Package org.apache.accumulo.fate.zookeeper

Examples of org.apache.accumulo.fate.zookeeper.DistributedReadWriteLock$WriteLock

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  private static Lock getLock(String tableId, long tid, boolean writeLock) throws Exception {
    byte[] lockData = String.format("%016x", tid).getBytes(Constants.UTF8);
    ZooQueueLock qlock = new ZooQueueLock(ZooUtil.getRoot(HdfsZooInstance.getInstance()) + Constants.ZTABLE_LOCKS + "/" + tableId, false);
    Lock lock = DistributedReadWriteLock.recoverLock(qlock, lockData);
    if (lock == null) {
      DistributedReadWriteLock locker = new DistributedReadWriteLock(qlock, lockData);
      if (writeLock)
        lock = locker.writeLock();
      else
        lock = locker.readLock();
    }
    return lock;
  }
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  private static Lock getLock(String tableId, long tid, boolean writeLock) throws Exception {
    byte[] lockData = String.format("%016x", tid).getBytes();
    ZooQueueLock qlock = new ZooQueueLock(ZooUtil.getRoot(HdfsZooInstance.getInstance()) + Constants.ZTABLE_LOCKS + "/" + tableId, false);
    Lock lock = DistributedReadWriteLock.recoverLock(qlock, lockData);
    if (lock == null) {
      DistributedReadWriteLock locker = new DistributedReadWriteLock(qlock, lockData);
      if (writeLock)
        lock = locker.writeLock();
      else
        lock = locker.readLock();
    }
    return lock;
  }
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    super(ZooReaderWriter.getRetryingInstance(), path, ephemeral);
  }
 
  public static void main(String args[]) throws InterruptedException, KeeperException {
    ZooQueueLock lock = new ZooQueueLock("/lock", true);
    DistributedReadWriteLock rlocker = new DistributedReadWriteLock(lock, "reader".getBytes());
    DistributedReadWriteLock wlocker = new DistributedReadWriteLock(lock, "wlocker".getBytes());
    final Lock readLock = rlocker.readLock();
    readLock.lock();
    final Lock readLock2 = rlocker.readLock();
    readLock2.lock();
    final Lock writeLock = wlocker.writeLock();
    if (writeLock.tryLock(100, TimeUnit.MILLISECONDS))
      throw new RuntimeException("Write lock achieved during read lock!");
    readLock.unlock();
    readLock2.unlock();
    writeLock.lock();
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  private static Lock getLock(String tableId, long tid, boolean writeLock) throws Exception {
    byte[] lockData = String.format("%016x", tid).getBytes(Constants.UTF8);
    ZooQueueLock qlock = new ZooQueueLock(ZooUtil.getRoot(HdfsZooInstance.getInstance()) + Constants.ZTABLE_LOCKS + "/" + tableId, false);
    Lock lock = DistributedReadWriteLock.recoverLock(qlock, lockData);
    if (lock == null) {
      DistributedReadWriteLock locker = new DistributedReadWriteLock(qlock, lockData);
      if (writeLock)
        lock = locker.writeLock();
      else
        lock = locker.readLock();
    }
    return lock;
  }
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  private static Lock getLock(String tableId, long tid, boolean writeLock) throws Exception {
    byte[] lockData = String.format("%016x", tid).getBytes(Constants.UTF8);
    ZooQueueLock qlock = new ZooQueueLock(ZooUtil.getRoot(HdfsZooInstance.getInstance()) + Constants.ZTABLE_LOCKS + "/" + tableId, false);
    Lock lock = DistributedReadWriteLock.recoverLock(qlock, lockData);
    if (lock == null) {
      DistributedReadWriteLock locker = new DistributedReadWriteLock(qlock, lockData);
      if (writeLock)
        lock = locker.writeLock();
      else
        lock = locker.readLock();
    }
    return lock;
  }
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    super(ZooReaderWriter.getRetryingInstance(), path, ephemeral);
  }
 
  public static void main(String args[]) throws InterruptedException, KeeperException {
    ZooQueueLock lock = new ZooQueueLock("/lock", true);
    DistributedReadWriteLock rlocker = new DistributedReadWriteLock(lock, "reader".getBytes(Constants.UTF8));
    DistributedReadWriteLock wlocker = new DistributedReadWriteLock(lock, "wlocker".getBytes(Constants.UTF8));
    final Lock readLock = rlocker.readLock();
    readLock.lock();
    final Lock readLock2 = rlocker.readLock();
    readLock2.lock();
    final Lock writeLock = wlocker.writeLock();
    if (writeLock.tryLock(100, TimeUnit.MILLISECONDS))
      throw new RuntimeException("Write lock achieved during read lock!");
    readLock.unlock();
    readLock2.unlock();
    writeLock.lock();
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