Logback: the reliable, generic, fast and flexible logging framework.
Copyright (C) 1999-2015, QOS.ch. All rights reserved.
This program and the accompanying materials are dual-licensed under
either the terms of the Eclipse Public License v1.0 as published by
the Eclipse Foundation
  or (per the licensee's choosing)
under the terms of the GNU Lesser General Public License version 2.1
as published by the Free Software Foundation.
/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.core.util;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

import ch.qos.logback.core.CoreConstants;

Static utility methods for manipulating an ExecutorService. 
Author:
Carl Harris, Mikhail Mazursky/**
 * Static utility methods for manipulating an {@link ExecutorService}.
 * 
 * @author Carl Harris
 * @author Mikhail Mazursky
 */
public class ExecutorServiceUtil {

    private static final ThreadFactory THREAD_FACTORY = new ThreadFactory() {

        private final ThreadFactory defaultFactory = Executors.defaultThreadFactory();
        private final AtomicInteger threadNumber = new AtomicInteger(1);

        public Thread newThread(Runnable r) {
            Thread thread = defaultFactory.newThread(r);
            if (!thread.isDaemon()) {
                thread.setDaemon(true);
            }
            thread.setName("logback-" + threadNumber.getAndIncrement());
            return thread;
        }
    };

    static public ScheduledExecutorService newScheduledExecutorService() {
        return new ScheduledThreadPoolExecutor(CoreConstants.SCHEDULED_EXECUTOR_POOL_SIZE, THREAD_FACTORY);
    }


    
Creates an executor service suitable for use by logback components.
Returns:
executor service/**
     * Creates an executor service suitable for use by logback components.
     * @return executor service
     */
    static public ExecutorService newExecutorService() {
        return new ThreadPoolExecutor(CoreConstants.CORE_POOL_SIZE, CoreConstants.MAX_POOL_SIZE, 0L, TimeUnit.MILLISECONDS, new SynchronousQueue<Runnable>(),
                        THREAD_FACTORY);
    }

    
Shuts down an executor service.

Params:
executorService – the executor service to shut down/**
     * Shuts down an executor service.
     * <p>
     * @param executorService the executor service to shut down
     */
    static public void shutdown(ExecutorService executorService) {
        executorService.shutdownNow();
    }

}