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99 changes: 99 additions & 0 deletions
99
...rter/src/main/java/com/nepxion/discovery/agent/plugin/thread/ThreadTransformCallback.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| package com.nepxion.discovery.agent.plugin.thread; | ||
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| /** | ||
| * <p>Title: Nepxion Discovery</p> | ||
| * <p>Description: Nepxion Discovery</p> | ||
| * <p>Copyright: Copyright (c) 2017-2050</p> | ||
| * <p>Company: Nepxion</p> | ||
| * @author zifeihan | ||
| * @version 1.0 | ||
| */ | ||
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| import javassist.ClassPool; | ||
| import javassist.CtClass; | ||
| import javassist.CtConstructor; | ||
| import javassist.CtField; | ||
| import javassist.CtMethod; | ||
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| import java.lang.reflect.Method; | ||
| import java.security.ProtectionDomain; | ||
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| import com.nepxion.discovery.agent.async.AsyncContextAccessor; | ||
| import com.nepxion.discovery.agent.callback.TransformCallback; | ||
| import com.nepxion.discovery.agent.logger.AgentLogger; | ||
| import com.nepxion.discovery.agent.util.ClassInfo; | ||
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| public abstract class ThreadTransformCallback implements TransformCallback { | ||
| private static final AgentLogger LOG = AgentLogger.getLogger(ThreadTransformCallback.class.getName()); | ||
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| @Override | ||
| public byte[] doInTransform(ClassLoader classLoader, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer) { | ||
| try { | ||
| ClassInfo classInfo = new ClassInfo(className, classfileBuffer, classLoader); | ||
| CtClass ctClass = classInfo.getCtClass(); | ||
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| addField(ctClass, AsyncContextAccessor.class); | ||
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| CtConstructor[] declaredConstructors = ctClass.getDeclaredConstructors(); | ||
| for (CtConstructor ctConstructor : declaredConstructors) { | ||
| ctConstructor.insertAfter(ThreadConstant.CONSTRUCTOR_INTERCEPTOR); | ||
| } | ||
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| String implMethodName = getImplMethodName(); | ||
| CtMethod ctMethod = ctClass.getDeclaredMethod(implMethodName); | ||
| if (null != ctMethod) { | ||
| ctMethod.insertBefore(ThreadConstant.RUN_BEFORE_INTERCEPTOR); | ||
| ctMethod.insertAfter(ThreadConstant.RUN_AFTER_INTERCEPTOR); | ||
| } | ||
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| return ctClass.toBytecode(); | ||
| } catch (Exception e) { | ||
| LOG.warn(String.format("Transform %s error, message:", className), e); | ||
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| return null; | ||
| } | ||
| } | ||
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| public void addField(CtClass ctClass, Class<?> clazz) { | ||
| try { | ||
| ClassPool aDefault = ClassPool.getDefault(); | ||
| CtClass makeInterface = aDefault.makeInterface(clazz.getName()); | ||
| ctClass.addInterface(makeInterface); | ||
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| Method[] methods = clazz.getDeclaredMethods(); | ||
| if (methods.length != 2) { | ||
| throw new IllegalArgumentException("accessorType has to declare 2 methods. " + clazz.getName() + " has " + methods.length); | ||
| } | ||
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| Method getter; | ||
| Method setter; | ||
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| if (methods[0].getParameterTypes().length == 0) { | ||
| getter = methods[0]; | ||
| setter = methods[1]; | ||
| } else { | ||
| getter = methods[1]; | ||
| setter = methods[0]; | ||
| } | ||
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| Class<?> fieldType = getter.getReturnType(); | ||
| String fieldName = fieldType.getSimpleName().toLowerCase(); | ||
| String field = String.format("private %s %s;", fieldType.getName(), fieldName); | ||
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| CtField f1 = CtField.make(field, ctClass); | ||
| ctClass.addField(f1); | ||
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| String getMethod = String.format("public %s %s(){return %s;}", fieldType.getName(), getter.getName(), fieldName); | ||
| String setMethod = String.format("public void %s(%s %s){this.%s = %s;}", setter.getName(), fieldType.getName(), fieldName, fieldName, fieldName); | ||
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| CtMethod m1 = CtMethod.make(getMethod, ctClass); | ||
| CtMethod m2 = CtMethod.make(setMethod, ctClass); | ||
| ctClass.addMethod(m1); | ||
| ctClass.addMethod(m2); | ||
| } catch (Exception e) { | ||
| LOG.warn(String.format("Add field %s error, message:", clazz.getName()), e); | ||
| } | ||
| } | ||
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| public abstract String getImplMethodName(); | ||
| } |