Package com.avrix.agent

Class AgentTransformer

java.lang.Object

com.avrix.agent.AgentTransformer

All Implemented Interfaces:

ClassFileTransformer

public class AgentTransformer
extends Object
implements ClassFileTransformer

The class represents a class transformer, used to change classes at boot time. It implements the ClassFileTransformer interface, which allows you to change the byte code of classes before they are loaded into the JVM.

Constructor Summary

Constructors

Constructor	Description
AgentTransformer()

Method Summary

Modifier and Type	Method	Description
byte[]	transform(ClassLoader loader, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer)	The transform method is called for each class that is loaded into the JVM.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.instrument.ClassFileTransformer

transform

Constructor Details

AgentTransformer

public AgentTransformer()

Method Details

transform

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

The transform method is called for each class that is loaded into the JVM. It takes the byte code of the original class and returns the modified byte code. This method implementation calls the getModifyClass method of the AgentManager class to obtain the modified byte code of the class.

Specified by:

transform in interface ClassFileTransformer

Parameters:

loader - class of the loader that loads this class

className - full class name in class path format (delimited by '/')

classBeingRedefined - the class that is being overridden (can be null if the class is not being overridden)

protectionDomain - the protection domain in which the class runs

classfileBuffer - byte code of the original class

Returns:

the modified byte code of the class

Throws:

IllegalClassFormatException - if the class bytecode cannot be transformed