package com.jcdm.common.utils;
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import java.util.concurrent.CancellationException;
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import java.util.concurrent.ExecutionException;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.Future;
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import java.util.concurrent.TimeUnit;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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/**
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* 线程相关工具类.
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*
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* @author jc
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*/
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public class Threads
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{
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private static final Logger logger = LoggerFactory.getLogger(Threads.class);
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/**
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* sleep等待,单位为毫秒
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*/
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public static void sleep(long milliseconds)
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{
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try
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{
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Thread.sleep(milliseconds);
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}
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catch (InterruptedException e)
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{
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return;
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}
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}
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/**
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* 停止线程池
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* 先使用shutdown, 停止接收新任务并尝试完成所有已存在任务.
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* 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.
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* 如果仍然超時，則強制退出.
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* 另对在shutdown时线程本身被调用中断做了处理.
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*/
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public static void shutdownAndAwaitTermination(ExecutorService pool)
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{
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if (pool != null && !pool.isShutdown())
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{
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pool.shutdown();
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try
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{
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if (!pool.awaitTermination(120, TimeUnit.SECONDS))
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{
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pool.shutdownNow();
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if (!pool.awaitTermination(120, TimeUnit.SECONDS))
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{
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logger.info("Pool did not terminate");
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}
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}
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}
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catch (InterruptedException ie)
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{
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pool.shutdownNow();
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Thread.currentThread().interrupt();
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}
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}
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}
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/**
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* 打印线程异常信息
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*/
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public static void printException(Runnable r, Throwable t)
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{
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if (t == null && r instanceof Future<?>)
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{
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try
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{
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Future<?> future = (Future<?>) r;
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if (future.isDone())
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{
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future.get();
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}
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}
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catch (CancellationException ce)
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{
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t = ce;
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}
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catch (ExecutionException ee)
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{
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t = ee.getCause();
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}
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catch (InterruptedException ie)
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{
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Thread.currentThread().interrupt();
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}
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}
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if (t != null)
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{
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logger.error(t.getMessage(), t);
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}
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}
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}
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