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    
024    package microsoft.exchange.webservices.data.misc;
025    
026    import java.util.concurrent.ArrayBlockingQueue;
027    import java.util.concurrent.Callable;
028    import java.util.concurrent.ExecutorService;
029    import java.util.concurrent.Future;
030    import java.util.concurrent.RunnableFuture;
031    import java.util.concurrent.ThreadPoolExecutor;
032    import java.util.concurrent.TimeUnit;
033    
034    public 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    }