com.continuent.tungsten.replicator.thl.log
Class WriteLock

java.lang.Object
  com.continuent.tungsten.replicator.thl.log.WriteLock

public class WriteLock
extends java.lang.Object

This class implements a write locking mechanism by acquiring an exclusive lock on a named operating system file. The lock mechanism is used to prevent multiple processes from writing to disk logs.

Version:

1.0

Author:

Robert Hodges

Constructor Summary

WriteLock(java.io.File lockFile)
Instantiates the write lock instance.

Method Summary

boolean	acquire() Attempt to acquire write lock.
boolean	isLocked() Return true if the write lock is currently acquired exclusively.
void	release() Release the write lock.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

WriteLock

public WriteLock(java.io.File lockFile)
          throws ReplicatorException

Instantiates the write lock instance.

Parameters:

lockFile -

Throws:

ReplicatorException

Method Detail

acquire

public boolean acquire()
                throws ReplicatorException

Attempt to acquire write lock. This call is idempotent.

Returns:

true if lock successfully acquired

Throws:

ReplicatorException

isLocked

public boolean isLocked()

Return true if the write lock is currently acquired exclusively.

release

public void release()

Release the write lock. This call is idempotent.