com.avaje.ebeaninternal.server.lib.DaemonThreadFactory Maven / Gradle / Ivy

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/**
 * Copyright (C) 2009 Authors
 * 
 * This file is part of Ebean.
 * 
 * Ebean is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *  
 * Ebean is distributed in the hope that it will be useful, but 
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with Ebean; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA  
 */
package com.avaje.ebeaninternal.server.lib;


import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * ThreadFactory for Daemon threads.
 * 
 * Daemon threads do not stop a JVM stopping. If an application only has Daemon
 * threads left it will shutdown.
 * 
 * 
 * In using Daemon threads you need to either not care about being interrupted
 * on shutdown or register with the JVM shutdown hook to perform a nice shutdown
 * of the daemon threads etc.
 * 
 * 
 * @author rbygrave
 */
public class DaemonThreadFactory implements ThreadFactory {

    private static final AtomicInteger poolNumber = new AtomicInteger(1);
    
    private final ThreadGroup group;
    
    private final AtomicInteger threadNumber = new AtomicInteger(1);
    
    private final String namePrefix;

    public DaemonThreadFactory(String namePrefix) {
        SecurityManager s = System.getSecurityManager();
        this.group = (s != null) ? s.getThreadGroup() : Thread.currentThread().getThreadGroup();
        this.namePrefix = namePrefix != null ? namePrefix : "pool-" + poolNumber.getAndIncrement() + "-thread-";
    }

    public Thread newThread(Runnable r) {

        Thread t = new Thread(group, r, namePrefix + threadNumber.getAndIncrement(), 0);

        t.setDaemon(true);

        if (t.getPriority() != Thread.NORM_PRIORITY) {
            t.setPriority(Thread.NORM_PRIORITY);
        }

        return t;
    }
}