Dubbo学习记录1

雨点打透心脏的1/2处 2023-01-21 10:29 176阅读 0赞

## 写在前面 ##

这里记录下springboot-dubbo的学习记录

*  准备  
    找到官方提供的示例项目，clone到本地开发工具，[项目地址][Link 1]

zookeeper 我这里用的 3.4.10 版本

还有zookeeper可视化工具 [下载地址][Link 2]，  
其实还有个 Dubbo-server-admin，也可以监控Dubbo服务，路由监控和发起RPC调用等.

## 一、启动 Zookeeper和可视化工具 ##

*  windows窗口，双击zkServer.cmd或者命令行启动
 *  zk 可视化，解压后进入build目录执行命令  
    `java -jar zookeeper-dev-ZooInspector.jar`

## 二、测试registry-samples --> zookeeper ##

先启动provider，再启动comsumer

### 2.1 Provider配置、使用 ###

application.properties

# Spring boot application
    spring.application.name=dubbo-registry-zookeeper-provider-sampleLS
    # Base packages to scan Dubbo Component: @org.apache.dubbo.config.annotation.Service
    dubbo.scan.base-packages=org.apache.dubbo.spring.boot.sample.provider.service
    
    # Dubbo Application
    ## The default value of dubbo.application.name is ${spring.application.name}
    ## dubbo.application.name=${spring.application.name}
    
    # Dubbo Protocol
    dubbo.protocol.name=dubbo
    ## Random port
    dubbo.protocol.port=-1
    
    ## Dubbo Registry
    dubbo.registry.address=zookeeper://127.0.0.1:2181
    dubbo.registry.file = ${user.home}/dubbo-cache/${spring.application.name}/dubbo.cache
    
    ## DemoService version
    demo.service.version=1.0.0

使用时用 DubboService，这里只是简单使用，还可以配置并发数，token等等

@DubboService(version = "${demo.service.version}")
    public class DefaultDemoService implements DemoService {
    
        /**
         * The default value of ${dubbo.application.name} is ${spring.application.name}
         */
        @Value("${dubbo.application.name}")
        private String serviceName;
    
        @Override
        public String sayHello(String name) {
            return String.format("[%s] : Hello, %s", serviceName, name);
        }
    }

### 2.2 Consumer ###

application.properties

spring:
      application:
        name: dubbo-registry-zookeeper-consumer-sampleLS
    
    demo:
      service:
        version: 1.0.0
    
    embedded:
      zookeeper:
        port: 2181
    
    dubbo:
      registry:
        address: zookeeper://127.0.0.1:${embedded.zookeeper.port}
        file: ${user.home}/dubbo-cache/${spring.application.name}/dubbo.cache

使用，这种注入@DubboReference(version = “$\{demo.service.version\}”),还可以配置 缓存，存根，负载均衡，参数等等

@DubboReference(version = "${demo.service.version}")
        private DemoService demoService;
    
        public ApplicationRunner runner() {
            return args -> logger.info(demoService.sayHello("mercyblitz"));
        }

### 2.3 ZK可视化，查看Dubbo服务节点元数据 ###

![ZK可视化][ZK]

## 三、测试 service-introspection-samples ##

这里涉及配置 dubbo.application.metadata-type=composite

参考ISSUE-Dubbo 2.7.8需要将本地和远程MetadataService组合为默认实现，本地MetadataService的优先级将高于远程的优先级。

[Link 1]: https://github.com/apache/dubbo-spring-boot-project.git
[Link 2]: https://issues.apache.org/jira/secure/attachment/12436620/ZooInspector.zip
[ZK]: /images/20221020/fea54233629e45ebb082a9ebf10f57aa.png