001/*
002 * The MIT License
003 * Copyright (c) 2012 Microsoft Corporation
004 *
005 * Permission is hereby granted, free of charge, to any person obtaining a copy
006 * of this software and associated documentation files (the "Software"), to deal
007 * in the Software without restriction, including without limitation the rights
008 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
009 * copies of the Software, and to permit persons to whom the Software is
010 * furnished to do so, subject to the following conditions:
011 *
012 * The above copyright notice and this permission notice shall be included in
013 * all copies or substantial portions of the Software.
014 *
015 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
016 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
017 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
018 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
019 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
020 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
021 * THE SOFTWARE.
022 */
023
024package microsoft.exchange.webservices.data.misc;
025
026import java.util.concurrent.ArrayBlockingQueue;
027import java.util.concurrent.Callable;
028import java.util.concurrent.ExecutorService;
029import java.util.concurrent.Future;
030import java.util.concurrent.RunnableFuture;
031import java.util.concurrent.ThreadPoolExecutor;
032import java.util.concurrent.TimeUnit;
033
034public class AsyncExecutor extends ThreadPoolExecutor implements ExecutorService {
035  final static ArrayBlockingQueue<Runnable> queue = new ArrayBlockingQueue<Runnable>(1);
036
037  public AsyncExecutor() {
038    super(1, 5, 10, TimeUnit.SECONDS, queue);
039  }
040
041  public <T> Future<T> submit(Callable<T> task, AsyncCallback callback) {
042    if (task == null) {
043      throw new NullPointerException();
044    }
045    RunnableFuture<T> ftask = newTaskFor(task);
046    execute(ftask);
047    if (callback != null) {
048      callback.setTask(ftask);
049    }
050    new Thread(callback).start();
051    return ftask;
052  }
053}