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package com.xiaoleilu.hutool.thread;

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

import com.xiaoleilu.hutool.exceptions.UtilException;

/**
 * 全局公共线程池
 * @author Looly
 *
 */
public class GlobalThreadPool {
	private static ExecutorService executor;
	
	private GlobalThreadPool() {}
	
	static{
		init();
	}
	
	/**
	 * 初始化全局线程池
	 */
	synchronized public static void init(){
		if(null != executor){
			executor.shutdownNow();
		}
		executor = Executors.newCachedThreadPool();
	}
	
	/**
	 * 关闭公共线程池
	 * @param isNow 是否立即关闭而不等待正在执行的线程
	 */
	synchronized public static void shutdown(boolean isNow){
		if(null != executor){
			if(isNow){
				executor.shutdownNow();
			}else{
				executor.shutdown();
			}
		}
	}
	
	/**
	 * 获得 {@link ExecutorService}
	 * @return {@link ExecutorService}
	 */
	public static ExecutorService getExecutor(){
		return executor;
	}
	
	/**
	 * 直接在公共线程池中执行线程
	 * 
	 * @param runnable 可运行对象
	 */
	public static void execute(Runnable runnable) {
		try {
			executor.execute(runnable);
		} catch (Exception e) {
			throw new UtilException("Exception when running task!", e);
		}
	}
	
	/**
	 * 执行有返回值的异步方法
* Future代表一个异步执行的操作,通过get()方法可以获得操作的结果,如果异步操作还没有完成,则,get()会使当前线程阻塞 * * @param 执行的Task * @param task {@link Callable} * @return Future */ public static Future submit(Callable task) { return executor.submit(task); } /** * 执行有返回值的异步方法
* Future代表一个异步执行的操作,通过get()方法可以获得操作的结果,如果异步操作还没有完成,则,get()会使当前线程阻塞 * * @param runnable 可运行对象 * @return {@link Future} * @since 3.0.5 */ public static Future submit(Runnable runnable) { return executor.submit(runnable); } }




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