org.codehaus.aspectwerkz.hook.impl
Class ClassPreProcessorHelper

java.lang.Object
  org.codehaus.aspectwerkz.hook.impl.ClassPreProcessorHelper

public class ClassPreProcessorHelper
extends Object

Helper class called by the modified java.lang.ClassLoader.

This class is called at different points by the modified java.lang.ClassLoader of the org.codehaus.aspectwerkz.hook.impl.ClassLoaderPreProcessorImpl implemention.
This class must reside in the -Xbootclasspath when AspectWerkz layer 1 is used, but the effective implementation of the class preprocessor (AspectWerkz layer 2) can be in standard system classpath (-cp).

Author:

Alexandre Vasseur

Constructor Summary

ClassPreProcessorHelper()

Method Summary

static byte[]	defineClass0Pre(ClassLoader caller, String name, byte[] b, int off, int len, ProtectionDomain pd) byte code instrumentation of class loaded
static Object	defineClass0Pre(ClassLoader caller, String name, Object byteBuffer, int off, int len, ProtectionDomain pd) Byte code instrumentation of class loaded using Java 5 style thru NIO Since Java 5 comes with JVMTI this helper should be rarely used.
static ClassPreProcessor	getClassPreProcessor() Returns the configured class preprocessor Should be called after initialization only
static void	initializePreProcessor() Initialization of the ClassPreProcessor The ClassPreProcessor implementation is lazy loaded.

Methods inherited from class java.lang.Object

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

Constructor Detail

ClassPreProcessorHelper

public ClassPreProcessorHelper()

Method Detail

getClassPreProcessor

public static ClassPreProcessor getClassPreProcessor()

Returns the configured class preprocessor Should be called after initialization only

Returns:

the preprocessor or null if not initialized

initializePreProcessor

public static void initializePreProcessor()

Initialization of the ClassPreProcessor The ClassPreProcessor implementation is lazy loaded. This allow to put it in the regular classpath whereas the instrumentation layer (layer 1) is in the bootclasspath

defineClass0Pre

public static byte[] defineClass0Pre(ClassLoader caller,
                                     String name,
                                     byte[] b,
                                     int off,
                                     int len,
                                     ProtectionDomain pd)

byte code instrumentation of class loaded

defineClass0Pre

public static Object defineClass0Pre(ClassLoader caller,
                                     String name,
                                     Object byteBuffer,
                                     int off,
                                     int len,
                                     ProtectionDomain pd)

Byte code instrumentation of class loaded using Java 5 style thru NIO Since Java 5 comes with JVMTI this helper should be rarely used. We do no reference ByteBuffer directly to allow Java 1.3 compilation, though this helper will be really slow

Parameters:

caller -

name -

byteBuffer - Object that is instance of Java 1.4 NIO ButeBuffer

off -

len -

pd -

Returns:

Object instance of Java 1.4 NIO ByteBuffer