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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 javassist.scopedpool;
-
- import java.lang.ref.Reference;
- import java.lang.ref.WeakReference;
- import java.security.ProtectionDomain;
- import java.util.Map;
- import javassist.CannotCompileException;
- import javassist.ClassPool;
- import javassist.CtClass;
- import javassist.LoaderClassPath;
- import javassist.NotFoundException;
-
- /**
- * A scoped class pool.
- *
- * @author <a href="mailto:bill@jboss.org">Bill Burke</a>
- * @author <a href="adrian@jboss.com">Adrian Brock</a>
- * @author <a href="kabir.khan@jboss.com">Kabir Khan</a>
- * @version $Revision: 1.8 $
- */
- public class ScopedClassPool extends ClassPool {
- protected ScopedClassPoolRepository repository;
-
- protected Reference<ClassLoader> classLoader;
-
- protected LoaderClassPath classPath;
-
- protected Map<String,CtClass> softcache = new SoftValueHashMap<String,CtClass>();
-
- 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
- */
- 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<ClassLoader>(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.get();
- }
-
- /**
- * Close the class pool
- */
- public void close() {
- this.removeClassPath(classPath);
- 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
- */
- @Override
- 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<ClassLoader,ScopedClassPool> registeredCLs = repository.getRegisteredCLs();
- synchronized (registeredCLs) {
- for (ScopedClassPool pool:registeredCLs.values()) {
- 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);
- }
- }
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