/**
*
* Copyright (c) 2014, the Railo Company Ltd. All rights reserved.
*
* 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/licenses/>.
*
**/
package lucee.commons.lock;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.ReentrantLock;
public class SimpleLock<L> implements Lock {
private ReentrantLock lock;
private L label;
public SimpleLock(L label) {
this.lock=new ReentrantLock(true);
this.label=label;
}
@Override
public void lock(long timeout) throws LockException {
if(timeout<=0) throw new LockException("timeout must be a postive number");
long initialTimeout=timeout;
long start=System.currentTimeMillis();
do{
try {
if(!lock.tryLock(timeout, TimeUnit.MILLISECONDS)){
throw new LockException(initialTimeout);
}
break; // exit loop
}
catch (InterruptedException e) {
timeout-=System.currentTimeMillis()-start;
}
if(timeout<=0) {
// Lucee was not able to aquire lock in time
throw new LockException(initialTimeout);
}
}
while(true);
}
@Override
public void unlock() {
lock.unlock();
}
@Override
public int getQueueLength() {
return lock.getQueueLength();
}
public L getLabel(){
return label;
}
}