }
        }.start();
        // random checking that all values always at level or higher
        new Thread() {
            public void run() {
                untilmax: while (true) {
                    int j = RandomUtils.nextInt(keyCount);
                    int targetValue = level.get();
                    if (targetValue >= maxLevel) {
                        break untilmax;
                    }
                    assertTrue("stale value random key " + j, cbdbmap.get("" + j).get() >= targetValue);
                    Thread.yield();
                }
            }
        }.start();
        // increment all keys
        for (; level.get() < maxLevel; level.incrementAndGet()) {
            for (int k = 0; k < keyCount; k++) {
                int foundValue = cbdbmap.get("" + k).getAndIncrement();
                assertEquals("stale value preinc key " + k, level.get(), foundValue);
            }
            if (level.get() % 10 == 0) {
                System.out.println("level to " + level.get());
            }
            Thread.yield();
        }
    } finally {
        cbdbmap.close();
    }
    // SUCCESS
}

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From source file:org.openhab.binding.fibaro.internal.InMemoryCache.java

@SuppressWarnings("unchecked")
public void cleanup() {

    long now = System.currentTimeMillis();
    ArrayList<K> deleteKey = null;

    synchronized (crunchifyCacheMap) {
        MapIterator itr = crunchifyCacheMap.mapIterator();

        deleteKey = new ArrayList<K>((crunchifyCacheMap.size() / 2) + 1);
        K key;//from  ww w .j ava  2 s  .c  om
        CacheObject c;

        while (itr.hasNext()) {
            key = (K) itr.next();
            c = (CacheObject) itr.getValue();

            if (c != null && (now > (timeToLive + c.lastAccessed))) {
                deleteKey.add(key);
            }
        }
    }

    for (K key : deleteKey) {
        synchronized (crunchifyCacheMap) {
            crunchifyCacheMap.remove(key);
        }

        Thread.yield();
    }
}

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From source file:com.ottogroup.bi.asap.server.emitter.kafka.KafkaTopicPartitionConsumer.java

/**
 * @see java.lang.Runnable#run()/*from ww w .  java2 s .  co m*/
 */
public void run() {

    ConsumerIterator<byte[], byte[]> topicPartitionStreamIterator = this.kafkaTopicPartitionStream.iterator();

    this.running = true;
    // ensure that the partition iterator still has some elements left and the receiving
    // web socket producer still wants more
    while (running) {
        if (topicPartitionStreamIterator.hasNext()) {
            // next message must neither be null nor empty
            MessageAndMetadata<byte[], byte[]> message = topicPartitionStreamIterator.next();
            if (message != null && message.message() != null && message.message().length > 0) {
                // try to convert the content into a UTF-8 encoded string
                String messageContent = new String(message.message(), CharsetUtil.UTF_8);

                // return only if the message is not empty or blank
                // as we do not transport sender references it is forwarded with a reference to a dead letter box
                if (StringUtils.isNotBlank(messageContent)) {
                    messages.add(new StreamingDataMessage(origin, messageContent, System.currentTimeMillis()));
                }
            }
        } else {
            Thread.yield();
            // TODO wait strategy
        }
    }
}

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From source file:com.auditbucket.registration.service.TagService.java

public Collection<TagInputBean> processTags(final Company company, final List<TagInputBean> tagInputs) {
    //schemaDao.ensureUniqueIndexes(company, tagInputs);
    Future<Collection<TagInputBean>> future = makeTags(company, tagInputs);
    while (!future.isDone())
        Thread.yield();
    try {/*w w  w  . j  a v a2  s. c o  m*/
        return future.get();
    } catch (InterruptedException | ExecutionException e) {
        logger.error("Processing tags", e);
    }
    return null;
}

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From source file:ThreadDemo.java

/** This is the dummy method our threads all call */
static synchronized void compute() {
    // Figure out how many times we've been called by the current thread
    Integer n = (Integer) numcalls.get();
    if (n == null)
        n = new Integer(1);
    else/*from w ww  .j  a  v a2  s.  co m*/
        n = new Integer(n.intValue() + 1);
    numcalls.set(n);

    // Display the name of the thread, and the number of times called
    System.out.println(Thread.currentThread().getName() + ": " + n);

    // Do a long computation, simulating a "compute-bound" thread
    for (int i = 0, j = 0; i < 1000000; i++)
        j += i;

    // Alternatively, we can simulate a thread subject to network or I/O
    // delays by causing it to sleep for a random amount of time:
    try {
        // Stop running for a random number of milliseconds
        Thread.sleep((int) (Math.random() * 100 + 1));
    } catch (InterruptedException e) {
    }

    // Each thread politely offers the other threads a chance to run.
    // This is important so that a compute-bound thread does not "starve"
    // other threads of equal priority.
    Thread.yield();
}

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From source file:org.sonatype.nexus.testsuite.p2.nxcm1995.NXCM1995MetadataCacheIT.java

@Test
@Ignore//from www  . ja va 2  s.  c  om
public void test() throws Exception {
    // check original content
    final File f1 = downloadFile(new URL(getNexusTestRepoUrl() + "/content.xml"),
            "target/downloads/nxcm1995/1/content.xml");
    assertThat(f1, exists());
    assertThat(f1, contains("com.adobe.flexbuilder.utils.osnative.win"));
    assertThat(f1, not(contains("com.sonatype.nexus.p2.its.feature2.feature.jar")));

    // check original artifact
    final File a1 = downloadFile(new URL(getNexusTestRepoUrl() + "/artifacts.xml"),
            "target/downloads/nxcm1995/1/artifacts.xml");
    assertThat(a1, exists());
    assertThat(a1, contains("com.adobe.flexbuilder.multisdk"));
    assertThat(a1, not(contains("com.sonatype.nexus.p2.its.feature2")));

    final File reponxcm1995 = new File(localStorageDir, "nxcm1995");

    // check new content
    final File newContentXml = new File(localStorageDir, "p2repo2/content.xml");
    assertThat(newContentXml, exists());
    assertThat(newContentXml, not(contains("com.adobe.flexbuilder.utils.osnative.win")));
    assertThat(newContentXml, contains("com.sonatype.nexus.p2.its.feature2.feature.jar"));
    FileUtils.copyFileToDirectory(newContentXml, new File(reponxcm1995, "memberrepo1"), false);
    FileUtils.copyFileToDirectory(newContentXml, new File(reponxcm1995, "memberrepo2"), false);

    final File newArtifactsXml = new File(localStorageDir, "p2repo2/artifacts.xml");
    assertThat(newArtifactsXml, exists());
    FileUtils.copyFileToDirectory(newArtifactsXml, new File(reponxcm1995, "memberrepo1"), false);
    FileUtils.copyFileToDirectory(newArtifactsXml, new File(reponxcm1995, "memberrepo2"), false);

    // metadata cache expires in ONE minute, so let's give it some time to expire
    Thread.yield();
    Thread.sleep(1 * 60 * 1000);
    Thread.yield();
    Thread.sleep(1 * 60 * 1000);
    Thread.yield();

    // ScheduledServicePropertyResource prop = new ScheduledServicePropertyResource();
    // prop.setId( "repositoryId" );
    // prop.setValue( REPO );
    // TaskScheduleUtil.runTask( ExpireCacheTaskDescriptor.ID, prop );
    // TaskScheduleUtil.waitForAllTasksToStop();

    // make sure nexus has the right content after metadata cache expires
    final File f2 = downloadFile(new URL(getNexusTestRepoUrl() + "/content.xml"),
            "target/downloads/nxcm1995/2/content.xml");
    assertThat(f2, exists());
    assertThat(f2, not(contains("com.adobe.flexbuilder.utils.osnative.win")));
    assertThat(f2, contains("com.sonatype.nexus.p2.its.feature2.feature.jar"));

    assertThat(FileTestingUtils.compareFileSHA1s(f1, f2), is(false));

    // make sure nexus has the right content after metadata cache expires
    final File a2 = downloadFile(new URL(getNexusTestRepoUrl() + "/artifacts.xml"),
            "target/downloads/nxcm1995/2/artifacts.xml");
    assertThat(a2, exists());
    assertThat(a2, not(contains("com.adobe.flexbuilder.multisdk")));
    assertThat(a2, contains("com.sonatype.nexus.p2.its.feature2"));

    assertThat(FileTestingUtils.compareFileSHA1s(a1, a2), is(false));
}

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