rlm@10: /**
rlm@10:  *   Copyright (c) Rich Hickey. All rights reserved.
rlm@10:  *   The use and distribution terms for this software are covered by the
rlm@10:  *   Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
rlm@10:  *   which can be found in the file epl-v10.html at the root of this distribution.
rlm@10:  *   By using this software in any fashion, you are agreeing to be bound by
rlm@10:  * 	 the terms of this license.
rlm@10:  *   You must not remove this notice, or any other, from this software.
rlm@10:  **/
rlm@10: 
rlm@10: /* rich Aug 21, 2007 */
rlm@10: 
rlm@10: package clojure.lang;
rlm@10: 
rlm@10: import java.util.HashMap;
rlm@10: import java.util.Map;
rlm@10: import java.util.concurrent.ConcurrentHashMap;
rlm@10: import java.net.URLClassLoader;
rlm@10: import java.net.URL;
rlm@10: import java.lang.ref.ReferenceQueue;
rlm@10: import java.lang.ref.SoftReference;
rlm@10: 
rlm@10: public class DynamicClassLoader extends URLClassLoader{
rlm@10: HashMap<Integer, Object[]> constantVals = new HashMap<Integer, Object[]>();
rlm@10: static ConcurrentHashMap<String, SoftReference<Class>>classCache =
rlm@10:         new ConcurrentHashMap<String, SoftReference<Class> >();
rlm@10: 
rlm@10: static final URL[] EMPTY_URLS = new URL[]{};
rlm@10: 
rlm@10: static final ReferenceQueue rq = new ReferenceQueue();
rlm@10: 
rlm@10: public DynamicClassLoader(){
rlm@10:     //pseudo test in lieu of hasContextClassLoader()
rlm@10: 	super(EMPTY_URLS,(Thread.currentThread().getContextClassLoader() == null ||
rlm@10:                 Thread.currentThread().getContextClassLoader() == ClassLoader.getSystemClassLoader())?
rlm@10:                 Compiler.class.getClassLoader():Thread.currentThread().getContextClassLoader());
rlm@10: }
rlm@10: 
rlm@10: public DynamicClassLoader(ClassLoader parent){
rlm@10: 	super(EMPTY_URLS,parent);
rlm@10: }
rlm@10: 
rlm@10: public Class defineClass(String name, byte[] bytes, Object srcForm){
rlm@10: 	Util.clearCache(rq, classCache);
rlm@10: 	Class c = defineClass(name, bytes, 0, bytes.length);
rlm@10:     classCache.put(name, new SoftReference(c,rq));
rlm@10:     return c;
rlm@10: }
rlm@10: 
rlm@10: protected Class<?> findClass(String name) throws ClassNotFoundException{
rlm@10:     SoftReference<Class> cr = classCache.get(name);
rlm@10: 	if(cr != null)
rlm@10: 		{
rlm@10: 		Class c = cr.get();
rlm@10:         if(c != null)
rlm@10:             return c;
rlm@10: 		}
rlm@10: 	return super.findClass(name);
rlm@10: }
rlm@10: 
rlm@10: public void registerConstants(int id, Object[] val){
rlm@10: 	constantVals.put(id, val);
rlm@10: }
rlm@10: 
rlm@10: public Object[] getConstants(int id){
rlm@10: 	return constantVals.get(id);
rlm@10: }
rlm@10: 
rlm@10: public void addURL(URL url){
rlm@10: 	super.addURL(url);
rlm@10: }
rlm@10: 
rlm@10: }