Examples of java.util.concurrent.locks.Lock.lock()

java.util.concurrent.locks.Lock.lock()
Acquires the lock.
If the lock is not available then the current thread becomes disabled for thread scheduling purposes and lies dormant until the lock has been acquired.
Implementation Considerations
A {@code Lock} implementation may be able to detect erroneous useof the lock, such as an invocation that would cause deadlock, and may throw an (unchecked) exception in such circumstances. The circumstances and the exception type must be documented by that {@code Lock} implementation.

    @Test
    public void testWithGlobalLocking() {
        ReentrantReadWriteLock readWriteLock = dhns.getReadWriteLock();
        Lock lock = readWriteLock.readLock();


        lock.lock();
        for (int i = 0; i < 100000; i++) {
            lock.lock();
            int degree = singleNode.getEdgesInTree().getCount() + singleNode.getEdgesOutTree().getCount();
            lock.unlock();
        }

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        ReentrantReadWriteLock readWriteLock = dhns.getReadWriteLock();
        Lock lock = readWriteLock.readLock();


        lock.lock();
        for (int i = 0; i < 100000; i++) {
            lock.lock();
            int degree = singleNode.getEdgesInTree().getCount() + singleNode.getEdgesOutTree().getCount();
            lock.unlock();
        }
        lock.unlock();
    }

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    if (i == batchSize) {
      sinkCounter.incrementBatchCompleteCount();
    }
    sinkCounter.addToEventDrainAttemptCount(i);


    lock.lock();
    try {
      while ((callbacksReceived.get() < callbacksExpected.get())
              && !txnFail.get()) {
        try {
          if(!condition.await(timeout, TimeUnit.MILLISECONDS)){

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        String personId = validateWriteRequest(userId, groupId, appId, token);


        //lock on this user and this application to avoid any potential concurrency issues
        Lock lock = getApplicationDataLock(personId, appId);
        try {
            lock.lock();


            //get the application data for this user and application
            ApplicationData applicationData = applicationDataRepository.getApplicationData(personId, appId);


            //if there is no data, there's nothing to delete, so we're done...

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        String personId = validateWriteRequest(userId, groupId, appId, token);


        //lock on this user and this application to avoid any potential concurrency issues
        Lock lock = getApplicationDataLock(personId, appId);
        try {
            lock.lock();
            //get the application data for this user and application
            ApplicationData applicationData = applicationDataRepository.getApplicationData(personId, appId);


            //if there is no data, create an empty object to store the data in that we'll save when we're done
            if (applicationData == null) {

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            for (int i=0; i<3; i++) {
                if (i > 0)
                    Thread.sleep(333); // don't go too fast


                try {
                    lck.lock();
                    cnd.signalAll(); // this is the spurious wakeup
                } finally {
                    lck.unlock();
                }

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        Thread.sleep(500); // just for fun, let it wait for some time
        // this may fail due to a spurious wakeup
        assertTrue("thread not waiting, spurious wakeup?", ath.isWaiting());


        try {
            lck.lock();
            wt.wakeup();
        } finally {
            lck.unlock();
        }
        ath.join(10000);

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        Lock      lck = new ReentrantLock();
        Condition cnd = lck.newCondition();
        WaitingThread wt = new WaitingThread(cnd, null);


        try {
            lck.lock();
            wt.wakeup();
            fail("missing waiter not detected");
        } catch (IllegalStateException isx) {
            // expected
        } finally {

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    @Override
    public void setResources(WebResourceRoot resources) {


        Lock writeLock = resourcesLock.writeLock();
        writeLock.lock();
        WebResourceRoot oldResources = null;
        try {
            if (getState().isAvailable()) {
                throw new IllegalStateException
                    (sm.getString("standardContext.resources.started"));

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    public boolean resourcesStop() {


        boolean ok = true;


        Lock writeLock = resourcesLock.writeLock();
        writeLock.lock();
        try {
            if (resources != null) {
                resources.stop();
            }
        } catch (Throwable t) {

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