| /* |
| * 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 <em>slice</em> 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; |
| public Thread newThread(Runnable r) { |
| Thread parent = Thread.currentThread(); |
| return new SliceThread(parent.getName()+"-slice-"+n++, parent, r); |
| } |
| } |
| } |