/**************************************************************************************
* Copyright (c) Jonas Bon�r, Alexandre Vasseur. All rights reserved. *
* http://aspectwerkz.codehaus.org *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the LGPL license *
* a copy of which has been included with this distribution in the license.txt file. *
**************************************************************************************/
package org.codehaus.aspectwerkz.extension.jrockit;
import org.codehaus.aspectwerkz.hook.ClassPreProcessor;
import org.codehaus.aspectwerkz.compiler.VerifierClassLoader;
import com.bea.jvm.JVMFactory;
import java.net.URL;
import java.io.File;
/**
* JRockit (tested with 7SP4 and 8.1) preprocessor Adapter based on JMAPI
* <p/>
* JRockit has a low level API for hooking ClassPreProcessor, allowing the use of online weaving at full speed.
* Moreover, JRockit does not allow java.lang.ClassLoader overriding thru -Xbootclasspath/p option.
* <p/>
* The main difference with standard AspectWerkz online mode is that the ClassPreProcessor implementation and all third
* party jars CAN reside in the standard classpath.
* <p/>
* The command line tool will look like: <code>"%JAVA_COMMAND%" -Xmanagement:class=org.codehaus.aspectwerkz.extension.jrockit.JRockitPreProcessor
* -Xbootclasspath/p:"%ASPECTWERKZ_HOME%\target\extensions.jar;%ASPECTWERKZ_HOME%\lib\bcel-patch.jar;%ASPECTWERKZ_HOME%\lib\bcel.jar;%ASPECTWERKZ_HOME%\lib\aspectwerkz-core-%ASPECTWERKZ_VERSION%.jar;%ASPECTWERKZ_HOME%\lib\aspectwerkz-%ASPECTWERKZ_VERSION%.jar;%ASPECTWERKZ_LIBS%"
* -cp "%CP%;%ASPECTWERKZ_HOME%\lib\aspectwerkz-%ASPECTWERKZ_VERSION%.jar;%ASPECTWERKZ_LIBS%"
* -Daspectwerkz.home="%ASPECTWERKZ_HOME%" -Daspectwerkz.transform.verbose=yes %*</code> Note: there can be some
* NoClassDefFoundError due to classpath limitation - as described in http://edocs.bea.com/wls/docs81/adminguide/winservice.html
*
* @author <a href="mailto:alex@gnilux.com">Alexandre Vasseur</a>
*/
public class JRockitPreProcessor implements com.bea.jvm.ClassPreProcessor {
/**
* concrete preprocessor
*/
private static ClassPreProcessor preProcessor;
static {
String clpp = System.getProperty(
"aspectwerkz.classloader.preprocessor", "org.codehaus.aspectwerkz.transform.AspectWerkzPreProcessor"
);
try {
// note: CLPP loaded by current thread classloader which is bootstrap classloader
// caution: forcing loading thru Thread.setContextClassLoader() or ClassLoader.getSystemClassLoader()
// does not work. We then do a filtering on the caller classloader - see preProcess(..)
//preProcessor = (ClassPreProcessor) Class.forName(clpp).newInstance();
preProcessor = (ClassPreProcessor)ClassLoader.getSystemClassLoader().loadClass(clpp).newInstance();
preProcessor.initialize(null);
}
catch (Exception e) {
throw new ExceptionInInitializerError(e);
}
}
/**
* The JMAPI ClassPreProcessor must be self registrating
*/
public JRockitPreProcessor() {
JVMFactory.getJVM().getClassLibrary().setClassPreProcessor(this);
}
/**
* Weave a class
*
* @param caller classloader
* @param name of the class to weave
* @param bytecode original
* @return bytecode weaved
*/
public byte[] preProcess(ClassLoader caller, String name, byte[] bytecode) {
//System.out.println(name + " [" + caller + "]");
if (caller == null || caller.getParent() == null) {
return bytecode;
}
else {
return preProcessor.preProcess(name, bytecode, caller);
}
}
/**
* Utility for testing
*/
public static void main(String args[]) throws Throwable {
// uncomment this lines to programmaticaly configure at runtime the CLPP
JRockitPreProcessor pp = new JRockitPreProcessor();//self registration
Class loadedCP = Class.forName("java.math.BigDecimal");
System.out.println(org.codehaus.aspectwerkz.extension.jrockit.JRockitPreProcessor.class.getClassLoader());
while (true) {
System.out.print(".");
ClassLoader nonDelegatingCL = new VerifierClassLoader(
new URL[]{(new File(args[0])).toURL()}, ClassLoader.getSystemClassLoader()
);
Class loaded = nonDelegatingCL.loadClass(
org.codehaus.aspectwerkz.extension.jrockit.JRockitPreProcessor.class.getName()
);
Thread.sleep(500);
}
}
}