1 /**
2  * Logback: the reliable, generic, fast and flexible logging framework.
3  * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
4  *
5  * This program and the accompanying materials are dual-licensed under
6  * either the terms of the Eclipse Public License v1.0 as published by
7  * the Eclipse Foundation
8  *
9  *   or (per the licensee's choosing)
10  *
11  * under the terms of the GNU Lesser General Public License version 2.1
12  * as published by the Free Software Foundation.
13  */
14 package ch.qos.logback.core.util;
15
16 import java.util.concurrent.ExecutorService;
17 import java.util.concurrent.Executors;
18 import java.util.concurrent.ScheduledExecutorService;
19 import java.util.concurrent.ScheduledThreadPoolExecutor;
20 import java.util.concurrent.SynchronousQueue;
21 import java.util.concurrent.ThreadFactory;
22 import java.util.concurrent.ThreadPoolExecutor;
23 import java.util.concurrent.TimeUnit;
24 import java.util.concurrent.atomic.AtomicInteger;
25
26 import ch.qos.logback.core.CoreConstants;
27
28 /**
29  * Static utility methods for manipulating an {@link ExecutorService}.
30  * 
31  * @author Carl Harris
32  * @author Mikhail Mazursky
33  */
34 public class ExecutorServiceUtil {
35
36     private static final ThreadFactory THREAD_FACTORY = new ThreadFactory() {
37
38         private final ThreadFactory defaultFactory = Executors.defaultThreadFactory();
39         private final AtomicInteger threadNumber = new AtomicInteger(1);
40
41         public Thread newThread(Runnable r) {
42             Thread thread = defaultFactory.newThread(r);
43             if (!thread.isDaemon()) {
44                 thread.setDaemon(true);
45             }
46             thread.setName("logback-" + threadNumber.getAndIncrement());
47             return thread;
48         }
49     };
50
51     static public ScheduledExecutorService newScheduledExecutorService() {
52         return new ScheduledThreadPoolExecutor(CoreConstants.SCHEDULED_EXECUTOR_POOL_SIZE, THREAD_FACTORY);
53     }
54
55
56     /**
57      * Creates an executor service suitable for use by logback components.
58      * @return executor service
59      */
60     static public ExecutorService newExecutorService() {
61         return new ThreadPoolExecutor(CoreConstants.CORE_POOL_SIZE, CoreConstants.MAX_POOL_SIZE, 0L, TimeUnit.MILLISECONDS, new SynchronousQueue<Runnable>(),
62                         THREAD_FACTORY);
63     }
64
65     /**
66      * Shuts down an executor service.
67      * <p>
68      * @param executorService the executor service to shut down
69      */
70     static public void shutdown(ExecutorService executorService) {
71         executorService.shutdownNow();
72     }
73
74 }
75