resilience4J + Spring 启动 2.x

Question

我在 reative API spring 引导应用程序中使用 resilience4j 进行容错。我可以看到所有事件都被视为成功，即使 Mono 是 returning 错误。

服务层

    @Override
    @CircuitBreaker(name = "member-service")
    public Mono<String> getMemberInfo(String memberId) {
        return wsClient.getMemberInfo(memberId); 
       // This call will return WSException whenever there is 4XX or 5XX error
    }

application.yml配置

resilience4j.circuitbreaker:
  backends:
    member-service:
      ringBufferSizeInClosedState: 1
      ringBufferSizeInHalfOpenState: 2
      waitInterval: 10000
      failureRateThreshold: 75
      registerHealthIndicator: true
      recordExceptions:
        - com.xx.WSException
      ignoreExceptions:
        - com.xxx.WSClientException

我故意更改了 URI 路径，使 WebClient 总是 return 404 错误，从而抛出 WSException。当我看到端点下方时，类型始终为 SUCCESS。我错过了什么吗？

http://localhost:8088/circuitbreaker-events/member-service

{
"circuitBreakerEvents": [
{
"circuitBreakerName": "member-service",
"type": "SUCCESS",
"creationTime": "2019-02-18T21:56:21.588+05:30[Asia/Calcutta]",
"durationInMs": 6
},
{
"circuitBreakerName": "member-service",
"type": "SUCCESS",
"creationTime": "2019-02-18T21:56:21.588+05:30[Asia/Calcutta]",
"durationInMs": 5
},
{
"circuitBreakerName": "member-service",
"type": "SUCCESS",
"creationTime": "2019-02-18T21:56:21.588+05:30[Asia/Calcutta]",
"durationInMs": 6
}
}

Answer 1

你的方法总是returns Mono。即使有错误。并且 @CircuitBreaker 注释对异常做出反应（不是错误 Mono）。

所以你应该将 CircuitBreakerOperator 应用到你的响应式代码中。

public class MemberService {
    private final WsClient wsClient;
    private final CircuitBreaker circuitBreaker;

    public MemberService(WsClient wsClient,
                         CircuitBreakerRegistry circuitBreakerRegistry,
                         CircuitBreakerProperties circuitBreakerProperties) {
        this.wsClient = wsClient;
        this.circuitBreaker = circuitBreakerRegistry.circuitBreaker(
                "member-service",
                () -> circuitBreakerProperties
                        .createCircuitBreakerConfig("member-service"));
    }

    public Mono<String> getMemberInfo(String memberId) {
        return wsClient.getMemberInfo(memberId)
                .transform(CircuitBreakerOperator.of(circuitBreaker));
    }
}

您需要 resilience4j-reactor 和 resilience4j-spring-boot2 依赖项。

Answer 2

即将发布的Resilience4j 0.14.0版本将在使用注解时支持Mono：@CircuitBreaker(name = "member-service", type = ApiType.WEBFLUX)。

resilience4J + Spring 启动 2.x

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