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。

    4.0.0
    io.mybatis
    xxxx-skywalking
    1.0

    
        8.10.0
    

    
        
        
            org.apache.skywalking
            apm-agent
            ${skywalking.version}
            provided
        
    

    
        
        ${project.artifactId}
    

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。