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.

        final Lock runLock = new ReentrantLock();
        final Condition runCondition = runLock.newCondition();
        long start = System.currentTimeMillis();
        Runnable doNothing = new Runnable() {
            public void run() {
                runLock.lock();
                try {
                    runCondition.signal();
                } finally {
                    runLock.unlock();
                }

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            }
        };
        
        workqueue.schedule(doNothing, 5000);
        
        runLock.lock();
        try {
            runCondition.await();
        } finally {
            runLock.unlock();
        }

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  private void asyncSetState(final Collection<INews> news, final State state, final boolean affectEquivalentNews, final boolean force) throws PersistenceException {
    if (news.isEmpty())
      return;
    final NewsEventRunnable eventRunnable = new NewsEventRunnable();;
    final Lock setStateLock = new ReentrantLock();
    setStateLock.lock();
    final Condition condition = setStateLock.newCondition();
    fExecutorService.execute(new Runnable() {
      public void run() {
        Set<INews> changedNews = null;
        try {

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    fExecutorService.execute(new Runnable() {
      public void run() {
        Set<INews> changedNews = null;
        try {
          fWriteLock.lock();
          setStateLock.lock();


          if (affectEquivalentNews) {
            /*
             * Give extra 25% size to take into account news that have same guid or
             * link.

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        // TODO: manage lock per method and read or write lock !
        // for now, use only write lock


        // acquire lock
        Lock writeLock = this.lock.writeLock();
        writeLock.lock();


        try {
            value = m.invoke(bean, localCallRequest.getMethodArgs());
        } catch (IllegalArgumentException e) {
            ejbResponse.setRPCException(new RPCException(e));

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    StateChangeListener listener = new StateChangeListener()
    {


      public void stateChange(int newState, int oldState)
      {
        lock.lock();
        isIdle.signal();
        lock.unlock();
      }


    };

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    };
    this.addStateChangeListener(STATE_IDLE, listener);
    if (_state != STATE_IDLE)
      try
      {
        lock.lock();
        isIdle.await(t, TimeUnit.MILLISECONDS);
      }
      catch (InterruptedException e)
      {
        e.printStackTrace();

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    wsform._GO_BUTTON.addActionListener(new ActionListener()
    {


      public void actionPerformed(ActionEvent e)
      {
        lock.lock();
        cont.signal();
        lock.unlock();
      }


    });

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    });


    showStep("Click button to continue");


    // wait for continue button
    lock.lock();
    cont.await();
    lock.unlock();


    // get user data
    destination = wsform._INSTALL_FOLDER.getText();

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    public void testWithLocking() {
        ReentrantReadWriteLock readWriteLock = dhns.getReadWriteLock();
        Lock lock = readWriteLock.readLock();


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

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