Mercurial > lasercutter
comparison src/clojure/lang/DynamicClassLoader.java @ 10:ef7dbbd6452c
added clojure source goodness
author | Robert McIntyre <rlm@mit.edu> |
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date | Sat, 21 Aug 2010 06:25:44 -0400 |
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9:35cf337adfcf | 10:ef7dbbd6452c |
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1 /** | |
2 * Copyright (c) Rich Hickey. All rights reserved. | |
3 * The use and distribution terms for this software are covered by the | |
4 * Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php) | |
5 * which can be found in the file epl-v10.html at the root of this distribution. | |
6 * By using this software in any fashion, you are agreeing to be bound by | |
7 * the terms of this license. | |
8 * You must not remove this notice, or any other, from this software. | |
9 **/ | |
10 | |
11 /* rich Aug 21, 2007 */ | |
12 | |
13 package clojure.lang; | |
14 | |
15 import java.util.HashMap; | |
16 import java.util.Map; | |
17 import java.util.concurrent.ConcurrentHashMap; | |
18 import java.net.URLClassLoader; | |
19 import java.net.URL; | |
20 import java.lang.ref.ReferenceQueue; | |
21 import java.lang.ref.SoftReference; | |
22 | |
23 public class DynamicClassLoader extends URLClassLoader{ | |
24 HashMap<Integer, Object[]> constantVals = new HashMap<Integer, Object[]>(); | |
25 static ConcurrentHashMap<String, SoftReference<Class>>classCache = | |
26 new ConcurrentHashMap<String, SoftReference<Class> >(); | |
27 | |
28 static final URL[] EMPTY_URLS = new URL[]{}; | |
29 | |
30 static final ReferenceQueue rq = new ReferenceQueue(); | |
31 | |
32 public DynamicClassLoader(){ | |
33 //pseudo test in lieu of hasContextClassLoader() | |
34 super(EMPTY_URLS,(Thread.currentThread().getContextClassLoader() == null || | |
35 Thread.currentThread().getContextClassLoader() == ClassLoader.getSystemClassLoader())? | |
36 Compiler.class.getClassLoader():Thread.currentThread().getContextClassLoader()); | |
37 } | |
38 | |
39 public DynamicClassLoader(ClassLoader parent){ | |
40 super(EMPTY_URLS,parent); | |
41 } | |
42 | |
43 public Class defineClass(String name, byte[] bytes, Object srcForm){ | |
44 Util.clearCache(rq, classCache); | |
45 Class c = defineClass(name, bytes, 0, bytes.length); | |
46 classCache.put(name, new SoftReference(c,rq)); | |
47 return c; | |
48 } | |
49 | |
50 protected Class<?> findClass(String name) throws ClassNotFoundException{ | |
51 SoftReference<Class> cr = classCache.get(name); | |
52 if(cr != null) | |
53 { | |
54 Class c = cr.get(); | |
55 if(c != null) | |
56 return c; | |
57 } | |
58 return super.findClass(name); | |
59 } | |
60 | |
61 public void registerConstants(int id, Object[] val){ | |
62 constantVals.put(id, val); | |
63 } | |
64 | |
65 public Object[] getConstants(int id){ | |
66 return constantVals.get(id); | |
67 } | |
68 | |
69 public void addURL(URL url){ | |
70 super.addURL(url); | |
71 } | |
72 | |
73 } |