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package org.wowtools.common.utils;

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

/**
 * 异步任务执行工具类
 * 
 * @author liuyu
 * @date 2016年7月4日
 */
public class AsyncTaskUtil {
	private static final ExecutorService pool = Executors.newCachedThreadPool();
	
	/**
	 * 执行一个异步任务
	 * @param task
	 */
	public static void execute(Runnable task){
		pool.execute(task);
	}

	/**
	 * 批量执行任务，并收集任务返回的数据，待所有任务执行完后一并返回
	 * @param tasks
	 * @return
	 */
	public static  List executeAsynTasksAndReturn(List> tasks){
		ArrayList> fs = new ArrayList<>();
		for(Callable  task:tasks){
			Future f = pool.submit(task);
			fs.add(f);
		}
		ArrayList res = new ArrayList<>();
		try {
			for(Future f:fs){
				T r = f.get();
				res.add(r);
			}
		}catch (Exception e) {
			throw new RuntimeException(e);
		}
		return res;
	}
	
	/**
	 * 批量执行任务
	 * @param tasks
	 * @param wait 是否等待所有任务执行完毕
	 */
	public static void executeAsynTasks(List tasks,boolean wait){
		if(!wait){
			for(Runnable task:tasks){
				pool.execute(task);
			}
			return;
		}
		ArrayList> fs = new ArrayList<>();
		for(Runnable task:tasks){
			Future f = pool.submit(task);
			fs.add(f);
		}
		try {
			for(Future f:fs){
				f.get();
			}
		}catch (Exception e) {
			throw new RuntimeException(e);
		}
	}

	
	@Override
	protected void finalize() throws Throwable {
		while(true){
			try {
				pool.shutdown();
			} catch (Exception e) {
				Thread.sleep(1000);
			}
			break;
		}
		super.finalize();
	}
}