Spring cloud stream kafka pause/resume binders

Question

We are using spring cloude stream 2.0 & Kafka as a message broker.
We\'ve implemented a circuit breaker which stops the Application context, for cases w

Answer 1

Sorry, I misread your question.

You can auto wire the BindingsEndpoint but, unfortunately, its State enum is private so you can't call changeState() programmatically.

I have opened an issue for this.

EDIT

You can do it with reflection, but it's a bit ugly...

@SpringBootApplication
@EnableBinding(Sink.class)
public class So53476384Application {

    public static void main(String[] args) {
        SpringApplication.run(So53476384Application.class, args);
    }

    @Autowired
    BindingsEndpoint binding;

    @Bean
    public ApplicationRunner runner() {
        return args -> {
            Class clazz = ClassUtils.forName("org.springframework.cloud.stream.endpoint.BindingsEndpoint$State",
                    So53476384Application.class.getClassLoader());
            ReflectionUtils.doWithMethods(BindingsEndpoint.class, method -> {
                try {
                    method.invoke(this.binding, "input", clazz.getEnumConstants()[2]); // PAUSE
                }
                catch (InvocationTargetException e) {
                    e.printStackTrace();
                }
            }, method -> method.getName().equals("changeState"));
        };
    }

    @StreamListener(Sink.INPUT)
    public void listen(String in) {

    }

}