org.ws4d.java.concurrency
Class LockSupport

java.lang.Object
  org.ws4d.java.concurrency.LockSupport

All Implemented Interfaces:

Lockable

public class LockSupport
extends java.lang.Object
implements Lockable

Implementation of a multiple-readers/single-writer lock support.

Constructor Summary

LockSupport()
Constructs a new LockSupport.

Method Summary

void	exclusiveLock() Acquires an exclusive lock.
boolean	releaseExclusiveLock() Releases an exclusive lock of the current thread.
void	releaseSharedLock() Releases a shared lock of the current thread.
void	sharedLock() Acquires a shared lock.
java.lang.String	toString()
boolean	tryExclusiveLock() Try to get an exclusive lock immediately.
boolean	trySharedLock() Tries to get a shared lock immediately.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

LockSupport

public LockSupport()

Constructs a new LockSupport.

Method Detail

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

sharedLock

public void sharedLock()

Description copied from interface: Lockable

Acquires a shared lock. If the lock cannot be allocated immediately, the thread is blocked until allocation is possible.

Specified by:

sharedLock in interface Lockable

exclusiveLock

public void exclusiveLock()

Description copied from interface: Lockable

Acquires an exclusive lock. If the lock cannot be allocated immediately, the thread is blocked until allocation is possible.

Specified by:

exclusiveLock in interface Lockable

trySharedLock

public boolean trySharedLock()

Description copied from interface: Lockable

Tries to get a shared lock immediately.

Specified by:

trySharedLock in interface Lockable

Returns:

true if the lock has been allocated, false otherwise

tryExclusiveLock

public boolean tryExclusiveLock()

Description copied from interface: Lockable

Try to get an exclusive lock immediately.

Specified by:

tryExclusiveLock in interface Lockable

Returns:

true if the lock has been allocated, false otherwise

releaseSharedLock

public void releaseSharedLock()

Description copied from interface: Lockable

Releases a shared lock of the current thread.

Specified by:

releaseSharedLock in interface Lockable

releaseExclusiveLock

public boolean releaseExclusiveLock()

Description copied from interface: Lockable

Releases an exclusive lock of the current thread.

Specified by:

releaseExclusiveLock in interface Lockable

Returns:

true = if last exclusive lock of this thread is released.