RetryLoadBalancerInterceptor没有被调用

Question

我正在使用@FeignClient（以Ribbon为LB和Eureka为服务注册表为后盾）。 我想编写一个拦截器，该拦截器在发出负载平衡请求时会被调用。

我从Spring Cloud找到了RetryLoadBalancerInterceptor，但无法调用它。

我正在使用以下配置：

@Configuration
@AutoConfigureAfter({RibbonAutoConfiguration.class})
@AutoConfigureBefore({LoadBalancerAutoConfiguration.RetryInterceptorAutoConfiguration.class})
class InterceptorConfig {
    @Bean
    public RetryLoadBalancerInterceptor ribbonInterceptor(LoadBalancerClient loadBalancerClient, 
                                                          LoadBalancerRetryProperties properties,
                                                          LoadBalancerRequestFactory requestFactory,
                                                          LoadBalancedRetryFactory loadBalancedRetryFactory) {
        return new RibbonRetryInterceptor(loadBalancerClient, properties, requestFactory, loadBalancedRetryFactory);
    }
}

RibbonRetryInterceptor是我的实现，如下所示：

public class RibbonRetryInterceptor extends RetryLoadBalancerInterceptor {

    public RibbonRetryInterceptor(LoadBalancerClient loadBalancer, LoadBalancerRetryProperties lbProperties,
            LoadBalancerRequestFactory requestFactory, LoadBalancedRetryFactory lbRetryFactory) {
        super(loadBalancer, lbProperties, requestFactory, lbRetryFactory);
    }

    @Override
    public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution)
            throws IOException {
        System.out.println("Intercepting the request...");
        return super.intercept(request, body, execution);
    }
}

永远不会调用拦截方法。

我正在使用Spring Cloud BOM Greenwich.RELEASE，这是我的`pom.xml``

<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.acme</groupId>
    <artifactId>address.service.client</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>address.service.client</name>
    <url>http://www.acme.com</url>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.2.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>

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

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

        <!-- Required for health checks and info pages advertised by the service 
            and read by Eureka -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <!-- Required to enable hystrix / circuit breaking -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
        </dependency>

        <!-- For use of Feign client for HTTP / REST requests. -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

        <!-- Required for Ribbon-Loadbalanced REST Templates to do retries. -->
        <dependency>
            <groupId>org.springframework.retry</groupId>
            <artifactId>spring-retry</artifactId>
        </dependency>

        <!-- For custom Ribbon Client Implementation -->
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
        </dependency>

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

    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Greenwich.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>