com.newrelic.agent.instrumentation

Class AbstractClassTransformer

java.lang.Object

com.newrelic.agent.instrumentation.AbstractClassTransformer

All Implemented Interfaces:

StartableClassFileTransformer, java.lang.instrument.ClassFileTransformer

Direct Known Subclasses:

InterfaceMixinClassTransformer

public abstract class AbstractClassTransformer
extends java.lang.Object
implements StartableClassFileTransformer

Constructor Summary

Constructors

Constructor and Description
AbstractClassTransformer(int classreaderFlags)
AbstractClassTransformer(int classreaderFlags, boolean enabled)

Method Summary

Modifier and Type	Method and Description
protected int	getClassReaderFlags()
protected abstract org.objectweb.asm.ClassVisitor	getClassVisitor(org.objectweb.asm.ClassReader cr, org.objectweb.asm.ClassWriter cw, java.lang.String className, java.lang.ClassLoader loader)
protected boolean	isAbleToResolveAgent(java.lang.ClassLoader loader, java.lang.String className)
protected boolean	isEnabled() If this transformer is not enabled it won't be added to Instrumentation.
protected abstract boolean	isRetransformSupported()
protected abstract boolean	matches(java.lang.ClassLoader loader, java.lang.String className, java.lang.Class<?> classBeingRedefined, java.security.ProtectionDomain protectionDomain, byte[] classfileBuffer)
protected void	start() This is called by start(InstrumentationProxy, boolean) after this transformer has been added to Instrumentation.
void	start(InstrumentationProxy instrumentation, boolean isRetransformSupported) Start method to be called after this transformer is added to Instrumentation.
byte[]	transform(java.lang.ClassLoader loader, java.lang.String className, java.lang.Class<?> classBeingRedefined, java.security.ProtectionDomain protectionDomain, byte[] classfileBuffer)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AbstractClassTransformer

public AbstractClassTransformer(int classreaderFlags)

AbstractClassTransformer

public AbstractClassTransformer(int classreaderFlags,
                                boolean enabled)

Method Detail

transform

public byte[] transform(java.lang.ClassLoader loader,
                        java.lang.String className,
                        java.lang.Class<?> classBeingRedefined,
                        java.security.ProtectionDomain protectionDomain,
                        byte[] classfileBuffer)
                 throws java.lang.instrument.IllegalClassFormatException

Specified by:

transform in interface java.lang.instrument.ClassFileTransformer

Throws:

java.lang.instrument.IllegalClassFormatException

isAbleToResolveAgent

protected boolean isAbleToResolveAgent(java.lang.ClassLoader loader,
                                       java.lang.String className)

getClassReaderFlags

protected int getClassReaderFlags()

start

public void start(InstrumentationProxy instrumentation,
                  boolean isRetransformSupported)

Description copied from interface: StartableClassFileTransformer

Start method to be called after this transformer is added to Instrumentation.

Specified by:

start in interface StartableClassFileTransformer

start

protected void start()

This is called by start(InstrumentationProxy, boolean) after this transformer has been added to Instrumentation.

See Also:

Instrumentation.addTransformer(java.lang.instrument.ClassFileTransformer)

isEnabled

protected boolean isEnabled()

If this transformer is not enabled it won't be added to Instrumentation.

isRetransformSupported

protected abstract boolean isRetransformSupported()

getClassVisitor

protected abstract org.objectweb.asm.ClassVisitor getClassVisitor(org.objectweb.asm.ClassReader cr,
                                                                  org.objectweb.asm.ClassWriter cw,
                                                                  java.lang.String className,
                                                                  java.lang.ClassLoader loader)

matches

protected abstract boolean matches(java.lang.ClassLoader loader,
                                   java.lang.String className,
                                   java.lang.Class<?> classBeingRedefined,
                                   java.security.ProtectionDomain protectionDomain,
                                   byte[] classfileBuffer)