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package com.xiaoleilu.hutool.thread;

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

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 = new ThreadPoolExecutor(0, Integer.MAX_VALUE, 60L, TimeUnit.SECONDS,
				new SynchronousQueue());
	}

	/**
	 * 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);
	}
}