org.jrd.agent

Class InstrumentationProvider

java.lang.Object

org.jrd.agent.InstrumentationProvider

public class InstrumentationProvider
extends java.lang.Object

This class stores instrumentation and transformer objects and handles the transformation, retrieval of bytecode and class names.

Field Summary

Fields

Modifier and Type	Field and Description
private java.lang.instrument.Instrumentation	instrumentation
private Transformer	transformer

Constructor Summary

Constructors

Constructor and Description
InstrumentationProvider(java.lang.instrument.Instrumentation inst, Transformer transformer)

Method Summary

Modifier and Type	Method and Description
private java.lang.Class	findClass(java.lang.String className)
byte[]	findClassBody(java.lang.String className) Finds class object corresponding to the class name and returns its bytecode.
private byte[]	getClassBody(java.lang.Class clazz)
void	getClassesNames(java.util.concurrent.LinkedBlockingQueue<java.lang.String> queue, java.lang.Boolean abort) Inserts names of classes into queue.
void	setClassBody(java.lang.String cname, byte[] nwBody)

Methods inherited from class java.lang.Object

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

Field Detail

transformer

private final Transformer transformer

instrumentation

private final java.lang.instrument.Instrumentation instrumentation

Constructor Detail

InstrumentationProvider

InstrumentationProvider(java.lang.instrument.Instrumentation inst,
                        Transformer transformer)

Method Detail

setClassBody

public void setClassBody(java.lang.String cname,
                         byte[] nwBody)
                  throws java.lang.instrument.UnmodifiableClassException

Throws:

java.lang.instrument.UnmodifiableClassException

getClassBody

private byte[] getClassBody(java.lang.Class clazz)
                     throws java.lang.instrument.UnmodifiableClassException

Throws:

java.lang.instrument.UnmodifiableClassException

findClassBody

public byte[] findClassBody(java.lang.String className)
                     throws java.lang.instrument.UnmodifiableClassException

Finds class object corresponding to the class name and returns its bytecode.

Parameters:

className - name of class we want to get

Returns:

bytecode of given class

Throws:

java.lang.instrument.UnmodifiableClassException - if the class can not be retransformed

findClass

private java.lang.Class findClass(java.lang.String className)

getClassesNames

public void getClassesNames(java.util.concurrent.LinkedBlockingQueue<java.lang.String> queue,
                            java.lang.Boolean abort)
                     throws java.lang.InterruptedException

Inserts names of classes into queue. Stops execution when it receives abort signal.

Parameters:

queue - output queue

abort - abort signal

Throws:

java.lang.InterruptedException