调用不会调用 Resilience4 断路器的后备方法

Question

我正在使用 Resilience4j 断路器版本：'1.4.0 和 Spring boot 版本 2.0.6，我的问题是 - 回退方法不起作用。该调用不会转到后备方法。下面是我的代码：

@Override
@CircuitBreaker(name="mainService",fallbackMethod = "callFallback")
public JSONObject callService(JSONObject rawRequest) throws TimeoutException {
      ...
       throw new TimeoutException("Time occured while calling 
       service");
      ...
}

-- 和后备方法：

private JSONObject callFallback(JSONObject rawRequest,Throwable t){

    System.out.println("Inside fallback method callNsFallback, 
        cause"+t.toString());

        logger.info("Inside fallback method callFallback, 
        cause - {}",t.toString());

    return rawRequest;
}

--application.yml中的配置

resilience4j:
circuitbreaker:
    configs:
    default:
        registerHealthIndicator: true
        ringBufferSizeInClosedState: 5
        ringBufferSizeInHalfOpenState: 3
        slidingWindowSize: 10
        minimumNumberOfCalls: 5
        permittedNumberOfCallsInHalfOpenState: 3
        automaticTransitionFromOpenToHalfOpenEnabled: true
        waitDurationInOpenState: 1s
        failureRateThreshold: 50
        eventConsumerBufferSize: 10
        recordExceptions:
        - java.util.concurrent.TimeoutException
    instances:
    mainService:
        baseConfig: default

Answer 1

可能的原因可能是您缺少一些必需的依赖项。在这里，我分享对我有用的依赖项和 yaml 配置。

pom.xml

<dependencies>  
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <dependency>
            <groupId>io.github.resilience4j</groupId>
            <artifactId>resilience4j-spring-boot2</artifactId>
            <version>1.7.1</version>
        </dependency>
    </dependencies>

应用程序.yml

resilience4j:
  circuitbreaker:
    instances:
      menu-service:
        registerHealthIndicator: true
        eventConsumerBufferSize: 10
        automaticTransitionFromOpenToHalfOpenEnabled: true
        failureRateThreshold: 50
        minimumNumberOfCalls: 5
        permittedNumberOfCallsInHalfOpenState: 1
        slidingWindowSize: 10
        waitDurationInOpenState: 2s
        slidingWindowType: COUNT_BASED
        
        
management:
  health:
    circuitbreakers:
      enabled: true
  endpoints:
    web:
      exposure:
        include: health
  endpoint:
    health:
      show-details: always