为什么我的断路器总是在默认情况下是打开的，并且从属性上不能在minimumNumberOfCalls上工作

Question

我是新的实现断路器的功能，在春季启动。我在build.gradle文件中添加了所有所需的依赖项，并在异常情况下将断路器注释添加到回退方法中，因此我知道断路器依赖项正在工作。问题是，断路器总是打开的，不能根据application.yml文件中设置的断路器属性工作。我将解释我通过代码片段添加了什么。

我的build.gradle文件具有依赖关系：

```implementation('io.github.resilience4j:resilience4j-spring-boot2:1.6.1')```

**Controller:**

```javascript

@GET

 @Path("product/{id}")

   public Response getProduct(@PathParam("id") Integer id) {

        logger.info("demo-service called for productId {}", id);

        return Response.ok(userService.getProduct(id)).build();

 }

**Service:**

```javascript

@断路器(名称= "demoServiceCircuitBreaker"，fallbackMethod = "demoServiceFallbackMethod")

public ProductResponse getProduct(Integer id) {

    throw new IllegalStateException("Service is in error");

}

public ProductResponse demoServiceFallbackMethod(整数id，异常exc) {

        logger.error("Got an error, executing fallbackmethod and returning default from application");

        return defaultProduct();

 }

公众ProductResponse defaultProduct() {

    ProductResponse productResponse = new ProductResponse();

    productResponse.setId(999);

    productResponse.setName("Free coffee");

    productResponse.setPrice(0.0);

    return productResponse;

}

**application.yml**

```javascript

resilience4j：

circuitbreaker:

    configs:

      default:

        failureRateThreshold: 50                 #  Configures the failure rate threshold in percentage. When the failure rate is equal or greater than the threshold the CircuitBreaker transitions to open and starts short-circuiting calls. 

        slowCallRateThreshold: 50                # Configures a threshold in percentage. The CircuitBreaker considers a call as slow when the call duration is greater than slowCallDurationThreshold

        slowCallDurationThreshold: PT5S          # Configures the duration threshold above which calls are considered as slow and increase the rate of slow calls.

        permittedNumberOfCallsInHalfOpenState: 3 # Configures the number of permitted calls when the CircuitBreaker is half open.

        slidingWindowType: COUNT_BASED           # If the sliding window is COUNT_BASED, the last slidingWindowSize calls are recorded and aggregated.

        slidingWindowSize: 10                    # Configures the size of the sliding window which is used to record the outcome of calls when the CircuitBreaker is closed.

        minimumNumberOfCalls: 2                  # Configures the minimum number of calls which are required (per sliding window period) before the CircuitBreaker can calculate the error rate or slow call rate.

        waitDurationInOpenState: PT5S            # The time that the CircuitBreaker should wait before transitioning from open to half-open.

        #recordExceptions:

        #   - org.springframework.web.client.HttpServerErrorException

         #  - java.io.IOException

          # - java.util.concurrent.TimeoutException

           #- org.springframework.web.client.ResourceAccessException

instances:

     demoServiceCircuitBreaker:

        baseConfig: default

每当我到达端点时，它都会以json (从回退方法)返回ProductResponse。当需要启动监视或忽略故障阈值时，它看不到最小的调用数。我希望看到异常(服务出错)，首先在前2次调用中，最后在达到阈值之后，它应该返回json中的ProductResponse。

请帮我找出我错过了什么。试着从application.yml中删除一些秘密，但问题依然存在。

Answer 1

您的配置和属性是正确的。只有在记录了minimumNumberOfCalls后，断路器才会打开。

以上ProductResponse的原因是由于Resilience4J的回退机制。

如果配置了回退方法，则将每个异常转发给回退方法执行器。回退方法执行器正在寻找能够处理异常的最佳匹配回退方法。

从今以后，缩小从Exception到CallNotPermittedException的回退方法的论证范围。

public ProductResponse demoServiceFallbackMethod(Integer id, CallNotPermittedException exc) {
            logger.error("Got an error, executing fallbackmethod and returning default from application");
            return defaultProduct();
     }