Configure error handling and retry for Http.outboundGateway spring dsl

问题

I have a requirement where i need to make a rest call when it fails i have to retry 3 times and depending on the status code received i need perform different action, i couldn't find a proper spring integration dsl example. How to configure the error handler and retry

@Bean
public IntegrationFlow performCreate() {
    return IntegrationFlows.from("createFlow")
            .handle(Http.outboundGateway("http://localhost:8080/create")
                    .httpMethod(HttpMethod.GET)
                    .expectedResponseType(String.class)
                    .requestFactory(simpleClientHttpRequestFactory())
                    .errorHandler(??)
            )

            .log(LoggingHandler.Level.DEBUG, "response", m -> m.getPayload())
            .log(LoggingHandler.Level.DEBUG, "response", m -> m.getHeaders())
            .get();
}

private SimpleClientHttpRequestFactory simpleClientHttpRequestFactory() {
    SimpleClientHttpRequestFactory simpleClientHttpRequestFactory = new SimpleClientHttpRequestFactory();
    simpleClientHttpRequestFactory.setReadTimeout(5000);
    simpleClientHttpRequestFactory.setConnectTimeout(5000);
    return simpleClientHttpRequestFactory;
}

回答1:

The Java DSL .handle() has a second argument - Consumer<GenericEndpointSpec<?>> and that one can be configured with the:

/**
 * Configure a list of {@link Advice} objects to be applied, in nested order, to the
 * endpoint's handler. The advice objects are applied only to the handler.
 * @param advice the advice chain.
 * @return the endpoint spec.
 */
public S advice(Advice... advice) {

One of those advises is in the Spring Integration box - RequestHandlerRetryAdvice: https://docs.spring.io/spring-integration/docs/5.0.4.RELEASE/reference/html/messaging-endpoints-chapter.html#retry-advice

https://docs.spring.io/spring-integration/docs/5.0.4.RELEASE/reference/html/java-dsl.html#java-dsl-endpoints

.handle(Http.outboundGateway("http://localhost:8080/create")
                .httpMethod(HttpMethod.GET)
                .expectedResponseType(String.class)
                .requestFactory(simpleClientHttpRequestFactory()),
           e -> e.advice(retryAdvice())

...

@Bean
public RequestHandlerRetryAdvice retryAdvice() {
    RequestHandlerRetryAdvice requestHandlerRetryAdvice = new RequestHandlerRetryAdvice();
    requestHandlerRetryAdvice.setRecoveryCallback(errorMessageSendingRecoverer());
    return requestHandlerRetryAdvice;
}

@Bean
public ErrorMessageSendingRecoverer errorMessageSendingRecoverer() {
    return new ErrorMessageSendingRecoverer(recoveryChannel())
}

@Bean
public MessageChannel recoveryChannel() {
    return new DirectChannel();
}

@Bean
public IntegrationFlow handleRecovery() { 
     return IntegrationFlows.from("recoveryChannel")
                   .log(LoggingHandler.Level.ERROR, "error", 
                        m -> m.getPayload())
                   .get(); 
}

来源：https://stackoverflow.com/questions/49784360/configure-error-handling-and-retry-for-http-outboundgateway-spring-dsl

标签

spring-integration

spring-integration-dsl