[英]Intercept incoming message of Spring Cloud Stream SubscribableChannel
由於方法postReceive
的org.springframework.messaging.support.ChannelInterceptor
不調用org.springframework.messaging.SubscribableChannel
。 有沒有辦法攔截方法注釋@StreamListener(Sink.INPUT)
所有傳入消息?
例如:
在進入handle
方法之前攔截消息
@StreamListener(Sink.INPUT)
public void handle(Foo foo) {
// ...
}
以下是我對Spring Cloud Stream的設置
public interface EventSink {
String INPUT1 = "input1";
String INPUT2 = "input2";
@Input(INPUT1)
SubscribableChannel input1();
@Input(INPUT2)
SubscribableChannel input2();
}
public interface EventSource {
String OUTPUT1 = "output1";
String OUTPUT2 = "output2";
@Output(OUTPUT1)
MessageChannel output1();
@Output(OUTPUT2)
MessageChannel output2()';
}
spring:
cloud:
stream:
bindings:
input1:
destination: input1
input2:
destination: input2
output1:
destination: output1
output2:
destination: output2
public class EventHandler {
@StreamListener(EventSink.INPUT1)
public void handle(Foo1 foo) {
// ...
}
@StreamListener(EventSink.INPUT2)
public void handle(Foo2 foo) {
// ...
}
}
@Service
public class Bar1Service {
@Autowired
private EventSource source;
public void bar1() {
source.output1().send(MessageBuilder.withPayload("bar1").build());
}
}
@Service
public class Bar2Service {
@Autowired
private EventSource source;
public void bar2() {
source.output2().send(MessageBuilder.withPayload("bar2").build());
}
}
使用DirectChannel
,binder會在同一個線程上調用您的偵聽器,因此preSend
在此處是合適的。
但是,您不必使用ThreadLocal
,您可以使用方法簽名訪問標頭...
@StreamListener(Processor.INPUT)
public void handle(Foo foo, @Header("bar") String bar) {
...
}
編輯
@EnableBinding(Processor.class)
public class So41459187Application {
public static void main(String[] args) {
SpringApplication.run(So41459187Application.class, args);
}
@StreamListener(Processor.INPUT)
@SendTo(Processor.OUTPUT)
public String handle(String in) {
return in.toUpperCase();
}
@Configuration
public static class Config {
@Bean
public BeanPostProcessor channelConfigurer() {
return new BeanPostProcessor() {
@Override
public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
return bean;
}
@Override
public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
if ("input".equals(beanName)) {
((AbstractMessageChannel) bean).addInterceptor(new ChannelInterceptorAdapter() {
@Override
public Message<?> preSend(Message<?> message, MessageChannel channel) {
System.out.println("PreSend on INPUT: " + message);
return message;
}
});
}
else if ("output".equals(beanName)) {
((AbstractMessageChannel) bean).addInterceptor(new ChannelInterceptorAdapter() {
@Override
public Message<?> preSend(Message<?> message, MessageChannel channel) {
System.out.println("PreSend on OUTPUT: " + message);
return message;
}
});
}
return bean;
}
};
}
}
}
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