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.




    @Override
    public WebResourceRoot getResources() {
        Lock readLock = resourcesLock.readLock();
        readLock.lock();
        try {
            return resources;
        } finally {
            readLock.unlock();
        }

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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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     * therefore uses a lock to close the connection in a thread-safe manner.
     */
    private void closeConnection(String reason) throws AMQException
    {
        Lock receivedLock = _session.getReceivedLock();
        receivedLock.lock();
        try
        {
            _session.close(AMQConstant.RESOURCE_ERROR, reason);
        }
        finally

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      throw new RuntimeException(msg);
    }
    int srcIndex = 0, cnt = -1;
    for (int i = startBuffer; i <= endBuffer; ++i) {
      Lock lock = locks[i];
      lock.lock();
      try {
        ByteBuffer bb = buffers[i];
        if (i == startBuffer) {
          cnt = bufferSize - startOffset;
          if (cnt > len) cnt = len;

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            int i = -1;


            try {


                final Lock l1 = this.lock;
                l1.lock();


                try {
                    if (!KeepAliveServer.this.gzip) {
                        in = new BufferedInputStream(socket.getInputStream());
                        out = new BufferedOutputStream(socket.getOutputStream());

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                        break;
                    }
                    final KeepAliveStyle style = KeepAliveStyle.values()[i];


                    final Lock l2 = this.lock;
                    l2.lock();


                    try {


                        switch (style) {
                            case PING_PING: {

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        @SuppressWarnings("unchecked")
        public boolean add(final URI o) {


            final Lock lock = sync.writeLock();
            lock.lock();


            try {
                ClusterMetaData nextVersion = null;
                try {
                    if (set.add(o)) {

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            }
        }


        public boolean remove(final Object o) {
            final Lock lock = sync.writeLock();
            lock.lock();


            try {
                ClusterMetaData nextVersion = null;
                try {
                    if (set.remove(o)) {

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            return new ClusterMetaData(System.currentTimeMillis(), locations);
        }


        public ClusterMetaData current() {
            final Lock lock = sync.readLock();
            lock.lock();
            try {
                return current.get();
            } finally {
                lock.unlock();
            }

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