1.client端

EurekaClient提供三个功能:

EurekaClient API contracts are:
* - provide the ability to get InstanceInfo(s) (in various different ways)
* - provide the ability to get data about the local Client (known regions, own AZ etc)
* - provide the ability to register and access the healthcheck handler for the client

使用@EnableEurekaClient起效,其定义如下:

/**
* 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 { }

注册

/**
* Annotation to enable a DiscoveryClient implementation.
* @author Spencer Gibb
*/
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
@Import(EnableDiscoveryClientImportSelector.class)
public @interface EnableDiscoveryClient { /**
* If true, the ServiceRegistry will automatically register the local server.
*/
boolean autoRegister() default true;
}
EnableDiscoveryClientImportSelector继承自SpringFactoryImportSelector,在容器启动时触发,前文已经有介绍执行路径:

在其父类org.springframework.cloud.commons.util.SpringFactoryImportSelector
的String[] selectImports(AnnotationMetadata metadata)方法中正是根据这个标记类判定是否加载如下定义的类。

@Override
public String[] selectImports(AnnotationMetadata metadata) {
if (!isEnabled()) {
return new String[0];
}
AnnotationAttributes attributes = AnnotationAttributes.fromMap(
metadata.getAnnotationAttributes(this.annotationClass.getName(), true)); Assert.notNull(attributes, "No " + getSimpleName() + " attributes found. Is "
+ metadata.getClassName() + " annotated with @" + getSimpleName() + "?"); // Find all possible auto configuration classes, filtering duplicates
List<String> factories = new ArrayList<>(new LinkedHashSet<>(SpringFactoriesLoader
.loadFactoryNames(this.annotationClass, this.beanClassLoader))); if (factories.isEmpty() && !hasDefaultFactory()) {
throw new IllegalStateException("Annotation @" + getSimpleName()
+ " found, but there are no implementations. Did you forget to include a starter?");
} if (factories.size() > 1) {
// there should only ever be one DiscoveryClient, but there might be more than
// one factory
log.warn("More than one implementation " + "of @" + getSimpleName()
+ " (now relying on @Conditionals to pick one): " + factories);
} return factories.toArray(new String[factories.size()]);
}

SpringFactoriesLoader调用loadFactoryNames其实加载META-INF/spring.factories下的class。

spring-cloud-netflix-eureka-client\src\main\resources\META-INF\spring.factories中配置:

org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
org.springframework.cloud.netflix.eureka.config.EurekaClientConfigServerAutoConfiguration,\
org.springframework.cloud.netflix.eureka.config.EurekaDiscoveryClientConfigServiceAutoConfiguration,\
org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration,\
org.springframework.cloud.netflix.ribbon.eureka.RibbonEurekaAutoConfiguration org.springframework.cloud.bootstrap.BootstrapConfiguration=\
org.springframework.cloud.netflix.eureka.config.EurekaDiscoveryClientConfigServiceBootstrapConfiguration org.springframework.cloud.client.discovery.EnableDiscoveryClient=\
org.springframework.cloud.netflix.eureka.EurekaDiscoveryClientConfiguration

1.1 EurekaClientAutoConfiguration

1.1.1 定义HasFeatures Bean

    @Bean
public HasFeatures eurekaFeature() {
return HasFeatures.namedFeature("Eureka Client", EurekaClient.class);
}

1.1.2 定义EurekaClientConfigBean bean

    @Bean
@ConditionalOnMissingBean(value = EurekaClientConfig.class, search = SearchStrategy.CURRENT)
public EurekaClientConfigBean eurekaClientConfigBean() {
EurekaClientConfigBean client = new EurekaClientConfigBean();
if ("bootstrap".equals(this.env.getProperty("spring.config.name"))) {
// We don't register during bootstrap by default, but there will be another
// chance later.
client.setRegisterWithEureka(false);
}
return client;
}

1.1.3 定义EurekaInstanceConfigBean bean

@Bean
@ConditionalOnMissingBean(value = EurekaInstanceConfig.class, search = SearchStrategy.CURRENT)
public EurekaInstanceConfigBean eurekaInstanceConfigBean(InetUtils inetUtils) {
EurekaInstanceConfigBean instance = new EurekaInstanceConfigBean(inetUtils);
instance.setNonSecurePort(this.nonSecurePort);
instance.setInstanceId(getDefaultInstanceId(this.env)); if (this.managementPort != this.nonSecurePort && this.managementPort != 0) {
if (StringUtils.hasText(this.hostname)) {
instance.setHostname(this.hostname);
}
RelaxedPropertyResolver relaxedPropertyResolver = new RelaxedPropertyResolver(env, "eureka.instance.");
String statusPageUrlPath = relaxedPropertyResolver.getProperty("statusPageUrlPath");
String healthCheckUrlPath = relaxedPropertyResolver.getProperty("healthCheckUrlPath");
if (StringUtils.hasText(statusPageUrlPath)) {
instance.setStatusPageUrlPath(statusPageUrlPath);
}
if (StringUtils.hasText(healthCheckUrlPath)) {
instance.setHealthCheckUrlPath(healthCheckUrlPath);
}
String scheme = instance.getSecurePortEnabled() ? "https" : "http";
instance.setStatusPageUrl(scheme + "://" + instance.getHostname() + ":"
+ this.managementPort + instance.getStatusPageUrlPath());
instance.setHealthCheckUrl(scheme + "://" + instance.getHostname() + ":"
+ this.managementPort + instance.getHealthCheckUrlPath());
}
return instance;
}

1.1.4 定义DiscoveryClient bean

    @Bean
public DiscoveryClient discoveryClient(EurekaInstanceConfig config,
EurekaClient client) {
return new EurekaDiscoveryClient(config, client);
}

1.1.5 定义EurekaServiceRegistry bean

    @Bean
public EurekaServiceRegistry eurekaServiceRegistry() {
return new EurekaServiceRegistry();
}

1.1.6 定义EurekaRegistration bean

    @Bean
@ConditionalOnBean(AutoServiceRegistrationProperties.class)
@ConditionalOnProperty(value = "spring.cloud.service-registry.auto-registration.enabled", matchIfMissing = true)
public EurekaRegistration eurekaRegistration(EurekaClient eurekaClient, CloudEurekaInstanceConfig instanceConfig, ApplicationInfoManager applicationInfoManager) {
return EurekaRegistration.builder(instanceConfig)
.with(applicationInfoManager)
.with(eurekaClient)
.with(healthCheckHandler)
.build();
}

1.1.7 定义EurekaAutoServiceRegistration bean

    @Bean
@ConditionalOnBean(AutoServiceRegistrationProperties.class)
@ConditionalOnProperty(value = "spring.cloud.service-registry.auto-registration.enabled", matchIfMissing = true)
public EurekaAutoServiceRegistration eurekaAutoServiceRegistration(ApplicationContext context, EurekaServiceRegistry registry, EurekaRegistration registration) {
return new EurekaAutoServiceRegistration(context, registry, registration);
}
1.2 EurekaClientConfiguration
1.2.1 定义EurekaClient bean
        @Bean(destroyMethod = "shutdown")
@ConditionalOnMissingBean(value = EurekaClient.class, search = SearchStrategy.CURRENT)
public EurekaClient eurekaClient(ApplicationInfoManager manager,
EurekaClientConfig config) {
return new CloudEurekaClient(manager, config, this.optionalArgs,
this.context);
}

1.2.2 定义ApplicationInfoManager bean

        @Bean
@ConditionalOnMissingBean(value = ApplicationInfoManager.class, search = SearchStrategy.CURRENT)
public ApplicationInfoManager eurekaApplicationInfoManager(
EurekaInstanceConfig config) {
InstanceInfo instanceInfo = new InstanceInfoFactory().create(config);
return new ApplicationInfoManager(config, instanceInfo);
}

1.3 RefreshableEurekaClientConfiguration

1.3.1 定义EurekaClient bean

        @Bean(destroyMethod = "shutdown")
@ConditionalOnMissingBean(value = EurekaClient.class, search = SearchStrategy.CURRENT)
@org.springframework.cloud.context.config.annotation.RefreshScope
@Lazy
public EurekaClient eurekaClient(ApplicationInfoManager manager,
EurekaClientConfig config, EurekaInstanceConfig instance) {
manager.getInfo(); // force initialization
return new CloudEurekaClient(manager, config, this.optionalArgs,
this.context);
}

1.3.2 定义ApplicationInfoManager

        @Bean
@ConditionalOnMissingBean(value = ApplicationInfoManager.class, search = SearchStrategy.CURRENT)
@org.springframework.cloud.context.config.annotation.RefreshScope
@Lazy
public ApplicationInfoManager eurekaApplicationInfoManager(
EurekaInstanceConfig config) {
InstanceInfo instanceInfo = new InstanceInfoFactory().create(config);
return new ApplicationInfoManager(config, instanceInfo);
}
参考文献:
http://blog.csdn.net/neosmith/article/details/53131023

Spring Cloud Netflix Eureka client源码分析的更多相关文章

  1. Spring Cloud学习 之 Spring Cloud Ribbon(负载均衡器源码分析)

    文章目录 AbstractLoadBalancer: BaseLoadBalancer: DynamicServerListLoadBalancer: ServerList: ServerListUp ...

  2. Spring Cloud 学习 之 Spring Cloud Eureka(源码分析)

    Spring Cloud 学习 之 Spring Cloud Eureka(源码分析) Spring Boot版本:2.1.4.RELEASE Spring Cloud版本:Greenwich.SR1 ...

  3. Spring Boot 揭秘与实战 源码分析 - 开箱即用,内藏玄机

    文章目录 1. 开箱即用,内藏玄机 2. 总结 3. 源代码 Spring Boot提供了很多”开箱即用“的依赖模块,那么,Spring Boot 如何巧妙的做到开箱即用,自动配置的呢? 开箱即用,内 ...

  4. 【原】Spark中Client源码分析(二)

    继续前一篇的内容.前一篇内容为: Spark中Client源码分析(一)http://www.cnblogs.com/yourarebest/p/5313006.html DriverClient中的 ...

  5. Spring Boot 揭秘与实战 源码分析 - 工作原理剖析

    文章目录 1. EnableAutoConfiguration 帮助我们做了什么 2. 配置参数类 – FreeMarkerProperties 3. 自动配置类 – FreeMarkerAutoCo ...

  6. Spring Environment(二)源码分析

    Spring Environment(二)源码分析 Spring 系列目录(https://www.cnblogs.com/binarylei/p/10198698.html) Spring Envi ...

  7. Spring Cloud Netflix Eureka源码导读与原理分析

    Spring Cloud Netflix技术栈中,Eureka作为服务注册中心对整个微服务架构起着最核心的整合作用,因此对Eureka还是有很大的必要进行深入研究. 本文主要分为四部分,一是对项目构建 ...

  8. 曹工说mini-dubbo(2)--分析eureka client源码,想办法把我们的服务提供者注册到eureka server(上)

    前言 eureka是spring cloud Netflix技术体系中的重要组件,主要完成服务注册和发现的功能:那现在有个问题,我们自己写的rpc服务,如果为了保证足够的开放性和功能完善性,那肯定要支 ...

  9. 微服务生态组件之Spring Cloud OpenFeign详解和源码分析

    Spring Cloud OpenFeign 概述 Spring Cloud OpenFeign 官网地址 https://spring.io/projects/spring-cloud-openfe ...

随机推荐

  1. 《剑指offer》数值的整数次方

    一.题目描述 给定一个double类型的浮点数base和int类型的整数exponent.求base的exponent次方. 二.输入 double base, int exponent 三.输出 b ...

  2. jsLittle源码封装对象合并

    JSLi.extend = JSLi.fn.extend = function () { var options, name, src, copy, target = arguments[0],i = ...

  3. Linux和Windows系统的远程桌面访问知识(转载)

    为新手讲解Linux和Windows系统的远程桌面访问知识   很多新手都是使用Linux和Windows双系统的,它们之间的远程桌面访问是如何连接的,我们就为新手讲解Linux和Windows系统的 ...

  4. Unity 实现Log实时输出到屏幕或控制台上<二>

    本文章由cartzhang编写,转载请注明出处. 所有权利保留. 文章链接:http://blog.csdn.net/cartzhang/article/details/49884507 作者:car ...

  5. COGS——T 1215. [Tyvj Aug11] 冗余电网

    http://www.cogs.pro/cogs/problem/problem.php?pid=1215 ★   输入文件:ugrid.in   输出文件:ugrid.out   简单对比时间限制: ...

  6. 洛谷 P2695 骑士的工作

    P2695 骑士的工作 题目背景 你作为一个村的村长,保卫村庄是理所当然的了.今天,村庄里来了一只恶龙,他有n个头,恶龙到处杀人放火.你着急了.不过天无绝人之路,现在来了一个骑士团.里面有m位成员(往 ...

  7. ArcGIS api for javascript——放大时切换图层

    描述 本例展示了如何在地图里指出显示的缓存或切片的细节等级(LODs).当打开示例地图,可以看到一些来自ArcGIS Online ESRI_Imagery_World_2D图层的影像.这个应用程序配 ...

  8. hdu 1757 矩阵连乘

  9. [Python] Indexing An Array With Another Array with numpy

    NumPy Reference: Indexing Integer array indexing: Select array elements with another array def index ...

  10. OpenGl 坐标转换

    1. OpenGL 渲染管线 OpenGL渲染管线分为两大部分,模型观測变换(ModelView Transformation)和投影变换(Projection Transformation). 做个 ...