Java Doc for WriterPreferenceReadWriteLock.java in  » Database-JDBC-Connection-Pool » proxool » org » logicalcobwebs » concurrent » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database JDBC Connection Pool » proxool » org.logicalcobwebs.concurrent 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.logicalcobwebs.concurrent.WriterPreferenceReadWriteLock

All known Subclasses:   org.logicalcobwebs.concurrent.ReaderPreferenceReadWriteLock,
WriterPreferenceReadWriteLock
public class WriterPreferenceReadWriteLock implements ReadWriteLock(Code)
A ReadWriteLock that prefers waiting writers over waiting readers when there is contention. This class is adapted from the versions described in CPJ, improving on the ones there a bit by segregating reader and writer wait queues, which is typically more efficient.

The locks are NOT reentrant. In particular, even though it may appear to usually work OK, a thread holding a read lock should not attempt to re-acquire it. Doing so risks lockouts when there are also waiting writers.

[ Introduction to this package. ]


Inner Class :abstract protected class Signaller
Inner Class :protected class ReaderLock extends Signaller implements Sync
Inner Class :protected class WriterLock extends Signaller implements Sync

Field Summary
protected  longactiveReaders_
    
protected  ThreadactiveWriter_
    
final protected  ReaderLockreaderLock_
    
protected  longwaitingReaders_
    
protected  longwaitingWriters_
    
final protected  WriterLockwriterLock_
    


Method Summary
protected  booleanallowReader()
    
protected synchronized  voidcancelledWaitingReader()
    
protected synchronized  voidcancelledWaitingWriter()
    
protected synchronized  SignallerendRead()
     Called upon termination of a read.
protected synchronized  SignallerendWrite()
     Called upon termination of a write.
public  SyncreadLock()
    
protected synchronized  booleanstartRead()
    
protected synchronized  booleanstartReadFromNewReader()
    
protected synchronized  booleanstartReadFromWaitingReader()
    
protected synchronized  booleanstartWrite()
    
protected synchronized  booleanstartWriteFromNewWriter()
    
protected synchronized  booleanstartWriteFromWaitingWriter()
    
public  SyncwriteLock()
    

Field Detail
activeReaders_
protected long activeReaders_(Code)



activeWriter_
protected Thread activeWriter_(Code)



readerLock_
final protected ReaderLock readerLock_(Code)



waitingReaders_
protected long waitingReaders_(Code)



waitingWriters_
protected long waitingWriters_(Code)



writerLock_
final protected WriterLock writerLock_(Code)





Method Detail
allowReader
protected boolean allowReader()(Code)
Override this method to change to reader preference *



cancelledWaitingReader
protected synchronized void cancelledWaitingReader()(Code)



cancelledWaitingWriter
protected synchronized void cancelledWaitingWriter()(Code)



endRead
protected synchronized Signaller endRead()(Code)
Called upon termination of a read. Returns the object to signal to wake up a waiter, or null if no such



endWrite
protected synchronized Signaller endWrite()(Code)
Called upon termination of a write. Returns the object to signal to wake up a waiter, or null if no such



readLock
public Sync readLock()(Code)



startRead
protected synchronized boolean startRead()(Code)



startReadFromNewReader
protected synchronized boolean startReadFromNewReader()(Code)



startReadFromWaitingReader
protected synchronized boolean startReadFromWaitingReader()(Code)



startWrite
protected synchronized boolean startWrite()(Code)



startWriteFromNewWriter
protected synchronized boolean startWriteFromNewWriter()(Code)



startWriteFromWaitingWriter
protected synchronized boolean startWriteFromWaitingWriter()(Code)



writeLock
public Sync writeLock()(Code)



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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