NonBlockingWriterLock (JBossCache API) - JBoss 4.0.1 sp1 Cache API Documentation 英文版文档

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org.jboss.cache.lock
Class NonBlockingWriterLock

java.lang.Object
  org.jboss.cache.lock.ReadWriteLockWithUpgrade
      org.jboss.cache.lock.NonBlockingWriterLock

All Implemented Interfaces:: EDU.oswego.cs.dl.util.concurrent.ReadWriteLock

public class NonBlockingWriterLock
extends ReadWriteLockWithUpgrade

NonBlockingWriterLock is a read/write lock (with upgrade) that has non-blocking write lock acquisition on existing read lock(s).

Note that the write lock is exclusive among write locks, e.g., only one write lock can be granted at one time, but the write lock is independent of the read locks. For example, a read lock to be acquired will be blocked if there is existing write lock, but will not be blocked if there are mutiple read locks already granted to other owners. On the other hand, a write lock can be acquired as long as there is no existing write lock, regardless how many read locks have been granted.

Version:: $Id: NonBlockingWriterLock.java,v 1.3 2004/03/19 06:31:16 bwang00 Exp $
Author:: Ben Wang

Nested Class Summary

Nested classes inherited from class org.jboss.cache.lock.ReadWriteLockWithUpgrade

ReadWriteLockWithUpgrade.ReaderLock, ReadWriteLockWithUpgrade.Signaller, ReadWriteLockWithUpgrade.WriterLock

Field Summary

protected static org.jboss.logging.Logger log_


Fields inherited from class org.jboss.cache.lock.ReadWriteLockWithUpgrade

activeReaders_, activeWriter_, dummy_, readerLock_, sem_, upgraderLocal_, waitingReaders_, waitingUpgrader_, waitingWriters_, writerLock_

Constructor Summary

NonBlockingWriterLock()


Method Summary

protected boolean startWrite()


Methods inherited from class org.jboss.cache.lock.ReadWriteLockWithUpgrade

allowReader, cancelledWaitingReader, cancelledWaitingWriter, changeLock, endRead, endWrite, log, readLock, startRead, startReadFromNewReader, startReadFromWaitingReader, startWriteFromNewWriter, startWriteFromWaitingWriter, upgradeLockAttempt, writeLock

Methods inherited from class java.lang.Object

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

Field Detail

log_

protected static org.jboss.logging.Logger log_

Constructor Detail