/*
 * (C) 2007-2012 Alibaba Group Holding Limited.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * Authors:
 *   wuhua <wq163@163.com> , boyan <killme2008@gmail.com>
 */
package com.taobao.metamorphosis.utils;

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


/**
 * �������̵߳�Factory�࣬�Ա��Զ����߳���
 * 
 * @author <a href="mailto:bixuan@taobao.com">bixuan</a>
 */
public class NamedThreadFactory implements ThreadFactory {
    static final AtomicInteger poolNumber = new AtomicInteger(1);
    final ThreadGroup group;
    final AtomicInteger threadNumber = new AtomicInteger(1);
    final String namePrefix;


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


    public NamedThreadFactory(final String name) {
        final SecurityManager s = System.getSecurityManager();
        this.group = s != null ? s.getThreadGroup() : Thread.currentThread().getThreadGroup();
        this.namePrefix = generateNamePrefix(name);
    }


    public static String generateNamePrefix(final String name) {
        return name + "-" + poolNumber.getAndIncrement() + "-thread-";
    }


    /*
     * (non-Javadoc)
     * 
     * @see java.util.concurrent.ThreadFactory#newThread(java.lang.Runnable)
     */
    @Override
    public Thread newThread(final Runnable r) {
        // ? DZ�ڵ���������󴴽�������̵߳ļ����᲻�ᳬ��integer�����ֵ
        final Thread t = new Thread(this.group, r, this.namePrefix + this.threadNumber.getAndIncrement(), 0);
        if (t.isDaemon()) {
            t.setDaemon(false);
        }
        if (t.getPriority() != Thread.NORM_PRIORITY) {
            t.setPriority(Thread.NORM_PRIORITY);
        }
        return t;
    }
}