在 Spring 生态中玩转 RocketMQ中Bus 消息的接收的发送是如何实现的？

"// BusAutoConfiguration @EventListener(classes = RemoteApplicationEvent.class) // 1 public void acceptLocal(RemoteApplicationEvent event) { if (this.serviceMatcher.isFromSelf(event) && !(event instanceof AckRemoteApplicationEvent)) { // 2

this.cloudBusOutboundChannel.send(MessageBuilder.withPayload(event).build()); // 3 } } @StreamListener(SpringCloudBusClient.INPUT) // 4 public void acceptRemote(RemoteApplicationEvent event) { if (event instanceof AckRemoteApplicationEvent) { if (this.bus.getTrace().isEnabled()&& !this.serviceMatcher.isFromSelf(event) && this.applicationEventPublisher != null) { // 5 this.applicationEventPublisher.publishEvent(event); } // If it's an ACK we are finished processing at this point return; } if (this.serviceMatcher.isForSelf(event) && this.applicationEventPublisher != null) { // 6 if (!this.serviceMatcher.isFromSelf(event)) { // 7 this.applicationEventPublisher.publishEvent(event); } if (this.bus.getAck().isEnabled()) { // 8 AckRemoteApplicationEvent ack = new AckRemoteApplicationEvent(this, this.serviceMatcher.getServiceId(), this.bus.getAck().getDestinationService(), event.getDestinationService(), event.getId(), event.getClass()); this.cloudBusOutboundChannel .send(MessageBuilder.withPayload(ack).build()); this.applicationEventPublisher.publishEvent(ack); } } if (this.bus.getTrace().isEnabled() && this.applicationEventPublisher != null) { // 9 // We are set to register sent events so publish it for local consumption, // irrespective of the origin this.applicationEventPublisher.publishEvent(new SentApplicationEvent(this, event.getOriginService(), event.getDestinationService(), event.getId(), event.getClass())); } } 这本电子书收录开发者藏经阁，下载连接：https://developer.aliyun.com/topic/download?id=1216"