/*
 * Copyright 1999-2012 Alibaba Group.
 *  
 * 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.
 */
package com.alibaba.cobar.util;

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

/**
 * @author xianmao.hexm
 */
public class ExecutorUtil {

    public static final NameableExecutor create(String name, int size) {
        return create(name, size, true);
    }

    public static final NameableExecutor create(String name, int size, boolean isDaemon) {
        NameableThreadFactory factory = new NameableThreadFactory(name, isDaemon);
        return new NameableExecutor(name, size, new LinkedBlockingQueue<Runnable>(), factory);
    }

    private static class NameableThreadFactory implements ThreadFactory {
        private final ThreadGroup group;
        private final String namePrefix;
        private final AtomicInteger threadId;
        private final boolean isDaemon;

        public NameableThreadFactory(String name, boolean isDaemon) {
            SecurityManager s = System.getSecurityManager();
            this.group = (s != null) ? s.getThreadGroup() : Thread.currentThread().getThreadGroup();
            this.namePrefix = name;
            this.threadId = new AtomicInteger(0);
            this.isDaemon = isDaemon;
        }

        public Thread newThread(Runnable r) {
            Thread t = new Thread(group, r, namePrefix + threadId.getAndIncrement());
            t.setDaemon(isDaemon);
            if (t.getPriority() != Thread.NORM_PRIORITY) {
                t.setPriority(Thread.NORM_PRIORITY);
            }
            return t;
        }
    }

}