spring cloud服务发现注解之@EnableDiscoveryClient与@EnableEurekaClient

时间:2021-01-13 08:20:07

使用服务发现的时候提到了两种注解,一种为@EnableDiscoveryClient,一种为@EnableEurekaClient,用法上基本一致,今天就来讲下两者,下文是从*上面找到的对这两者的解释:

There are multiple implementations of "Discovery Service" (eureka, consul, zookeeper). 
@EnableDiscoveryClient lives in spring-cloud-commons and picks the implementation on the classpath.
@EnableEurekaClient lives in spring-cloud-netflix and only works for eureka. If eureka is on your classpath, they are effectively the same.

原文地址为:What’s the difference between EnableEurekaClient and EnableDiscoveryClient?

意思也就是spring cloud中discovery service有许多种实现(eureka、consul、zookeeper等等),@EnableDiscoveryClient基于spring-cloud-commons, @EnableEurekaClient基于spring-cloud-netflix。

其实用更简单的话来说,就是如果选用的注册中心是eureka,那么就推荐@EnableEurekaClient,如果是其他的注册中心,那么推荐使用@EnableDiscoveryClient。

注解@EnableEurekaClient上有@EnableDiscoveryClient注解,可以说基本就是EnableEurekaClient有@EnableDiscoveryClient的功能,

另外上面的注释中提到,其实**@EnableEurekaClient**z注解就是一种方便使用eureka的注解而已,可以说使用其他的注册中心后,

都可以使用@EnableDiscoveryClient注解,但是使用@EnableEurekaClient的情景,就是在服务采用eureka作为注册中心的时候,使用场景较为单一。

@EnableEurekaClient


我们具体的对@EnableEurekaClient的源码看一下,如下:

/**
* Convenience annotation for clients to enable Eureka discovery configuration
* (specifically). Use this (optionally) in case you want discovery and know for sure that
* it is Eureka you want. All it does is turn on discovery and let the autoconfiguration
* find the eureka classes if they are available (i.e. you need Eureka on the classpath as
* well).
*
* @author Dave Syer
* @author Spencer Gibb
*/
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
@EnableDiscoveryClient
public @interface EnableEurekaClient { }