JAVA多线程后台异步，和同步并发

学习地址：

https://blog.csdn.net/qq_25806863/article/details/71126867

1. 同步并发获取结果：

    // 开通3个同步线程 空闲下进行
    ExecutorService executorService = Executors.newFixedThreadPool(3);
    List<Callable<Object>> searchTasks = new ArrayList<Callable<Object>>(); 
    // 根据查询shop 线程
     Callable<Object> shopCall =  new ShopCall();
    searchTasks.add(shopCall);
    searchTasks.add(shopCall);
    searchTasks.add(shopCall);
    //invokeAll 第一个参数是任务列表；第二个参数是过期时间；第三个是过期时间单位  
		try {
			logger.debug(">>> Starting runing thread");
			List<Future<Object>> futures = executorService.invokeAll(searchTasks,20, TimeUnit.SECONDS);

			jsonObject.put("shop", futures.get(0).get());

			
			executorService.shutdown();
			
		} catch (Exception e) {
			logger.error("Thread Error:{}",e);
			throw new RuntimeException("异步获取数据失败: "+e.getMessage());
		}

    /**
	 *  获取用户信息
	 * 
	 *
	 * 
	 */
	private class ShopCall implements Callable<Object>{

		public ShopCall() {

		}
		@Override
		public Object call() throws Exception {
			logger.debug(">>> Geting shop information:{}",slug);
			return null ;
		}
	}

异步后台线程：不关心结果

// 后台异步执行 execute
public static void main(String[] args) {
		ExecutorService executorService = Executors.newFixedThreadPool(3);
		Runnable myRunnable = new Runnable() {
    	    @Override
    	    public void run() {
    	        try {
    	            Thread.sleep(2000);
    	            System.out.println(Thread.currentThread().getName() + " run");
    	        } catch (InterruptedException e) {
    	            e.printStackTrace();
    	        }

    	    }
    	};
	     executorService.execute(myRunnable);
	     executorService.execute(myRunnable);
	     executorService.execute(myRunnable);
	     executorService.shutdown();
	    System.out.println("返回数据");
	}