springcloud(六)-Ribbon配置自定義算法

前言

不少場景下，可能根據須要自定義Ribbon的配置，例如修改Ribbon的負載均衡規則等。Spring Cloud Edgware容許使用java代碼或屬性自定義Ribbon 的配置，兩種方式等價。

Java代碼定義

咱們先說使用Java代碼寫配置類的方式定義負載均衡算法。

複製項目microservive-consumer-movie-ribbon，將ArtifactId修改成microservice-consumer-movie-ribbon-customizing。

1.建立Ribbon的配置類

@Configuration
public class RibbonConfiguration {
    @Bean
    public IRule ribbonRule() {
        // 負載均衡規則，改成隨機
        return new RandomRule();
    }
}

這裏要說一下，很關鍵。

這個類必定不要放到啓動類同目錄或同目錄的子目錄下，也就是@SpringBootApplication註解的子註解@ComponentScan所能掃描到的地方。不然該類中的配置信息將被全部的@RibbonClient共享。

固然了，你要是就想放到@ConponentScan能掃描的目錄下，你須要手動exclude掉，告訴springboot,不掃描它。

 

 

2.再建立一個空類，並在其上添加@Configuration註解和@RibbonClient註解。

@Configuration
@RibbonClient(name="microservice-provider-user",configuration=RibbonConfiguration.class)
public class TestConfiguration {

}

測試

啓動microservice-discovery-eureka.

啓動兩個或更多microservice-provider-user.

啓動microservice-consumer-movie-ribbon-customizing

屢次訪問http://localhost:8082/log-user-instance,看控制檯信息

2019-04-15 19:14:31.268  INFO 10592 --- [nio-8082-exec-9] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8081
2019-04-15 19:14:31.436  INFO 10592 --- [nio-8082-exec-1] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8084
2019-04-15 19:14:31.607  INFO 10592 --- [nio-8082-exec-3] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8081
2019-04-15 19:14:31.776  INFO 10592 --- [nio-8082-exec-4] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8084
2019-04-15 19:14:31.923  INFO 10592 --- [nio-8082-exec-7] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8084
2019-04-15 19:14:32.081  INFO 10592 --- [nio-8082-exec-9] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8081
2019-04-15 19:14:32.269  INFO 10592 --- [nio-8082-exec-1] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8081
2019-04-15 19:14:32.437  INFO 10592 --- [nio-8082-exec-3] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8081
2019-04-15 19:14:32.592  INFO 10592 --- [nio-8082-exec-4] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8081
2019-04-15 19:14:32.776  INFO 10592 --- [nio-8082-exec-7] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8084
2019-04-15 19:14:32.955  INFO 10592 --- [nio-8082-exec-9] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8084
2019-04-15 19:14:33.138  INFO 10592 --- [nio-8082-exec-1] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8084
2019-04-15 19:14:33.312  INFO 10592 --- [nio-8082-exec-3] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8084

沒毛病！

配置方式

咱們再說經過配置yml文件的方式。個人觀點是，能用配置的方式，儘可能不用Java代碼！

改個名字先：microservice-consumer-movie-ribbon-customizing-properties

和上面的方式比較：把上面那倆Java類刪咯。在application.yml文件中加上一段。

server:
  port: 8082
eureka:
  client:
    healthcheck:
      enabled: true
    serviceUrl:
      defaultZone: http://localhost:8083/eureka/
  instance:
    prefer-ip-address: true
spring:
  application:
    name: microservice-consumer-movie
# 表示對這個user的Ribbon Client的負載均衡設置爲隨機
# 若是去掉16行，下面固然往前移兩格，表示對全部的設置爲隨機
microservice-provider-user:
  ribbon:
    NFLoadBalancerRuleClassName: com.netflix.loadbalancer.RandomRule

你看，就三行，仍是配置方便，快捷。

測試

啓動microservice-discovery-eureka

啓動兩個或多個microservice-provider-user實例

啓動microservice-consumer-movie-ribbon-customizing-properties

屢次訪問http://localhost:8082/log-user-instance.看控制檯

2019-04-15 19:27:32.866  INFO 12792 --- [nio-8082-exec-7] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8081
2019-04-15 19:27:33.044  INFO 12792 --- [nio-8082-exec-8] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8084
2019-04-15 19:27:33.370  INFO 12792 --- [nio-8082-exec-1] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8084
2019-04-15 19:27:33.558  INFO 12792 --- [nio-8082-exec-3] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8084
2019-04-15 19:27:33.746  INFO 12792 --- [nio-8082-exec-5] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8081
2019-04-15 19:27:33.945  INFO 12792 --- [nio-8082-exec-7] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8084
2019-04-15 19:27:34.129  INFO 12792 --- [nio-8082-exec-8] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8081
2019-04-15 19:27:34.329  INFO 12792 --- [nio-8082-exec-1] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8084
2019-04-15 19:27:34.521  INFO 12792 --- [nio-8082-exec-3] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8081
2019-04-15 19:27:34.711  INFO 12792 --- [nio-8082-exec-5] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8081
2019-04-15 19:27:34.895  INFO 12792 --- [nio-8082-exec-7] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8084
2019-04-15 19:27:35.103  INFO 12792 --- [nio-8082-exec-8] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8084
2019-04-15 19:27:35.289  INFO 12792 --- [nio-8082-exec-1] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8081
2019-04-15 19:27:35.504  INFO 12792 --- [nio-8082-exec-3] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8084
2019-04-15 19:27:35.705  INFO 12792 --- [nio-8082-exec-5] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8084
2019-04-15 19:27:35.895  INFO 12792 --- [nio-8082-exec-7] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8084
2019-04-15 19:27:36.081  INFO 12792 --- [nio-8082-exec-8] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8084
2019-04-15 19:27:36.279  INFO 12792 --- [nio-8082-exec-1] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8084
2019-04-15 19:27:36.481  INFO 12792 --- [nio-8082-exec-3] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8081
2019-04-15 19:27:36.650  INFO 12792 --- [nio-8082-exec-5] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8081
2019-04-15 19:27:36.863  INFO 12792 --- [nio-8082-exec-7] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8084
2019-04-15 19:27:37.057  INFO 12792 --- [nio-8082-exec-8] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8081
2019-04-15 19:27:37.250  INFO 12792 --- [nio-8082-exec-1] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8084
2019-04-15 19:27:37.409  INFO 12792 --- [nio-8082-exec-3] c.i.cloud.controller.MovieController     : microservice-provider-user:192.168.1.33:8081

仍是沒毛病！

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代碼下載地址：https://gitee.com/fengyuduke/my_open_resources/blob/master/ribbon-customizing&properties.zip