org.javagroups.util
Class RWLock

java.lang.Object
  |
  +--org.javagroups.util.RWLock

public class RWLock

extends java.lang.Object

Lock allowing multiple reads or a single write. Waiting writes have priority over new reads.

Code derived from com.sun.jini.thread.ReadersWriter, Jini 1.1, Sun Microsystems

Nested Class Summary

static class	RWLock.BlockException Exception thrown when a lock request would block the caller
static class	RWLock.IntException Interrupted exception wrapped in a RuntimeException

Constructor Summary

RWLock()

Method Summary

void	readLock() Obtain a read lock
void	readLockNoBlock() Obtain the read lock immediatelly or throw an exception if an attempt to get the read lock would block this call
void	readUnlock() Revoke the read lock
void	writeLock() Obtain a write lock
void	writeLockNoBlock() Obtain the write lock immediatelly or throw an exception if an attempt to get the write lock would block this call
void	writeUnlock() Revoke the write lock

Methods inherited from class java.lang.Object

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

Constructor Detail

RWLock

public RWLock()

Method Detail

readLock

public void readLock()

Obtain a read lock

Throws:

RWLock.IntException - if interrupted while waiting on the lock

readUnlock

public void readUnlock()

Revoke the read lock

readLockNoBlock

public void readLockNoBlock()
                     throws RWLock.BlockException

Obtain the read lock immediatelly or throw an exception if an attempt to get the read lock would block this call

Throws:

RWLock.BlockException - if attempt to get the read lock would block this call

writeLock

public void writeLock()

Obtain a write lock

Throws:

RWLock.IntException - if interrupted while waiting on the lock

writeUnlock

public void writeUnlock()

Revoke the write lock

writeLockNoBlock

public void writeLockNoBlock()
                      throws RWLock.BlockException

Obtain the write lock immediatelly or throw an exception if an attempt to get the write lock would block this call

Throws:

RWLock.BlockException - if attempt to get the write lock would block this call