1 /*
2 * JBoss, Home of Professional Open Source
3 * Copyright 2005, JBoss Inc., and individual contributors as indicated
4 * by the @authors tag. See the copyright.txt in the distribution for a
5 * full listing of individual contributors.
6 *
7 * This is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU Lesser General Public License as
9 * published by the Free Software Foundation; either version 2.1 of
10 * the License, or (at your option) any later version.
11 *
12 * This software is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this software; if not, write to the Free
19 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21 */
22 package org.jboss.mx.loading;
23
24 import java.net.URL;
25
26 /** An extension of UnifiedClassLoader that manages a thread based loading
27 * strategy to work around the locking problems associated with the VM
28 * initiated locking due to the synchronized loadClassInternal method of
29 * ClassLoader which cannot be overriden.
30
31 * @author <a href="scott.stark@jboss.org">Scott Stark</a>
32 * @version $Revision: 37459 $
33 */
34 public class UnifiedClassLoader3 extends UnifiedClassLoader
35 implements UnifiedClassLoader3MBean
36 {
37 // Static --------------------------------------------------------
38
39 // Attributes ----------------------------------------------------
40
41 // Constructors --------------------------------------------------
42 /**
43 * Construct a <tt>UnifiedClassLoader</tt> without registering it to the
44 * classloader repository.
45 *
46 * @param url the single URL to load classes from.
47 */
48 public UnifiedClassLoader3(URL url)
49 {
50 this(url, null);
51 }
52 /**
53 * Construct a <tt>UnifiedClassLoader</tt> without registering it to the
54 * classloader repository.
55 *
56 * @param url the single URL to load classes from.
57 * @param origURL the possibly null original URL from which url may
58 * be a local copy or nested jar.
59 */
60 public UnifiedClassLoader3(URL url, URL origURL)
61 {
62 super(url, origURL);
63 }
64
65 /** Construct a UnifiedClassLoader and associate it with the given
66 * repository.
67 * @param url The single URL to load classes from.
68 * @param origURL the possibly null original URL from which url may
69 * be a local copy or nested jar.
70 * @param repository the repository this classloader delegates to
71 */
72 public UnifiedClassLoader3(URL url, URL origURL, LoaderRepository repository)
73 {
74 this(url, origURL);
75
76 // set the repository reference
77 this.setRepository(repository);
78 }
79 /** Construct a UnifiedClassLoader and associate it with the given
80 * repository.
81 * @param url The single URL to load classes from.
82 * @param origURL the possibly null original URL from which url may
83 * be a local copy or nested jar.
84 * @param parent the parent class loader to use
85 * @param repository the repository this classloader delegates to
86 */
87 public UnifiedClassLoader3(URL url, URL origURL, ClassLoader parent,
88 LoaderRepository repository)
89 {
90 super(url, origURL, parent);
91
92 // set the repository reference
93 this.setRepository(repository);
94 }
95
96 // Public --------------------------------------------------------
97
98 /**
99 * Retruns a string representaion of this UCL.
100 */
101 public String toString()
102 {
103 StringBuffer tmp = new StringBuffer(super.toString());
104 tmp.setCharAt(tmp.length()-1, ',');
105 tmp.append("addedOrder=");
106 tmp.append(getAddedOrder());
107 tmp.append('}');
108 return tmp.toString();
109 }
110 }
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