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/*
Wotonomy: OpenStep design patterns for pure Java applications.
Copyright (C) 2002 Israfil consulting Services Corporation
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see http://www.gnu.org
$Id: NSLock.java 893 2006-02-16 13:22:23Z cgruber $
*/
package net.wotonomy.foundation;
import EDU.oswego.cs.dl.util.concurrent.Mutex;
/**
* A simple mutually-exclusive lock. Currently an API-compliance subclass of an
* external Mutex class, conforming to the API and behavior of
* com.webobjects.foundation.NSLock. This class implements the NSLocking
* protocol (interface), and is implemented using Doug Lea's concurrent
* programming package.
*
* @author cgruber@israfil.net
* @author $Author: cgruber $
* @version $Revision: 893 $
*
*/
public class NSLock extends Mutex implements NSLocking {
public NSLock() {
}
@Override
public synchronized void lock() {
try {
acquire();
} catch (InterruptedException interruptedexception) {
notify();
}
}
@Override
public synchronized void unlock() {
release();
}
public synchronized boolean tryLock() {
return tryLock(0);
}
public synchronized boolean tryLock(long l) {
try {
return attempt(l);
} catch (InterruptedException interruptedexception) {
notify();
return false;
}
}
public boolean tryLock(NSTimestamp nstimestamp) {
return tryLock(nstimestamp.getTime() - System.currentTimeMillis());
}
@Override
public String toString() {
return getClass().getName() + " <" + (inuse_ ? "Locked" : "Unlocked") + ">";
}
public synchronized boolean isLocked() {
return inuse_;
}
}
/*
* $Log$ Revision 1.2 2006/02/16 13:15:00 cgruber Check in all sources in
* eclipse-friendly maven-enabled packages.
*
* Revision 1.1 2002/07/14 21:56:16 mpowers Contributions from cgruber.
*
* Revision 1.4 2002/06/25 19:03:02 cgruber Internal documentation fixes.
*
* Revision 1.3 2002/06/25 18:52:56 cgruber Fix javadocs that resulted from bad
* cut-and-paste of the boilerplate.
*
* Revision 1.2 2002/06/25 17:45:52 cgruber Add implementation of NSLock using
* Doug Lea's concurrent programming APIs.
*
* Revision 1.1 2002/06/25 07:52:57 cgruber Add quite a few abstract classes,
* interfaces, and classes. All API consistent with WebObjects, but with no
* implementation, nor any private or package access members from the original.
*
*/
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