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/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. Alternatively, the contents of this file may be used under
* the terms of the GNU Lesser General Public License Version 2.1 or later,
* or the Apache License Version 2.0.
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*/
package scouter.javassist.scopedpool;
import java.lang.ref.WeakReference;
import java.security.ProtectionDomain;
import java.util.Iterator;
import java.util.Map;
import scouter.javassist.CannotCompileException;
import scouter.javassist.ClassPool;
import scouter.javassist.CtClass;
import scouter.javassist.LoaderClassPath;
import scouter.javassist.NotFoundException;
import scouter.javassist.scopedpool.ScopedClassPoolRepository;
import scouter.javassist.scopedpool.SoftValueHashMap;
/**
* A scoped class pool.
*
* @author Bill Burke
* @author Adrian Brock
* @author Kabir Khan
* @version $Revision: 1.8 $
*/
public class ScopedClassPool extends ClassPool {
protected ScopedClassPoolRepository repository;
protected WeakReference classLoader;
protected LoaderClassPath classPath;
protected SoftValueHashMap softcache = new SoftValueHashMap();
boolean isBootstrapCl = true;
static {
ClassPool.doPruning = false;
ClassPool.releaseUnmodifiedClassFile = false;
}
/**
* Create a new ScopedClassPool.
*
* @param cl
* the classloader
* @param src
* the original class pool
* @param repository
* the repository
*@deprecated
*/
protected ScopedClassPool(ClassLoader cl, ClassPool src,
ScopedClassPoolRepository repository) {
this(cl, src, repository, false);
}
/**
* Create a new ScopedClassPool.
*
* @param cl
* the classloader
* @param src
* the original class pool
* @param repository
* the repository
* @param isTemp
* Whether this is a temporary pool used to resolve references
*/
protected ScopedClassPool(ClassLoader cl, ClassPool src, ScopedClassPoolRepository repository, boolean isTemp)
{
super(src);
this.repository = repository;
this.classLoader = new WeakReference(cl);
if (cl != null) {
classPath = new LoaderClassPath(cl);
this.insertClassPath(classPath);
}
childFirstLookup = true;
if (!isTemp && cl == null)
{
isBootstrapCl = true;
}
}
/**
* Get the class loader
*
* @return the class loader
*/
public ClassLoader getClassLoader() {
ClassLoader cl = getClassLoader0();
if (cl == null && !isBootstrapCl)
{
throw new IllegalStateException(
"ClassLoader has been garbage collected");
}
return cl;
}
protected ClassLoader getClassLoader0() {
return (ClassLoader)classLoader.get();
}
/**
* Close the class pool
*/
public void close() {
this.removeClassPath(classPath);
classPath.close();
classes.clear();
softcache.clear();
}
/**
* Flush a class
*
* @param classname
* the class to flush
*/
public synchronized void flushClass(String classname) {
classes.remove(classname);
softcache.remove(classname);
}
/**
* Soften a class
*
* @param clazz
* the class
*/
public synchronized void soften(CtClass clazz) {
if (repository.isPrune())
clazz.prune();
classes.remove(clazz.getName());
softcache.put(clazz.getName(), clazz);
}
/**
* Whether the classloader is loader
*
* @return false always
*/
public boolean isUnloadedClassLoader() {
return false;
}
/**
* Get the cached class
*
* @param classname
* the class name
* @return the class
*/
protected CtClass getCached(String classname) {
CtClass clazz = getCachedLocally(classname);
if (clazz == null) {
boolean isLocal = false;
ClassLoader dcl = getClassLoader0();
if (dcl != null) {
final int lastIndex = classname.lastIndexOf('$');
String classResourceName = null;
if (lastIndex < 0) {
classResourceName = classname.replaceAll("[\\.]", "/")
+ ".class";
}
else {
classResourceName = classname.substring(0, lastIndex)
.replaceAll("[\\.]", "/")
+ classname.substring(lastIndex) + ".class";
}
isLocal = dcl.getResource(classResourceName) != null;
}
if (!isLocal) {
Map registeredCLs = repository.getRegisteredCLs();
synchronized (registeredCLs) {
Iterator it = registeredCLs.values().iterator();
while (it.hasNext()) {
ScopedClassPool pool = (ScopedClassPool)it.next();
if (pool.isUnloadedClassLoader()) {
repository.unregisterClassLoader(pool
.getClassLoader());
continue;
}
clazz = pool.getCachedLocally(classname);
if (clazz != null) {
return clazz;
}
}
}
}
}
// *NOTE* NEED TO TEST WHEN SUPERCLASS IS IN ANOTHER UCL!!!!!!
return clazz;
}
/**
* Cache a class
*
* @param classname
* the class name
* @param c
* the ctClass
* @param dynamic
* whether the class is dynamically generated
*/
protected void cacheCtClass(String classname, CtClass c, boolean dynamic) {
if (dynamic) {
super.cacheCtClass(classname, c, dynamic);
}
else {
if (repository.isPrune())
c.prune();
softcache.put(classname, c);
}
}
/**
* Lock a class into the cache
*
* @param c
* the class
*/
public void lockInCache(CtClass c) {
super.cacheCtClass(c.getName(), c, false);
}
/**
* Whether the class is cached in this pooled
*
* @param classname
* the class name
* @return the cached class
*/
protected CtClass getCachedLocally(String classname) {
CtClass cached = (CtClass)classes.get(classname);
if (cached != null)
return cached;
synchronized (softcache) {
return (CtClass)softcache.get(classname);
}
}
/**
* Get any local copy of the class
*
* @param classname
* the class name
* @return the class
* @throws NotFoundException
* when the class is not found
*/
public synchronized CtClass getLocally(String classname)
throws NotFoundException {
softcache.remove(classname);
CtClass clazz = (CtClass)classes.get(classname);
if (clazz == null) {
clazz = createCtClass(classname, true);
if (clazz == null)
throw new NotFoundException(classname);
super.cacheCtClass(classname, clazz, false);
}
return clazz;
}
/**
* Convert a javassist class to a java class
*
* @param ct
* the javassist class
* @param loader
* the loader
* @throws CannotCompileException
* for any error
*/
public Class toClass(CtClass ct, ClassLoader loader, ProtectionDomain domain)
throws CannotCompileException {
// We need to pass up the classloader stored in this pool, as the
// default implementation uses the Thread context cl.
// In the case of JSP's in Tomcat,
// org.apache.jasper.servlet.JasperLoader will be stored here, while
// it's parent
// org.jboss.web.tomcat.tc5.WebCtxLoader$ENCLoader is used as the Thread
// context cl. The invocation class needs to
// be generated in the JasperLoader classloader since in the case of
// method invocations, the package name will be
// the same as for the class generated from the jsp, i.e.
// org.apache.jsp. For classes belonging to org.apache.jsp,
// JasperLoader does NOT delegate to its parent if it cannot find them.
lockInCache(ct);
return super.toClass(ct, getClassLoader0(), domain);
}
}
