dubbo xml 工程搭建

原创已于 2023-06-16 06:19:05 修改 · 904 阅读

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于 2023-05-14 21:45:41 首次发布

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整体链路调用的流程：

① 消费者通过 Interface 进行方法调用，统一交由消费者端的 Proxy 通过 ProxyFactory 来进行代理对象的创建，使用到了 jdk javassist 技术

② 交给 Filter 这个模块，做一个统一的过滤请求，在 SPI 案例中涉及过

③ 接下来会进入最主要的 Invoker 调用逻辑

通过 Directory 去配置中读取信息，最终通过 list 方法获取所有的 Invoker

通过 Cluster 模块根据选择的具体路由规则来选取 Invoke 列表

通过 LoadBalance模块，根据负载均衡策略，选择一个具体的 Invoker 来处理我们的请求

如果执行中出现错误，并且 Consumer 配置类重试机制，则会重新尝试执行

④ 继续经过 Filter 进行执行功能的前后封装 Invoker 选择具体的执行协议

⑤ 客户端进行编码和序列化，然后发送数据

⑥ 到达 Consumer 中的 Server 在这里进行反编码和反序列化的接收数据

⑦ 使用 Exporter 选择执行器

⑧ 交给 Filter 进行一个提供者端的过滤，到达 Invoker 执行器

⑨ 通过 Invoker 调用接口的具体实现，然后返回

1、新建主工程，pom 文件如下：

<properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
        <dubbo.version>2.7.5</dubbo.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.apache.dubbo</groupId>
                <artifactId>dubbo</artifactId>
                <version>${dubbo.version}</version>
            </dependency>
            <dependency>
                <groupId>org.apache.dubbo</groupId>
                <artifactId>dubbo-common</artifactId>
                <version>${dubbo.version}</version>
            </dependency>
            <dependency>
                <groupId>org.apache.dubbo</groupId>
                <artifactId>dubbo-registry-zookeeper</artifactId>
                <version>${dubbo.version}</version>
            </dependency>
            <dependency>
                <groupId>org.apache.dubbo</groupId>
                <artifactId>dubbo-registry-nacos</artifactId>
                <version>${dubbo.version}</version>
            </dependency>
            <dependency>
                <groupId>org.apache.dubbo</groupId>
                <artifactId>dubbo-rpc-dubbo</artifactId>
                <version>${dubbo.version}</version>
            </dependency>
            <dependency>
                <groupId>org.apache.dubbo</groupId>
                <artifactId>dubbo-remoting-netty4</artifactId>
                <version>${dubbo.version}</version>
            </dependency>
            <dependency>
                <groupId>org.apache.dubbo</groupId>
                <artifactId>dubbo-serialization-hessian2</artifactId>
                <version>${dubbo.version}</version>
            </dependency>
            <dependency>
                <groupId>org.apache.dubbo</groupId>
                <artifactId>dubbo-config-spring</artifactId>
                <version>${dubbo.version}</version>
            </dependency>
        </dependencies>

    </dependencyManagement>

    <dependencies>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.5</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.5</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.47</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

2、新建子模块，公共api，主要是接口

public interface HelloService {
    String sayHello(String name);
}

3、新建子模块生产者，pom 文件如下

<dependencies>
        <dependency>
            <groupId>org.example</groupId>
            <artifactId>service-api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-registry-zookeeper</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-rpc-dubbo</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-remoting-netty4</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-serialization-hessian2</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-config-spring</artifactId>
        </dependency>
    </dependencies>

新建生产者实现类

public class HelloServiceImpl implements HelloService {
    @Override
    public String sayHello(String name) {
        try {
            TimeUnit.SECONDS.sleep(5);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        return "hello:" + name;
    }
}

配置文件：dubbo-provider.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:dubbo="http://dubbo.apache.org/schema/dubbo"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://dubbo.apache.org/schema/dubbo
       http://dubbo.apache.org/schema/dubbo/dubbo.xsd">
    <!--提供应用方信息，用于计算依赖关系-->
       <dubbo:application name="service-provider"/>
    <!--使用zookeeper注册中心暴露服务地址-->
       <dubbo:registry address="zookeeper://101.132.167.18:2181?timeout=30000" id="r1"/>
    <!--使用dubbo协议在20882端口暴露服务,也可以使用 rmi 协议暴露-->
    <dubbo:protocol name="dubbo" port="20882"/>
    <!--声明需要暴露的服务接口-->
    <dubbo:service interface="com.lagou.service.HelloService" ref="helloService"/>
    <!--和本地bean一样实现服务-->
    <bean id="helloService" class="com.lagou.service.impl.HelloServiceImpl"/>

</beans>

配置文件：log4j.properties

log4j.rootCategory=INFO,CONSOLE

log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%d{HH:mm:ss.SSS} [%t] %-5p %c.%M\(%F:%L\) - %m%n

启动类：

public class ProviderApplication {
    public static void main(String[] args) throws IOException {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("classpath:dubbo-provider.xml");
        context.start();
        System.in.read();
    }
}

4、新建子模块消费者，pom 文件如下：

<dependencies>
        <dependency>
            <groupId>org.example</groupId>
            <artifactId>service-api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-registry-zookeeper</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-rpc-dubbo</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-remoting-netty4</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-serialization-hessian2</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-config-spring</artifactId>
        </dependency>
    </dependencies>

客户端调用类：

public class ConsumerApplication {
    public static void main(String[] args) {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("classpath:dubbo-consumer.xml");
        HelloService helloService = (HelloService) context.getBean("helloService");
        String result = helloService.sayHello("world");
        System.out.println("--------------" + result);
    }
}



public class HelloServiceMock implements HelloService{
    @Override
    public String sayHello(String name) {
        return "hello mock";
    }
}

配置文件：dubbo-consumer.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:dubbo="http://dubbo.apache.org/schema/dubbo"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://dubbo.apache.org/schema/dubbo
       http://dubbo.apache.org/schema/dubbo/dubbo.xsd">
    <!--提供应用方信息，用于计算依赖关系-->
    <dubbo:application name="service-consumer">
        <dubbo:parameter key="qos.enable" value="true"/>
        <dubbo:parameter key="qos.port" value="33333"/>
        <!--是否可以远程调用，默认是true-->
        <dubbo:parameter key="qos.accept.foreign.ip" value="false"/>
    </dubbo:application>
    <!--设置超时时间,超时以后走mock 本地类,如果接口上也配置超时时间，以consumer配置时间为准-->
    <dubbo:consumer timeout="2000" check="false" retries="3"/>
    <!--使用zookeeper注册中心暴露服务地址-->
       <dubbo:registry address="zookeeper://101.132.167.18:2181?timeout=30000"/>
    <!--生成远程服务代理，可以和本地bean一样使用demoService-->
    <dubbo:reference id="helloService" interface="com.lagou.service.HelloService" mock="true" timeout="2000"/>

</beans>

配置文件：log4j.properties

log4j.rootCategory=ERROR,CONSOLE

log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%d{HH:mm:ss.SSS} [%t] %-5p %c.%M\(%F:%L\) - %m%n

启动类：

public class ConsumerApplication {
    public static void main(String[] args) {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("classpath:dubbo-consumer.xml");
        HelloService helloService = (HelloService) context.getBean("helloService");
        String result = helloService.sayHello("world");
        System.out.println("--------------" + result);
    }
}