1 package org.apache.maven.surefire.booter;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import java.net.URL;
23 import java.net.URLClassLoader;
24 import java.util.HashSet;
25 import java.util.Set;
26
27 /**
28 * Loads classes from jar files added via {@link #addURL(URL)}.
29 */
30 public class IsolatedClassLoader
31 extends URLClassLoader
32 {
33 private final ClassLoader parent = ClassLoader.getSystemClassLoader();
34
35 private final Set<URL> urls = new HashSet<>();
36
37 private final String roleName;
38
39 private boolean childDelegation = true;
40
41 private static final URL[] EMPTY_URL_ARRAY = new URL[0];
42
43 public IsolatedClassLoader( ClassLoader parent, boolean childDelegation, String roleName )
44 {
45 super( EMPTY_URL_ARRAY, parent );
46
47 this.childDelegation = childDelegation;
48
49 this.roleName = roleName;
50 }
51
52 /**
53 * @deprecated this method will use {@link java.io.File} instead of {@link URL} in the next
54 * major version.
55 */
56 @Override
57 @Deprecated
58 public void addURL( URL url )
59 {
60 // avoid duplicates
61 // todo avoid URL due to calling equals method may cause some overhead due to resolving host or file.
62 if ( !urls.contains( url ) )
63 {
64 super.addURL( url );
65 urls.add( url );
66 }
67 }
68
69 @Override
70 public synchronized Class loadClass( String name )
71 throws ClassNotFoundException
72 {
73 if ( childDelegation )
74 {
75 Class<?> c = findLoadedClass( name );
76
77 if ( c == null )
78 {
79 try
80 {
81 c = findClass( name );
82 }
83 catch ( ClassNotFoundException e )
84 {
85 if ( parent == null )
86 {
87 throw e;
88 }
89 else
90 {
91 c = parent.loadClass( name );
92 }
93 }
94 }
95
96 return c;
97 }
98 else
99 {
100 return super.loadClass( name );
101 }
102 }
103
104 @Override
105 public String toString()
106 {
107 return "IsolatedClassLoader{roleName='" + roleName + "'}";
108 }
109 }