/*******************************************************************************
* Copyright (c) 2006 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Matthew Webster - initial implementation
*******************************************************************************/
package org.aspectj.weaver.loadtime;
import java.util.Stack;
import com.bea.jvm.ClassLibrary;
import com.bea.jvm.JVMFactory;
/**
* BEA JRocket JMAPI agent.
*
* Use "-Xmanagement:class=org.aspectj.weaver.loadtime.JRockitAgent"
*/
public class JRockitAgent implements com.bea.jvm.ClassPreProcessor {
private ClassPreProcessor preProcessor;
/*
* This is used to implement the recursion protection offered by JVMTI but not by JRockit JMAPI. I we are called to preProcess a
* class while already preProcessing another we will return immediately
*/
private static ThreadLocalStack stack = new ThreadLocalStack();
public JRockitAgent() {
this.preProcessor = new Aj();
ClassLibrary cl = JVMFactory.getJVM().getClassLibrary();
cl.setClassPreProcessor(this);
}
public byte[] preProcess(ClassLoader loader, String className, byte[] bytes) {
byte[] newBytes = bytes;
if (stack.empty()) {
stack.push(className);
newBytes = preProcessor.preProcess(className, bytes, loader, null);
stack.pop();
}
return newBytes;
}
private static class ThreadLocalStack extends ThreadLocal {
public boolean empty() {
Stack stack = (Stack) get();
return stack.empty();
}
public Object peek() {
Object obj = null;
Stack stack = (Stack) get();
if (!stack.empty())
obj = stack.peek();
return obj;
}
public void push(Object obj) {
Stack stack = (Stack) get();
if (!stack.empty() && obj == stack.peek())
throw new RuntimeException(obj.toString());
stack.push(obj);
}
public Object pop() {
Stack stack = (Stack) get();
return stack.pop();
}
protected Object initialValue() {
return new Stack();
}
}
}