package com.j2eefast.common.core.thread;

import java.util.concurrent.CancellationException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


/**
 * 线程类
 * @author zhouzhou
 * @date 2017-03-12 16:36
 */
public class Threads {
	
	private static final Logger 					LOG 					= LoggerFactory.getLogger(Threads.class);
	
	/**
     * sleep等待,单位为毫秒
     */
    public static void sleep(long milliseconds){
        try{
            Thread.sleep(milliseconds);
        }
        catch (InterruptedException e){
            return;
        }
    }

    /**
     * 停止线程池
     * 先使用shutdown, 停止接收新任务并尝试完成所有已存在任务.
     * 如果超时, 则调用shutdownNow, 取消在workQueue中Pending的任务,并中断所有阻塞函数.
     * 如果仍人超時，則強制退出.
     * 另对在shutdown时线程本身被调用中断做了处理.
     */
    public static void shutdownAndAwaitTermination(ExecutorService pool){
    	
        if (pool != null && !pool.isShutdown()){
            pool.shutdown();
            try{
                if (!pool.awaitTermination(120, TimeUnit.SECONDS)){
                    pool.shutdownNow();
                    if (!pool.awaitTermination(120, TimeUnit.SECONDS)){
                    	LOG.info("Pool did not terminate");
                    }
                }
            }
            catch (InterruptedException ie){
                pool.shutdownNow();
                Thread.currentThread().interrupt();
            }
        }
    }

    /**
     * 打印线程异常信息
     */
    public static void printException(Runnable r, Throwable t){
    	
        if (t == null && r instanceof Future<?>){
            try{
                Future<?> future = (Future<?>) r;
                if (future.isDone()){
                    future.get();
                }
            }
            catch (CancellationException ce){
                t = ce;
            }
            catch (ExecutionException ee){
                t = ee.getCause();
            }
            catch (InterruptedException ie){
                Thread.currentThread().interrupt();
            }
        }
        if (t != null){
        	LOG.error(t.getMessage(), t);
        }
    }
}
