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The AspectJ weaver introduces advices to java classes
/* *******************************************************************
* Copyright (c) 2005-2017 Contributors.
* 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://eclipse.org/legal/epl-v10.html
* ******************************************************************/
package org.aspectj.weaver.reflect;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import org.aspectj.bridge.AbortException;
import org.aspectj.bridge.IMessage;
import org.aspectj.bridge.IMessageHandler;
import org.aspectj.util.LangUtil;
import org.aspectj.weaver.BCException;
import org.aspectj.weaver.IWeavingSupport;
import org.aspectj.weaver.ReferenceType;
import org.aspectj.weaver.ReferenceTypeDelegate;
import org.aspectj.weaver.ResolvedType;
import org.aspectj.weaver.UnresolvedType;
import org.aspectj.weaver.WeakClassLoaderReference;
import org.aspectj.weaver.World;
/**
* A ReflectionWorld is used solely for purposes of type resolution based on the runtime classpath (java.lang.reflect). It does not
* support weaving operations (creation of mungers etc..).
*
* @author Adrian Colyer
* @author Andy Clement
*/
public class ReflectionWorld extends World implements IReflectionWorld {
private static Map rworlds = Collections.synchronizedMap(new HashMap());
private WeakClassLoaderReference classLoaderReference;
private AnnotationFinder annotationFinder;
private boolean mustUseOneFourDelegates = false; // for testing
private Map> inProgressResolutionClasses = new HashMap>();
public static ReflectionWorld getReflectionWorldFor(WeakClassLoaderReference classLoaderReference) {
// Temporarily do as before. Although the cache makes things faster it needs a bit more thought because
// if the world has pointcutdesignators registered then someone may inadvertently register additional
// ones on reusing a world (when they would be expecting a clean world). We can't automatically
// clear them because we don't know when they are finished with.
return new ReflectionWorld(classLoaderReference);
/*
synchronized (rworlds) {
// Tidyup any no longer relevant entries...
for (Iterator> it = rworlds.entrySet().iterator();
it.hasNext();) {
Map.Entry entry = it.next();
if (entry.getKey().getClassLoader() == null) {
it.remove();
}
}
ReflectionWorld rworld = null;
if (classLoaderReference.getClassLoader() != null) {
rworld = rworlds.get(classLoaderReference);
if (rworld == null) {
rworld = new ReflectionWorld(classLoaderReference);
rworlds.put(classLoaderReference, rworld);
}
}
return rworld;
}
*/
}
public static void cleanUpWorlds() {
synchronized (rworlds) {
rworlds.clear();
}
}
private ReflectionWorld() {
// super();
// this.setMessageHandler(new ExceptionBasedMessageHandler());
// setBehaveInJava5Way(LangUtil.is15VMOrGreater());
// this.classLoaderReference = new
// WeakClassLoaderReference(ReflectionWorld.class.getClassLoader());
// this.annotationFinder =
// makeAnnotationFinderIfAny(classLoaderReference.getClassLoader(),
// this);
}
public ReflectionWorld(WeakClassLoaderReference classloaderRef) {
this.setMessageHandler(new ExceptionBasedMessageHandler());
setBehaveInJava5Way(LangUtil.is15VMOrGreater());
classLoaderReference = classloaderRef;
annotationFinder = makeAnnotationFinderIfAny(classLoaderReference.getClassLoader(), this);
}
public ReflectionWorld(ClassLoader aClassLoader) {
super();
this.setMessageHandler(new ExceptionBasedMessageHandler());
setBehaveInJava5Way(LangUtil.is15VMOrGreater());
classLoaderReference = new WeakClassLoaderReference(aClassLoader);
annotationFinder = makeAnnotationFinderIfAny(classLoaderReference.getClassLoader(), this);
}
public ReflectionWorld(boolean forceUseOf14Delegates, ClassLoader aClassLoader) {
this(aClassLoader);
this.mustUseOneFourDelegates = forceUseOf14Delegates;
if (forceUseOf14Delegates) {
// Dont use 1.4 delegates and yet allow autoboxing
this.setBehaveInJava5Way(false);
}
}
public static AnnotationFinder makeAnnotationFinderIfAny(ClassLoader loader, World world) {
AnnotationFinder annotationFinder = null;
try {
if (LangUtil.is15VMOrGreater()) {
Class java15AnnotationFinder = Class.forName("org.aspectj.weaver.reflect.Java15AnnotationFinder");
annotationFinder = (AnnotationFinder) java15AnnotationFinder.newInstance();
annotationFinder.setClassLoader(loader);
annotationFinder.setWorld(world);
}
} catch (ClassNotFoundException ex) {
// must be on 1.4 or earlier
} catch (IllegalAccessException ex) {
// not so good
throw new BCException("AspectJ internal error", ex);
} catch (InstantiationException ex) {
throw new BCException("AspectJ internal error", ex);
}
return annotationFinder;
}
public ClassLoader getClassLoader() {
return classLoaderReference.getClassLoader();
}
public AnnotationFinder getAnnotationFinder() {
return annotationFinder;
}
public ResolvedType resolve(Class aClass) {
return resolve(this, aClass);
}
public static ResolvedType resolve(World world, Class aClass) {
// classes that represent arrays return a class name that is the
// signature of the array type, ho-hum...
String className = aClass.getName();
if (aClass.isArray()) {
return world.resolve(UnresolvedType.forSignature(className.replace('.', '/')));
} else {
return world.resolve(className);
}
}
/**
* Resolve a type using the specified class. Normal resolution in a reflection
* world uses Class.forName() via the classloader (attached to this world)
* in order to find a named type then builds a reference type and a reference
* type delegate based on that. For some classes generated at runtime (e.g.
* proxy or lambda representation) the forName() call will not work. In those
* situations we should just use the clazz we have.
*
* Should the whole thing switch from using forName() to using the clazz objects?
* Possibly but that introduces a lot of change and we don't have a lot
* of test coverage for this scenario (reflection world). What we are doing
* right now is that this can optionally be used if the regular resolution
* scheme did not work.
*
* Although AspectJ is *not* multi threaded or re-entrant, Spring doesn't
* always respect that. There might be an issue here if two attempts are
* made to resolve the same thing at the same time via this method.
*
* @param clazz the class to use as the delegate for the resolved type
*/
public ResolvedType resolveUsingClass(Class clazz) {
String signature = UnresolvedType.forName(clazz.getName()).getSignature();
try {
inProgressResolutionClasses.put(signature, clazz);
return resolve(clazz.getName());
} finally {
inProgressResolutionClasses.remove(signature);
}
}
protected ReferenceTypeDelegate resolveDelegate(ReferenceType ty) {
ReferenceTypeDelegate result;
if (mustUseOneFourDelegates) {
result = ReflectionBasedReferenceTypeDelegateFactory.create14Delegate(ty, this, classLoaderReference.getClassLoader());
} else {
result = ReflectionBasedReferenceTypeDelegateFactory.createDelegate(ty, this, classLoaderReference.getClassLoader());
}
if (result == null && inProgressResolutionClasses.size() != 0) {
// Is it a class that cannot be loaded (i.e. it was generated) but we already know about?
Class clazz = inProgressResolutionClasses.get(ty.getSignature());
if (clazz != null) {
result = ReflectionBasedReferenceTypeDelegateFactory.createDelegate(ty,this,clazz);
}
}
return result;
}
public static class ReflectionWorldException extends RuntimeException {
private static final long serialVersionUID = -3432261918302793005L;
public ReflectionWorldException(String message) {
super(message);
}
}
private static class ExceptionBasedMessageHandler implements IMessageHandler {
public boolean handleMessage(IMessage message) throws AbortException {
throw new ReflectionWorldException(message.toString());
}
public boolean isIgnoring(org.aspectj.bridge.IMessage.Kind kind) {
if (kind == IMessage.INFO) {
return true;
} else {
return false;
}
}
public void dontIgnore(org.aspectj.bridge.IMessage.Kind kind) {
// empty
}
public void ignore(org.aspectj.bridge.IMessage.Kind kind) {
// empty
}
}
public IWeavingSupport getWeavingSupport() {
return null;
}
public boolean isLoadtimeWeaving() {
return true;
}
}