/*
File: ReaderPreferenceReadWriteLock.java
Originally written by Doug Lea and released into the public domain.
This may be used for any purposes whatsoever without acknowledgment.
Thanks for the assistance and support of Sun Microsystems Labs,
and everyone contributing, testing, and using this code.
History:
Date Who What
11Jun1998 dl Create public version
*/
package com.alipay.zdal.datasource.resource.util.concurrent;
/**
* A ReadWriteLock that prefers waiting readers over
* waiting writers when there is contention. The range of applicability
* of this class is very limited. In the majority of situations,
* writer preference locks provide more reasonable semantics.
*
* <p>[<a href="http://gee.cs.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/concurrent/intro.html"> Introduction to this package. </a>]
**/
public class ReaderPreferenceReadWriteLock extends WriterPreferenceReadWriteLock {
@Override
protected boolean allowReader() {
return activeWriter_ == null;
}
}