/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.openjpa.slice;
import java.util.concurrent.locks.ReentrantLock;
/**
* A reentrant lock that lets a child to work with the parent's lock.
*
* @author Pinaki Poddar
*
*/
@SuppressWarnings("serial")
public class ReentrantSliceLock extends ReentrantLock {
public ReentrantSliceLock() {
}
public ReentrantSliceLock(boolean fair) {
super(fair);
}
/**
* Locks only for parent thread and let the child use parent's lock.
*/
@Override
public void lock() {
if (Thread.currentThread() instanceof SliceThread)
return;
super.lock();
}
/**
* Unlocks only if parent thread.
*/
@Override
public void unlock() {
if (Thread.currentThread() instanceof SliceThread)
return;
super.unlock();
}
}