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Java Source Code / Java Documentation » Search Engine » Jofti » com.jofti.cache   Source Cross Reference   Class Diagram   Java Document (Java Doc)   java.lang.Object    com.jofti.cache.QueryUpdateLock QueryUpdateLock public class QueryUpdateLock (Code) This is an adaptation of Doug Lea's ReaderWriter lock to allow effectively two groups of readers. Any number of readers in one of the groups can be share one lock, but only one group of readers can be active at once. The difference is that the writer lock (which was a single entry) now behaves like a read lock but without the single access restriction. author:    xenephon (xenephon@jofti.com) Inner Class :protected class WriterLock extends Signaller implements Sync Inner Class :protected class ReaderLock extends Signaller implements Sync Inner Class :abstract protected class Signaller Field Summary protected  long activeReaders_      protected  long activeWriters_      final protected  ReaderLock readerLock_      protected  long waitingReaders_      protected  long waitingWriters_      final protected  WriterLock writerLock_      Constructor Summary public   QueryUpdateLock()      Method Summary protected  boolean allowReader()      protected  boolean allowWriters()      protected synchronized  void cancelledWaitingReader()      protected synchronized  void cancelledWaitingWriter()      protected synchronized  Signaller endRead()      protected synchronized  Signaller endWrite()      public  Sync queryLock()      protected synchronized  boolean startRead()      protected synchronized  boolean startReadFromNewReader()      protected synchronized  boolean startReadFromWaitingReader()      protected synchronized  boolean startWrite()      protected synchronized  boolean startWriteFromNewWriter()      protected synchronized  boolean startWriteFromWaitingWriter()      public  Sync updateLock()      Field Detail activeReaders_ protected long activeReaders_(Code) activeWriters_ protected long activeWriters_(Code) readerLock_ final protected ReaderLock readerLock_(Code) waitingReaders_ protected long waitingReaders_(Code) waitingWriters_ protected long waitingWriters_(Code) writerLock_ final protected WriterLock writerLock_(Code) Constructor Detail QueryUpdateLock public QueryUpdateLock()(Code) Method Detail allowReader protected boolean allowReader()(Code) allowWriters protected boolean allowWriters()(Code) cancelledWaitingReader protected synchronized void cancelledWaitingReader()(Code) cancelledWaitingWriter protected synchronized void cancelledWaitingWriter()(Code) endRead protected synchronized Signaller endRead()(Code) endWrite protected synchronized Signaller endWrite()(Code) queryLock public Sync queryLock()(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) updateLock public Sync updateLock()(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)