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1 /**
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2 * Copyright (c) Rich Hickey. All rights reserved.
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3 * The use and distribution terms for this software are covered by the
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4 * Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
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5 * which can be found in the file epl-v10.html at the root of this distribution.
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6 * By using this software in any fashion, you are agreeing to be bound by
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7 * the terms of this license.
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8 * You must not remove this notice, or any other, from this software.
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9 **/
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10
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11 /* rich Aug 21, 2007 */
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12
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13 package clojure.lang;
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14
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15 import java.util.HashMap;
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16 import java.util.Map;
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17 import java.util.concurrent.ConcurrentHashMap;
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18 import java.net.URLClassLoader;
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19 import java.net.URL;
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20 import java.lang.ref.ReferenceQueue;
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21 import java.lang.ref.SoftReference;
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22
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23 public class DynamicClassLoader extends URLClassLoader{
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24 HashMap<Integer, Object[]> constantVals = new HashMap<Integer, Object[]>();
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25 static ConcurrentHashMap<String, SoftReference<Class>>classCache =
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26 new ConcurrentHashMap<String, SoftReference<Class> >();
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27
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28 static final URL[] EMPTY_URLS = new URL[]{};
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29
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30 static final ReferenceQueue rq = new ReferenceQueue();
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31
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32 public DynamicClassLoader(){
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33 //pseudo test in lieu of hasContextClassLoader()
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34 super(EMPTY_URLS,(Thread.currentThread().getContextClassLoader() == null ||
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35 Thread.currentThread().getContextClassLoader() == ClassLoader.getSystemClassLoader())?
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36 Compiler.class.getClassLoader():Thread.currentThread().getContextClassLoader());
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37 }
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38
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39 public DynamicClassLoader(ClassLoader parent){
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40 super(EMPTY_URLS,parent);
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41 }
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42
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43 public Class defineClass(String name, byte[] bytes, Object srcForm){
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44 Util.clearCache(rq, classCache);
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45 Class c = defineClass(name, bytes, 0, bytes.length);
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46 classCache.put(name, new SoftReference(c,rq));
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47 return c;
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48 }
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49
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50 protected Class<?> findClass(String name) throws ClassNotFoundException{
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51 SoftReference<Class> cr = classCache.get(name);
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52 if(cr != null)
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53 {
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54 Class c = cr.get();
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55 if(c != null)
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56 return c;
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57 }
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58 return super.findClass(name);
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59 }
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60
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61 public void registerConstants(int id, Object[] val){
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62 constantVals.put(id, val);
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63 }
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64
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65 public Object[] getConstants(int id){
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66 return constantVals.get(id);
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67 }
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68
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69 public void addURL(URL url){
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70 super.addURL(url);
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71 }
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72
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73 }
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