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Skywalking Java 插件开发太简单了


在写 ​​Skywalking Java 插件开发注意点​​​ 时,就感觉不舒服,扩展不应该这么麻烦,既然 ​​skywalking-agent​​​ 中存在第三方的类,直接用不就好了吗,何必用 ​​maven-shade-plugin​​ 这么麻烦。经过验证,确实很简单。

pom.xml 依赖

<?xml version="1.0" encoding="UTF-8"?>
<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>io.mybatis</groupId>
<artifactId>xxxx-skywalking</artifactId>
<version>1.0</version>

<properties>
<skywalking.version>8.10.0</skywalking.version>
</properties>

<dependencies>
<!-- TODO 你自己的依赖 -->
<dependency>
<groupId>org.apache.skywalking</groupId>
<artifactId>apm-agent</artifactId>
<version>${skywalking.version}</version>
<scope>provided</scope>
</dependency>
</dependencies>

<build>
<!-- 插件打包可以不带版本号,避免放入plugins多个版本 -->
<finalName>${project.artifactId}</finalName>
</build>
</project>

这么简单就够了。​​apm-agent​​​ 中包含了 ​​net.bytebuddy​​​,不必使用 ​​apm-agent-core​​。

实现的代码中,​​import​​​ 的就是 skywalking 经过 ​​maven-shade-plugin​​ 处理后的包。

拦截定义中的 import 示例:

import org.apache.skywalking.apm.agent.core.plugin.interceptor.ConstructorInterceptPoint;
import org.apache.skywalking.apm.agent.core.plugin.interceptor.InstanceMethodsInterceptPoint;
import org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.ClassInstanceMethodsEnhancePluginDefine;
import org.apache.skywalking.apm.agent.core.plugin.match.ClassAnnotationMatch;
import org.apache.skywalking.apm.agent.core.plugin.match.ClassMatch;
import org.apache.skywalking.apm.dependencies.net.bytebuddy.description.method.MethodDescription;
import org.apache.skywalking.apm.dependencies.net.bytebuddy.matcher.ElementMatcher;

import static org.apache.skywalking.apm.agent.core.plugin.match.MethodInheritanceAnnotationMatcher.byMethodInheritanceAnnotationMatcher;
import static org.apache.skywalking.apm.dependencies.net.bytebuddy.matcher.ElementMatchers.namedOneOf;

拦截方法中的 import 示例:

import org.apache.skywalking.apm.agent.core.context.ContextManager;
import org.apache.skywalking.apm.agent.core.context.tag.StringTag;
import org.apache.skywalking.apm.agent.core.context.tag.Tags;
import org.apache.skywalking.apm.agent.core.context.trace.AbstractSpan;
import org.apache.skywalking.apm.agent.core.context.trace.SpanLayer;
import org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.EnhancedInstance;
import org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.InstanceMethodsAroundInterceptor;
import org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.MethodInterceptResult;
import org.apache.skywalking.apm.dependencies.com.google.gson.Gson;
import org.apache.skywalking.apm.dependencies.com.google.gson.GsonBuilder;
import org.apache.skywalking.apm.network.trace.component.Component;
import org.apache.skywalking.apm.network.trace.component.OfficialComponent;

直接用内部的 ​​org.apache.skywalking.apm.dependencies.com.google.gson.Gson​​。


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