SpringCloud Nacos 【客户端】自动注册源码解析

逃离我推掉我的手 2022-10-18 01:37 199阅读 0赞

# 1 项目demo #

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## 1.1 pom ##

<dependencies>
            
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
            </dependency>
        </dependencies>

## 1.2 ProviderController ##

@RestController
    @RequestMapping("/provider")
    public class ProviderController { 
    
        @Value("${server.port}")
        private Integer port;
    
    
        @GetMapping("/hello")
        public String hello() { 
    
            return "server port: " + port + ", say: Hello World";
        }
    
    }

## 1.3 ProviderApplication ##

@SpringBootApplication
    public class ProviderApplication { 
    
        public static void main(String[] args) { 
    
            SpringApplication.run(ProviderApplication.class);
    
        }
    
    }

## 1.4 启动 ##

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# 2 静态源码解读 #

## 2.1 spring.factories ##

**描述：** springboot 自动装配原理，查看nacos包下面的 spring.factories文件。找到NacosServiceRegistryAutoConfiguration类，该类作用是nacos服务自动装配。  
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## 2.2 NacosServiceRegistryAutoConfiguration ##

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## 2.3 NacosAutoServiceRegistration ##

**描述：** 查看当前类图。发现当前类实现了ApplicationListener接口，及有监听事件。  
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**描述：** 查看监听事件。监听事件在其父类AbstractAutoServiceRegistration里。  
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**描述：** 跟踪bind方法。  
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**描述：** 进入start方法。  
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**描述：** 进入NacosAutoServiceRegistration类 register 方法。  
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**描述：** 进入AbstractAutoServiceRegistration 类register方法。  
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**描述：** 既然怒NacosServiceRegistry类register方法。

@Override
    	public void register(Registration registration) { 
    
    		if (StringUtils.isEmpty(registration.getServiceId())) { 
    			log.warn("No service to register for nacos client...");
    			return;
    		}
            //获取namingService，serviceId、组id
    		NamingService namingService = namingService();
    		String serviceId = registration.getServiceId();
    		String group = nacosDiscoveryProperties.getGroup();
    		//封装注册实例
    		Instance instance = getNacosInstanceFromRegistration(registration);
    
    		try { 
    		    //注册
    			namingService.registerInstance(serviceId, group, instance);
    			log.info("nacos registry, {} {} {}:{} register finished", group, serviceId,
    					instance.getIp(), instance.getPort());
    		}
    		catch (Exception e) { 
    			log.error("nacos registry, {} register failed...{},", serviceId,
    					registration.toString(), e);
    			// rethrow a RuntimeException if the registration is failed.
    			// issue : https://github.com/alibaba/spring-cloud-alibaba/issues/1132
    			rethrowRuntimeException(e);
    		}
    	}

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**描述：** NacosNamingService 调用registerInstance 进行当前服务的注册。  
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# 3 Debug验证 #

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