一旦http调用花费的时间超过了Spring集成dsl所需的时间，如何发送错误消息？

Question

Here I've three subflows and out of which one is HTTP outbound call. I want that HTTP call should try to get response till a mentioned time. If times out then the main flow should break and it should show a Error message in Json format as output.

Below is the code -

 @Bean
  public IntegrationFlow flow() {
    return flow ->
        flow.handle(validatorService, "validateRequest")
            .split()
            .channel(c -> c.executor(Executors.newCachedThreadPool()))
            .scatterGather(
                scatterer ->
                    scatterer
                        .applySequence(true)
                        .recipientFlow(flow1())
                        .recipientFlow(
                            f ->
                                f.gateway(
                                    flow2(), gateway -> gateway.replyTimeout(3000L)))
                        .recipientFlow(flow3()),
                gatherer ->
                    gatherer
                        .releaseLockBeforeSend(true)
                        .releaseStrategy(group -> group.size() == 2))
            .aggregate(someMethod1())
            .to(someMethod2());
  }

Answer 1

See documentation for error handling in the messaging gateway: https://docs.spring.io/spring-integration/docs/current/reference/html/messaging-endpoints.html#gateway-no-response .

Consider to add an errorChannel() along side with that replyTimeout() on the gateway definition to build an error reply you'd like. However you also may consider to add something like a request timeout for the RestTemplate you use for that HTTP call to prevent the long wait for HTTP response.