SpringBoot：Event实现发布/订阅模式

@Service
public class OrderService {
   public void orderSuccess(){

       // 订单完成异步任务开启 可以再统一封装
       Order order = new Order();
       order.setOrderNo(String.valueOf(System.currentTimeMillis()));
       Map<String, OrderSuccessService> orderSuccessServiceMap = SpringContextUtil.getBeansOfType(OrderSuccessService.class);
       orderSuccessServiceMap.values().forEach(service -> {
           service.orderSuccess(order);
      });
  }
}
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public interface OrderSuccessService {
   /**
    * 订单支付成功
    * @param order
    */
   public CompletableFuture<Boolean> orderSuccess(Order order);
}
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@Slf4j
@Service
public class MerchantNoticeServiceImpl implements OrderSuccessService {
   @Override
   @Async("taskExecutor")
   public CompletableFuture<Boolean> orderSuccess(Order order) {
       log.info("{}商户通知:{}",Thread.currentThread(),order);
       // 返回异步调用的结果
       return CompletableFuture.completedFuture(true);
  }
}
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@Slf4j
@Service
public class MerchantNoticeServiceImpl implements OrderSuccessService {
   @Override
   @Async("taskExecutor")
   public CompletableFuture<Boolean> orderSuccess(Order order) {
       log.info("{}商户通知:{}",Thread.currentThread(),order);
       // 返回异步调用的结果
       return CompletableFuture.completedFuture(true);
  }
}
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@Slf4j
@Service
public class MerchantNoticeServiceImpl implements OrderSuccessService {
   @Override
   @Async("taskExecutor")
   public CompletableFuture<Boolean> orderSuccess(Order order) {
       log.info("{}商户通知:{}",Thread.currentThread(),order);
       // 返回异步调用的结果
       return CompletableFuture.completedFuture(true);
  }
}
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@Configuration // 配置类
@EnableAsync // @Async注解能够生效
public class TaskConfiguration {
   @Bean("taskExecutor")
   public Executor taskExecutor(){
       ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
       // 线程池创建时候初始化的线程数
       executor.setCorePoolSize(5);
       // 线程池最大的线程数，只有在缓冲队列满了之后，才会申请超过核心线程数的线程
       executor.setMaxPoolSize(10);
       // 用来缓冲执行任务的队列
       executor.setQueueCapacity(200);
       // 当超过了核心线程之外的线程，在空闲时间到达之后会被销毁
       executor.setKeepAliveSeconds(60);
       // 可以用于定位处理任务所在的线程池
       executor.setThreadNamePrefix("taskExecutor-orderSuccess-");
       // 这里采用CallerRunsPolicy策略，当线程池没有处理能力的时候，该策略会直接在execute方法的调用线程中运行被拒绝的任务；
       // 如果执行程序已关闭，则会丢弃该任务
       executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
       // 设置 线程池关闭 的时候 等待 所有任务都完成后，再继续 销毁 其他的 Bean，
       // 这样这些 异步任务 的 销毁 就会先于 数据库连接池对象 的销毁。
       executor.setWaitForTasksToCompleteOnShutdown(true);
       // 该方法用来设置线程池中 任务的等待时间，如果超过这个时间还没有销毁就 强制销毁，以确保应用最后能够被关闭，而不是阻塞住。
       executor.setAwaitTerminationSeconds(60);
       return executor;
  }
}
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public class OrderApplicationEvent extends ApplicationEvent {
   public OrderApplicationEvent(OrderData orderData){
       super(orderData);
  }
}
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@Data
public class OrderData {
   /**
    * 订单号
    */
   private String orderNo;
}
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@Slf4j
@Service
public class MerchantNoticeListener {
   @Async("asyncEventTaskExecutor")
   @EventListener
   public CompletableFuture<Boolean> orderSuccess(OrderApplicationEvent event) {
       log.info("{}商户通知:{}",Thread.currentThread(),event);
       // 返回异步调用的结果
       return CompletableFuture.completedFuture(true);
  }
}
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@Slf4j
@Service
public class UserNoticeListener implements ApplicationListener<OrderApplicationEvent> {
   @Override
   @Async("asyncEventTaskExecutor")
   public void onApplicationEvent(OrderApplicationEvent event) {
       log.info("{}用户通知:{}",Thread.currentThread(),event);
  }
}
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@Slf4j
@Service
public class UserNoticeListener implements ApplicationListener<OrderApplicationEvent> {
   @Override
   @Async("asyncEventTaskExecutor")
   public void onApplicationEvent(OrderApplicationEvent event) {
       log.info("{}用户通知:{}",Thread.currentThread(),event);
  }
}
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@Slf4j
@Service
public class UserNoticeListener implements ApplicationListener<OrderApplicationEvent> {
   @Override
   @Async("asyncEventTaskExecutor")
   public void onApplicationEvent(OrderApplicationEvent event) {
       log.info("{}用户通知:{}",Thread.currentThread(),event);
  }
}
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@Configuration
@Slf4j
@EnableAsync // @Async注解能够生效
public class AsyncConfiguration implements AsyncConfigurer {
   @Bean("asyncEventTaskExecutor")
   public ThreadPoolTaskExecutor executor(){
       //Spring封装的一个线程池
       ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
       executor.setCorePoolSize(5);
       executor.setMaxPoolSize(50);
       executor.setQueueCapacity(30);
       executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
       executor.setThreadNamePrefix("asyncEventTaskExecutor--orderSuccess-");
       executor.initialize();
       return executor;
  }

   @Override
   public Executor getAsyncExecutor(){
       return executor();
  }

   /**
    * 异常处理
    * @return
   @Override
   public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler(){
       return (ex, method, params) -> log.error(String.format("[async] task{} error:", method), ex);
  }
}
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