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

java.util.concurrent.locks.Lock.tryLock()
pulate protected state } finally { lock.unlock(); } } else { // perform alternative actions }} This usage ensures that the lock is unlocked if it was acquired, and doesn't try to unlock if the lock was not acquired. @return {@code true} if the lock was acquired and{@code false} otherwise


        int totalLocked = 0;
        for(String path : _relativePaths) {
            ReadWriteLock lock = lockManager.obtainLock(path);
            final Lock rlock = lock.readLock();
            if(rlock.tryLock()) {
                localExecResources.add(new Pair<String, Lock>(path, rlock));
            } else {
                totalLocked++;
                final byte[] k = StringUtils.getBytes(path);
                final GridNodeValueCollector collector = new GridNodeValueCollector(_excludeNodeList);

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        int totalLocked = 0;
        for(String path : relativePaths) {
            ReadWriteLock lock = lockManager.obtainLock(path);
            final Lock rlock = lock.readLock();
            if(rlock.tryLock()) {
                localExecResources.add(new Pair<String, Lock>(path, rlock));
            } else {
                totalLocked++;
                final List<GridNode> replicatedNodes;
                try {

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         session = existing;
      }
      
      Lock lock = session.getLock();


      if (!lock.tryLock())
      {
         throw new java.rmi.RemoteException("Concurent calls on session object.");
      }
      
      try

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         return null;
      }
      
      Lock lock = session.getLock();
      
      if (!lock.tryLock())
      {
         throw new java.rmi.RemoteException("Concurent calls on session object.");
      }
      
      try

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   {
      PackagedSession session = this.getAppMap(appName).get(keyId);
      
      Lock lock = session.getLock();
      
      if (!lock.tryLock())
      {
         return Boolean.FALSE;
      }


      try

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      block = _store.loadBlock(blockId);


    try {
      Lock blockLock = block.getReadLock();
      
      blockLock.tryLock(_timeout, TimeUnit.MILLISECONDS);


      try {
        validateIndex(block);
        
        block.read();

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                                  boolean isOverride,
                                  Block block)
    throws IOException, SQLException, InterruptedException
  {
    Lock blockLock = block.getReadLock();
    blockLock.tryLock(_timeout, TimeUnit.MILLISECONDS);
      
    try {
      validateIndex(block);
        
      block.read();

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                                   boolean isOverride,
                                   Block block)
    throws IOException, SQLException, InterruptedException
  {
    Lock blockLock = block.getWriteLock();
    blockLock.tryLock(_timeout, TimeUnit.MILLISECONDS);
      
    try {
      block.read();
      
      validate(block);

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    Block block = readBlock(blockId);


    try {
      Lock lock = block.getReadLock();
      lock.tryLock(_blockLockTimeout, TimeUnit.MILLISECONDS);


      try {
        byte []blockBuffer = block.getBuffer();


        os.write(blockBuffer, blockOffset, length);

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    try {
      validate(block);
        
      Lock blockLock = block.getWriteLock();
      blockLock.tryLock(_timeout, TimeUnit.MILLISECONDS);


      try {
        split(parent, block);


        validate(block);

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