Resilience4j重试-记录来自客户端的重试尝试？

Question

差不多吧。是否有一个属性，一些配置，一些设置，可以帮助做到这一点很容易请？不用添加太多锅炉代码。

@RestController
public class TestController {

    private final WebClient webClient;

    public TestController(WebClient.Builder webClientBuilder) {
        this.webClient = webClientBuilder.baseUrl("http://localhost:8443/serviceBgreeting").build();
    }

    @GetMapping("/greeting")
    public Mono<String> greeting() {
        System.out.println("Greeting method is invoked ");
        return someRestCall();
    }

    @Retry(name = "greetingRetry")
    public Mono<String> someRestCall() {
        return this.webClient.get().retrieve().bodyToMono(String.class);
    }

}

谢谢。

Answer 1

幸运的是（或者不幸的是）有一个未记录的特性：）

您可以添加RegistryEventConsumer Bean，以便将事件使用者添加到任何重试实例中。

    @Bean
    public RegistryEventConsumer<Retry> myRetryRegistryEventConsumer() {

        return new RegistryEventConsumer<Retry>() {
            @Override
            public void onEntryAddedEvent(EntryAddedEvent<Retry> entryAddedEvent) {
                entryAddedEvent.getAddedEntry().getEventPublisher()
                   .onEvent(event -> LOG.info(event.toString()));
            }

            @Override
            public void onEntryRemovedEvent(EntryRemovedEvent<Retry> entryRemoveEvent) {

            }

            @Override
            public void onEntryReplacedEvent(EntryReplacedEvent<Retry> entryReplacedEvent) {

            }
        };
    }

日志条目如下所示：

2020-10-26T13:00:19.807034700+01:00[Europe/Berlin]: Retry 'backendA', waiting PT0.1S until attempt '1'. Last attempt failed with exception 'org.springframework.web.client.HttpServerErrorException: 500 This is a remote exception'.

2020-10-26T13:00:19.912028800+01:00[Europe/Berlin]: Retry 'backendA', waiting PT0.1S until attempt '2'. Last attempt failed with exception 'org.springframework.web.client.HttpServerErrorException: 500 This is a remote exception'.

2020-10-26T13:00:20.023250+01:00[Europe/Berlin]: Retry 'backendA' recorded a failed retry attempt. Number of retry attempts: '3'. Giving up. Last exception was: 'org.springframework.web.client.HttpServerErrorException: 500 This is a remote exception'.