org.apache.openjpa.slice.SliceThread Maven / Gradle / Ivy
/*
* 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.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
/**
* A thread to execute operation against each database slice.
*
* @author Pinaki Poddar
*
*/
public class SliceThread extends Thread {
private final Thread _parent;
private static ExecutorService _pool;
public SliceThread(String name, Thread parent, Runnable r) {
super(r, name);
_parent = parent;
}
public SliceThread(Thread parent, Runnable r) {
super(r);
_parent = parent;
}
/**
* Gets the parent thread of this receiver.
*
*/
public Thread getParent() {
return _parent;
}
/**
* Create a cached pool of slice threads.
* The thread factory creates specialized threads for preferential locking treatment.
*
*/
public static ExecutorService getPool() {
if (_pool == null) {
_pool = Executors.newCachedThreadPool(new SliceThreadFactory());
}
return _pool;
}
private static class SliceThreadFactory implements ThreadFactory {
int n = 0;
@Override
public Thread newThread(Runnable r) {
Thread parent = Thread.currentThread();
return new SliceThread(parent.getName()+"-slice-"+n++, parent, r);
}
}
}