001/* DefaultLoaderRepository.java -- Manages class loaders for the servers. 002 Copyright (C) 2007 Free Software Foundation, Inc. 003 004This file is part of GNU Classpath. 005 006GNU Classpath is free software; you can redistribute it and/or modify 007it under the terms of the GNU General Public License as published by 008the Free Software Foundation; either version 2, or (at your option) 009any later version. 010 011GNU Classpath is distributed in the hope that it will be useful, but 012WITHOUT ANY WARRANTY; without even the implied warranty of 013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014General Public License for more details. 015 016You should have received a copy of the GNU General Public License 017along with GNU Classpath; see the file COPYING. If not, write to the 018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 01902110-1301 USA. 020 021Linking this library statically or dynamically with other modules is 022making a combined work based on this library. Thus, the terms and 023conditions of the GNU General Public License cover the whole 024combination. 025 026As a special exception, the copyright holders of this library give you 027permission to link this library with independent modules to produce an 028executable, regardless of the license terms of these independent 029modules, and to copy and distribute the resulting executable under 030terms of your choice, provided that you also meet, for each linked 031independent module, the terms and conditions of the license of that 032module. An independent module is a module which is not derived from 033or based on this library. If you modify this library, you may extend 034this exception to your version of the library, but you are not 035obligated to do so. If you do not wish to do so, delete this 036exception statement from your version. */ 037 038package javax.management; 039 040import java.util.List; 041 042/** 043 * Maintains a list of the {@link ClassLoader} instances 044 * registered with the management servers, allowing it 045 * to be used to load classes. In early versions of the 046 * JMX API, this class represented a shared repository for 047 * the classloaders of all management servers. The management 048 * of classloaders is now decentralised and this class is 049 * deprecated. The old behaviour is emulated by consulting 050 * the {@link MBeanServer#getClassLoaderRepository()} method 051 * of all the servers obtained from 052 * {@link MBeanServerFactory#findMBeanServer(String)}. Use of 053 * this class should be avoided in new code. 054 * 055 * @author Andrew John Hughes (gnu_andrew@member.fsf.org) 056 * @since 1.5 057 * @deprecated Use {@link MBeanServer#getClassLoaderRepository()} 058 * instead. 059 */ 060@Deprecated public class DefaultLoaderRepository 061{ 062 063 /** 064 * Attempts to load the given class using class loaders 065 * supplied by the repository of each {@link MBeanServer}. 066 * The {@link ClassLoader#loadClass(String)} 067 * method of each class loader is called. If the method 068 * returns successfully, then the returned {@link Class} instance 069 * is returned. If a {@link ClassNotFoundException} is thrown, 070 * then the next loader is tried. Any other exception thrown 071 * by the method is passed back to the caller. This method 072 * throws a {@link ClassNotFoundException} itself if all the 073 * class loaders listed prove fruitless. 074 * 075 * @param name the name of the class to load. 076 * @return the loaded class. 077 * @throws ClassNotFoundException if all the class loaders fail 078 * to load the class. 079 */ 080 // API issue with lack of <?> on Class 081 @SuppressWarnings("unchecked") 082 public static Class loadClass(String name) 083 throws ClassNotFoundException 084 { 085 List<MBeanServer> servers = MBeanServerFactory.findMBeanServer(null); 086 for (MBeanServer server : servers) 087 { 088 try 089 { 090 return server.getClassLoaderRepository().loadClass(name); 091 } 092 catch (ClassNotFoundException e) 093 { 094 /* Ignored; try the next server. */ 095 } 096 } 097 throw new ClassNotFoundException("The class loaders of all registered " + 098 "servers failed to load the class, " + 099 name); 100 } 101 102 /** 103 * <p> 104 * Attempts to load the given class using class loaders 105 * supplied by the repository of each {@link MBeanServer}. 106 * The {@link ClassLoader#loadClass(String)} 107 * method of each class loader is called. If the method 108 * returns successfully, then the returned {@link Class} instance 109 * is returned. If a {@link ClassNotFoundException} is thrown, 110 * then the next loader is tried. Any other exception thrown 111 * by the method is passed back to the caller. This method 112 * throws a {@link ClassNotFoundException} itself if all the 113 * class loaders listed prove fruitless. 114 * </p> 115 * <p> 116 * Note that this method may deadlock if called simultaneously 117 * by two class loaders in the list. 118 * {@link loadClassBefore(ClassLoader, String)} should be used 119 * in preference to this method to avoid this. 120 * </p> 121 * 122 * @param exclude the class loader to exclude, or <code>null</code> 123 * to obtain the same behaviour as {@link #loadClass(String)}. 124 * @param name the name of the class to load. 125 * @return the loaded class. 126 * @throws ClassNotFoundException if all the class loaders fail 127 * to load the class. 128 */ 129 // API issue with lack of <?> on Class 130 @SuppressWarnings("unchecked") 131 public static Class loadClassWithout(ClassLoader exclude, String name) 132 throws ClassNotFoundException 133 { 134 List<MBeanServer> servers = MBeanServerFactory.findMBeanServer(null); 135 for (MBeanServer server : servers) 136 { 137 try 138 { 139 return server.getClassLoaderRepository().loadClassWithout(exclude, 140 name); 141 } 142 catch (ClassNotFoundException e) 143 { 144 /* Ignored; try the next server. */ 145 } 146 } 147 throw new ClassNotFoundException("The class loaders of all registered " + 148 "servers failed to load the class, " + 149 name); 150 } 151 152}