Springboot中Async异步的使用

为了降低用户得到反馈的时间，有些时候我们采用异步处理去获得消息，比较常见的是MQ，今天记录的是Springboot自带的@Async注解

// 开启异步
@Configuration
@EnableAsync
public class AsyncConfig implements AsyncConfigurer {

    @Override
    public Executor getAsyncExecutor() {
        ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
        //核心线程数
        taskExecutor.setCorePoolSize(8);
        //最大线程数
        taskExecutor.setMaxPoolSize(16);
        //队列大小
        taskExecutor.setQueueCapacity(100);
        taskExecutor.initialize();
        return taskExecutor;
    }
}

// 使用方法
@Async
public Future<TPromotionSeckill> update() throws InterruptedException {
    Thread.sleep(5000);
    System.out.println("开始异步执行任务");
    TPromotionSeckill promotionSeckill = service.updateByPrimaryKeySelective();
    System.out.println("结束异步执行任务");
    return new AsyncResult<>(promotionSeckill);
}

@Test
public void update() throws InterruptedException, ExecutionException, IOException {
	// 异步操作，无需等待结果，先执行接下去的
     Future<TPromotionSeckill> update = asy.update(); 
     System.out.println("先进行这一步");
    // 循环等待直到先前异步的操作有结果后，获得结果后，程序才继续进行下去
     TPromotionSeckill seckill = update.get();
     System.out.println("最后进行这一步");
}

Result
-----------------------------------------------------------------------
先进行这一步
开始异步执行任务
结束异步执行任务
最后进行这一步