001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.servicemix.executors.impl;
018    
019    import java.util.concurrent.BlockingQueue;
020    import java.util.concurrent.ThreadPoolExecutor;
021    import java.util.concurrent.TimeUnit;
022    
023    import org.apache.servicemix.executors.Executor;
024    
025    /**
026     * The default Executor implementation which uses a 
027     * ThreadPoolExecutor underneath.
028     * 
029     * @author <a href="mailto:gnodet [at] gmail.com">Guillaume Nodet</a>
030     */
031    public class ExecutorImpl implements Executor {
032    
033        private final ThreadPoolExecutor threadPool;
034    
035        private final long shutdownDelay;
036    
037        public ExecutorImpl(ThreadPoolExecutor threadPool, long shutdownDelay) {
038            this.threadPool = threadPool;
039            this.shutdownDelay = shutdownDelay;
040        }
041    
042        public void execute(Runnable command) {
043            threadPool.execute(command);
044        }
045    
046        public void shutdown() {
047            threadPool.shutdown();
048            if (!threadPool.isTerminated() && shutdownDelay > 0) {
049                new Thread(new Runnable() {
050                    public void run() {
051                        try {
052                            if (!threadPool.awaitTermination(shutdownDelay, TimeUnit.MILLISECONDS)) {
053                                threadPool.shutdownNow();
054                            }
055                        } catch (InterruptedException e) {
056                            // Do nothing
057                        }
058                    }
059                }).start();
060            }
061        }
062    
063        public int capacity() {
064            BlockingQueue queue = threadPool.getQueue();
065            return queue.remainingCapacity() + queue.size();
066        }
067    
068        public int size() {
069            BlockingQueue queue = threadPool.getQueue();
070            return queue.size();
071        }
072    
073    }