001 /* DefaultLoaderRepository.java -- Manages class loaders for the servers. 002 Copyright (C) 2007 Free Software Foundation, Inc. 003 004 This file is part of GNU Classpath. 005 006 GNU Classpath is free software; you can redistribute it and/or modify 007 it under the terms of the GNU General Public License as published by 008 the Free Software Foundation; either version 2, or (at your option) 009 any later version. 010 011 GNU Classpath is distributed in the hope that it will be useful, but 012 WITHOUT ANY WARRANTY; without even the implied warranty of 013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014 General Public License for more details. 015 016 You should have received a copy of the GNU General Public License 017 along with GNU Classpath; see the file COPYING. If not, write to the 018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 019 02110-1301 USA. 020 021 Linking this library statically or dynamically with other modules is 022 making a combined work based on this library. Thus, the terms and 023 conditions of the GNU General Public License cover the whole 024 combination. 025 026 As a special exception, the copyright holders of this library give you 027 permission to link this library with independent modules to produce an 028 executable, regardless of the license terms of these independent 029 modules, and to copy and distribute the resulting executable under 030 terms of your choice, provided that you also meet, for each linked 031 independent module, the terms and conditions of the license of that 032 module. An independent module is a module which is not derived from 033 or based on this library. If you modify this library, you may extend 034 this exception to your version of the library, but you are not 035 obligated to do so. If you do not wish to do so, delete this 036 exception statement from your version. */ 037 038 package javax.management; 039 040 import 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 public static Class loadClass(String name) 081 throws ClassNotFoundException 082 { 083 List<MBeanServer> servers = MBeanServerFactory.findMBeanServer(null); 084 for (MBeanServer server : servers) 085 { 086 try 087 { 088 return server.getClassLoaderRepository().loadClass(name); 089 } 090 catch (ClassNotFoundException e) 091 { 092 /* Ignored; try the next server. */ 093 } 094 } 095 throw new ClassNotFoundException("The class loaders of all registered " + 096 "servers failed to load the class, " + 097 name); 098 } 099 100 /** 101 * <p> 102 * Attempts to load the given class using class loaders 103 * supplied by the repository of each {@link MBeanServer}. 104 * The {@link ClassLoader#loadClass(String)} 105 * method of each class loader is called. If the method 106 * returns successfully, then the returned {@link Class} instance 107 * is returned. If a {@link ClassNotFoundException} is thrown, 108 * then the next loader is tried. Any other exception thrown 109 * by the method is passed back to the caller. This method 110 * throws a {@link ClassNotFoundException} itself if all the 111 * class loaders listed prove fruitless. 112 * </p> 113 * <p> 114 * Note that this method may deadlock if called simultaneously 115 * by two class loaders in the list. 116 * {@link loadClassBefore(ClassLoader, String)} should be used 117 * in preference to this method to avoid this. 118 * </p> 119 * 120 * @param exclude the class loader to exclude, or <code>null</code> 121 * to obtain the same behaviour as {@link #loadClass(String)}. 122 * @param name the name of the class to load. 123 * @return the loaded class. 124 * @throws ClassNotFoundException if all the class loaders fail 125 * to load the class. 126 */ 127 public static Class loadClassWithout(ClassLoader exclude, String name) 128 throws ClassNotFoundException 129 { 130 List<MBeanServer> servers = MBeanServerFactory.findMBeanServer(null); 131 for (MBeanServer server : servers) 132 { 133 try 134 { 135 return server.getClassLoaderRepository().loadClassWithout(exclude, 136 name); 137 } 138 catch (ClassNotFoundException e) 139 { 140 /* Ignored; try the next server. */ 141 } 142 } 143 throw new ClassNotFoundException("The class loaders of all registered " + 144 "servers failed to load the class, " + 145 name); 146 } 147 148 }