Source Code Cross Referenced for BasicLoaderRepository.java in  » EJB-Server-JBoss-4.2.1 » jmx » org » jboss » mx » loading » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server JBoss 4.2.1 » jmx » org.jboss.mx.loading 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * JBoss, Home of Professional Open Source.
003:         * Copyright 2006, Red Hat Middleware LLC, and individual contributors
004:         * as indicated by the @author tags. See the copyright.txt file in the
005:         * distribution for a full listing of individual contributors.
006:         *
007:         * This is free software; you can redistribute it and/or modify it
008:         * under the terms of the GNU Lesser General Public License as
009:         * published by the Free Software Foundation; either version 2.1 of
010:         * the License, or (at your option) any later version.
011:         *
012:         * This software is distributed in the hope that it will be useful,
013:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
014:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015:         * Lesser General Public License for more details.
016:         *
017:         * You should have received a copy of the GNU Lesser General Public
018:         * License along with this software; if not, write to the Free
019:         * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
021:         */
022:        package org.jboss.mx.loading;
023:
024:        import java.net.URL;
025:        import java.util.Enumeration;
026:        import java.util.Iterator;
027:        import java.util.List;
028:
029:        /**
030:         * Implements a simple classloader repository for the MBean server. The basic
031:         * loader repository uses an unordered list of classloaders to try and load
032:         * the required class. There is no attempt made to resolve conflicts between
033:         * classes loaded by different classloaders. <p>
034:         *
035:         * A thread's context class loader is always searched first. Context class loader
036:         * is not required to be registered to the repository.
037:         *
038:         * @see org.jboss.mx.loading.LoaderRepository
039:         *
040:         * @author  <a href="mailto:juha@jboss.org">Juha Lindfors</a>.
041:         * @version $Revision: 57200 $
042:         */
043:        public class BasicLoaderRepository extends LoaderRepository {
044:
045:            // Public --------------------------------------------------------
046:
047:            /**
048:             * Loads a class from the repository. This method attempts to load the class
049:             * using all the classloader registered to the repository.
050:             *
051:             * @param className the class to load
052:             * @return the found class
053:             * @exception ClassNotFoundException when there is no such class
054:             */
055:            public Class loadClass(String className)
056:                    throws ClassNotFoundException {
057:                return loadClassWithout(null, className);
058:            }
059:
060:            /**
061:             * Loads a class from the repository, excluding the given
062:             * classloader.
063:             *
064:             * @param skipLoader the classloader to exclude
065:             * @param className the class to load
066:             * @return the found class
067:             * @exception ClassNotFoundException when there is no such class
068:             */
069:            public Class loadClassWithout(ClassLoader skipLoader,
070:                    String className) throws ClassNotFoundException {
071:                // try ctx cl first
072:                ClassLoader ctxLoader = Thread.currentThread()
073:                        .getContextClassLoader();
074:                if (ctxLoader != skipLoader) {
075:                    try {
076:                        return ctxLoader.loadClass(className);
077:                    } catch (ClassNotFoundException e) {
078:                        // ignore and move on to the loader list
079:                    }
080:                }
081:
082:                Iterator it = loaders.iterator();
083:                while (it.hasNext()) {
084:                    ClassLoader cl = (ClassLoader) it.next();
085:                    if (cl != skipLoader) {
086:                        try {
087:                            return cl.loadClass(className);
088:                        } catch (ClassNotFoundException ignored) {
089:                            // go on and try the next loader
090:                        }
091:                    }
092:                }
093:
094:                // at last try a native
095:                Class clazz = getNativeClassForName(className);
096:                if (clazz != null)
097:                    return clazz;
098:
099:                throw new ClassNotFoundException(className);
100:            }
101:
102:            /**
103:             * Loads a class from the repository, using the classloaders that were
104:             * registered before the given classloader.
105:             *
106:             * @param   stop      consult all the classloaders registered before this one
107:             *                    in an attempt to load a class
108:             * @param   className name of the class to load
109:             *
110:             * @return  loaded class instance
111:             *
112:             * @throws ClassNotFoundException if none of the consulted classloaders were
113:             *         able to load the requested class
114:             */
115:            public Class loadClassBefore(ClassLoader stop, String className)
116:                    throws ClassNotFoundException {
117:                Iterator it = loaders.iterator();
118:                while (it.hasNext()) {
119:                    ClassLoader cl = (ClassLoader) it.next();
120:                    if (cl == stop)
121:                        break;
122:
123:                    try {
124:                        return cl.loadClass(className);
125:                    } catch (ClassNotFoundException ignored) {
126:                        // go on and try the next loader
127:                    }
128:                }
129:
130:                // at last try a native
131:                Class clazz = getNativeClassForName(className);
132:                if (clazz != null)
133:                    return clazz;
134:
135:                throw new ClassNotFoundException(className);
136:            }
137:
138:            public void addClassLoader(ClassLoader cl) {
139:                loaders.add(cl);
140:            }
141:
142:            public boolean addClassLoaderURL(ClassLoader cl, URL url) {
143:                // This is a noop here
144:                return false;
145:            }
146:
147:            public void removeClassLoader(ClassLoader cl) {
148:                loaders.remove(cl);
149:            }
150:
151:            public RepositoryClassLoader newClassLoader(final URL url,
152:                    boolean addToRepository) throws Exception {
153:                UnifiedClassLoader ucl = new UnifiedClassLoader(url);
154:                if (addToRepository)
155:                    this .addClassLoader(ucl);
156:                return ucl;
157:            }
158:
159:            public RepositoryClassLoader newClassLoader(final URL url,
160:                    final URL origURL, boolean addToRepository)
161:                    throws Exception {
162:                UnifiedClassLoader ucl = new UnifiedClassLoader(url, origURL);
163:                if (addToRepository)
164:                    this .addClassLoader(ucl);
165:                return ucl;
166:            }
167:
168:            public Class loadClass(String name, boolean resolve, ClassLoader cl)
169:                    throws ClassNotFoundException {
170:                throw new ClassNotFoundException(
171:                        "loadClass(String,boolean,ClassLoader) not supported");
172:            }
173:
174:            public URL getResource(String name, ClassLoader cl) {
175:                URL res = null;
176:                if (cl instanceof  UnifiedClassLoader) {
177:                    UnifiedClassLoader ucl = (UnifiedClassLoader) cl;
178:                    res = ucl.getResourceLocally(name);
179:                } else {
180:                    res = cl.getResource(name);
181:                }
182:                return res;
183:            }
184:
185:            public void getResources(String name, ClassLoader cl, List urls) {
186:                Enumeration resURLs = null;
187:                try {
188:                    if (cl instanceof  UnifiedClassLoader) {
189:                        UnifiedClassLoader ucl = (UnifiedClassLoader) cl;
190:                        resURLs = ucl.findResourcesLocally(name);
191:                    } else {
192:                        resURLs = cl.getResources(name);
193:                    }
194:                    while (resURLs.hasMoreElements())
195:                        urls.add(resURLs.nextElement());
196:                } catch (Exception e) {
197:                }
198:            }
199:        }
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