Class InstrumentationProvider

java.lang.Object

org.jrd.agent.InstrumentationProvider

public class InstrumentationProvider
extends 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	Description
private static final String	INFO_DELIMITER
private final Instrumentation	instrumentation
private final String	loneliness
private final String	origArgs
private final Transformer	transformer

Constructor Summary

Constructors

Constructor	Description
InstrumentationProvider(Instrumentation inst, Transformer transformer, String loneliness, String origArgs)

Method Summary

Modifier and Type	Method	Description
void	addClass(String className, byte[] b)	Tis was originally solved by custom classloader which had map(string, byte[]) and map(string, clazz).
void	addJar(String jarOrigName, byte[] decoded)
private static boolean	classloaderMatches(String classlaoder, Class loadedClass)
int	cleanOverrides(String pattern)
void	detach()
private Class	findClass(String className, String classLoader)
byte[]	findClassBody(String className, String classloader)	Finds class object corresponding to the class name and returns its bytecode.
(package private) byte[]	getClassBody(Class clazz, String classloader)
void	getClasses(BlockingQueue<String> queue, Boolean abort, boolean doGetInfo, Optional<ClassFilter> filter, String classlaoder)	Inserts names of classes into queue.
void	getOverrides(BlockingQueue<String> queue)
void	setClassBody(String cname, byte[] nwBody, String classloader)

Methods inherited from class Object

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

Field Details

transformer

private final Transformer transformer

instrumentation

private final Instrumentation instrumentation

loneliness

private final String loneliness

origArgs

private final String origArgs

INFO_DELIMITER

private static final String INFO_DELIMITER

See Also:

• Constant Field Values

Constructor Details

InstrumentationProvider

InstrumentationProvider(Instrumentation inst,
 Transformer transformer,
 String loneliness,
 String origArgs)

Method Details

setClassBody

public void setClassBody(String cname,
 byte[] nwBody,
 String classloader)
                  throws UnmodifiableClassException

Throws:

UnmodifiableClassException

getClassBody

byte[] getClassBody(Class clazz,
 String classloader)
             throws UnmodifiableClassException

Throws:

UnmodifiableClassException

findClassBody

public byte[] findClassBody(String className,
 String classloader)
                     throws 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:

UnmodifiableClassException - if the class can not be re-transformed

findClass

private Class findClass(String className,
 String classLoader)

getClasses

public void getClasses(BlockingQueue<String> queue,
 Boolean abort,
 boolean doGetInfo,
 Optional<ClassFilter> filter,
 String classlaoder)
                throws InterruptedException

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

Parameters:

queue - output queue

abort - abort signal

Throws:

InterruptedException - interrupted exception

classloaderMatches

private static boolean classloaderMatches(String classlaoder,
 Class loadedClass)

getOverrides

public void getOverrides(BlockingQueue<String> queue)
                  throws InterruptedException

Throws:

InterruptedException

cleanOverrides

public int cleanOverrides(String pattern)

detach

public void detach()

addClass

public void addClass(String className,
 byte[] b)
              throws NoSuchMethodException,
InvocationTargetException,
IllegalAccessException,
ClassNotFoundException

Tis was originally solved by custom classloader which had map(string, byte[]) and map(string, clazz). However such class, although visible in class listing and by decompilers, was not usable in tunrime compilation, nor eg initialized by class.forName. The class.forName is good test or the class being correctly loaded

The reflection could be avoided by doing fake classlaoder which was publishing defineClass method and friends, but they are final now

Waring! Do not work with target process JDK17, that would eed --add-opens java.base or similar:(

Throws:

NoSuchMethodException

InvocationTargetException

IllegalAccessException

ClassNotFoundException

addJar

public void addJar(String jarOrigName,
 byte[] decoded)
            throws IOException

Throws:

IOException