快速学习-Skywalking的RPC调用-Dubbo的最佳实践

3.Skywalking高级

3.1 Rpc调用监控

Skywalking(6.5.0)支持的Rpc框架有以下几种：

• Dubbo 2.5.4 -> 2.6.0 (原生的Dubbo)
• Dubbox 2.8.4 (当当网改编后的Dubbo)
• Apache Dubbo 2.7.0 (捐献至Apache后的Dubbo)
• Motan 0.2.x -> 1.1.0
• gRPC 1.x
• Apache ServiceComb Java Chassis 0.1 -> 0.5,1.0.x
• SOFARPC 5.4.0

接下来为大家提供一些简单使用Dubbo服务调用的项目代码演示, 大家可以参考下面简单版
或者详细请参照Demo中的脚手架示例scaffold-dubbo-demo

3.1.1 服务提供方

pom文件：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0modelVersion>
    <parent>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-starter-parentartifactId>
        <version>2.1.10.RELEASEversion>
        <relativePath/> 
    parent>
    <groupId>com.sf.saasgroupId>
    <artifactId>skywalking_dubbo_providerartifactId>
    <version>0.0.1-SNAPSHOTversion>
    <name>skywalking_dubbo_providername>
    <description>Demo project for Spring Bootdescription>

    <properties>
        <java.version>1.8java.version>
    properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>

        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
        dependency>

        
        <dependency>
            <groupId>com.alibaba.spring.bootgroupId>
            <artifactId>dubbo-spring-boot-starterartifactId>
            <version>2.0.0version>
        dependency>
    dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.bootgroupId>
                <artifactId>spring-boot-maven-pluginartifactId>
            plugin>
        plugins>
    build>

project>

application.properties

spring.application.name=skywalking_dubbo_provider spring.dubbo.server=true 
spring.dubbo.registry=N/A 
server.port=8086

为了简化环境搭建，采用了本地直接调用的方式，所以将注册中心写成N/A表示不注册到注册中 心。

IHelloService接口：.

public interface IHelloService { 
    String hello(); 
}

IHelloServiceImpl实现类

import com.alibaba.dubbo.config.annotation.Service; import com.itcast.api.IHelloService; 
import org.springframework.stereotype.Component; 

@Service(interfaceClass = IHelloService.class) 
@Component 
public class HelloServiceImpl implements IHelloService { 
    @Override 
    public String hello() { 
        return "hello skywalking"; 
    } 
}

SkywalkingDubboProviderApplication启动类

import com.alibaba.dubbo.spring.boot.annotation.EnableDubboConfiguration;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
//添加dubbo生效注解
@EnableDubboConfiguration
public class SkywalkingDubboProviderApplication {

    public static void main(String[] args) {
        SpringApplication.run(SkywalkingDubboProviderApplication.class, args);
    }

}

需要添加@EnableDubboConfiguration注解

3.1.2 服务消费方

pom文件：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0modelVersion>
    <parent>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-starter-parentartifactId>
        <version>2.1.10.RELEASEversion>
        <relativePath/> 
    parent>
    <groupId>com.sf.saasgroupId>
    <artifactId>skywalking_dubbo_consumerartifactId>
    <version>0.0.1-SNAPSHOTversion>
    <name>skywalking_dubbo_consumername>
    <description>Demo project for Spring Bootdescription>

    <properties>
        <java.version>1.8java.version>
    properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>

        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
        dependency>

        <dependency>
            <groupId>com.alibaba.spring.bootgroupId>
            <artifactId>dubbo-spring-boot-starterartifactId>
            <version>2.0.0version>
        dependency>
    dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.bootgroupId>
                <artifactId>spring-boot-maven-pluginartifactId>
            plugin>
        plugins>
    build>

project>

application.properties

spring.application.name=skywalking_dubbo_consumer
server.port=8085

IHelloService接口

public interface IHelloService {
    String hello();
}

TestController

import com.alibaba.dubbo.config.annotation.Reference;
import com.itcast.api.IHelloService;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class TestController {
    @Reference(url = "dubbo://127.0.0.1:20880")
    private IHelloService helloService;

    @GetMapping("/hello")
    public String hello(){
        return helloService.hello();
    }
}

采用直连而非从注册中心获取服务地址的方式，在@Reference注解中声明

url = “dubbo://127.0.0.1:20880”

SkywalkingDubboConsumerApplication

import com.alibaba.dubbo.spring.boot.annotation.EnableDubboConfiguration;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
//添加dubbo生效注解
@EnableDubboConfiguration
public class SkywalkingDubboConsumerApplication {

    public static void main(String[] args) {
        SpringApplication.run(SkywalkingDubboConsumerApplication.class, args);
    }

}

需要添加@EnableDubboConfiguration注解

3.1.3 部署方式

1、将上述两个项目使用package打包后上传至/usr/local/skywalking目录下。
2、首先我们复制两份agent，防止使用的冲突。

cd /usr/local/skywalking/apache-skywalking-apm-bin/ cp -r agent agent_dubbo_provider 
cp -r agent agent_dubbo_consumer 
vi agent_dubbo_provider/config/agent.config

修改agent_dubbo_provider配置中的应用名为：

# The service name in UI 
agent.service_name=${SW_AGENT_NAME:dubbo_provider}

接着修改agent_dubbo_consumer

vi agent_dubbo_consumer/config/agent.config

修改应用名

# The service name in UI 
agent.service_name=${SW_AGENT_NAME:dubbo_consumer}

3、先启动provider，等待启动成功

#切换到目录下 
cd /usr/local/skywalking 
#启动provider 
java -javaagent:/usr/local/skywalking/apache-skywalking-apm- bin/agent_dubbo_provider/skywalking-agent.jar  -jar skywalking_dubbo_provider.jar &

出现如图所示内容，应用就已经启动成功了

4、启动consumer，等待启动成功。

#启动consumer 
java -javaagent:/usr/local/skywalking/apache-skywalking-apm- bin/agent_dubbo_consumer/skywalking-agent.jar  -jar skywalking_dubbo_consumer.jar &

5、调用接口，接口地址为：http://虚拟机IP地址:8085/hello

6、此时如果页面显示

那么dubbo的调用就成功了。

7、打开skywalking查看dubbo调用的监控情况。

仪表盘

目前 dubbo_provider和 dubbo_consumer的服务已经出现，同时出现了两个接口分别是：

• /hello接口，是浏览器调用dubb_consumer的http接口
• IHelloService.hello()是dubbo_consumer调用dubbo_provider的dubbo接口

拓扑图

该图中已经表示出了一个调用的链路关系：

User(浏览器) ----> dubber_consumer ----> dubbo_provider 

并且在服务的上方标识出了每个服务代表的内容，dubbo_consumer是SpringMvc的服务，而 dubbo_provider是Dubbo的服务。

追踪

追踪图中显示本次调用耗时49ms，其中dubbo接口耗时29ms，那么另外的20ms其实是SpringMVC接 口的开销，这样就能很好的评估出每个环节的耗时时间。