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Diffstat (limited to 'libjava/classpath/javax/management/loading/ClassLoaderRepository.java')
| -rw-r--r-- | libjava/classpath/javax/management/loading/ClassLoaderRepository.java | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/libjava/classpath/javax/management/loading/ClassLoaderRepository.java b/libjava/classpath/javax/management/loading/ClassLoaderRepository.java new file mode 100644 index 000000000..cfd031e62 --- /dev/null +++ b/libjava/classpath/javax/management/loading/ClassLoaderRepository.java @@ -0,0 +1,138 @@ +/* ClassLoaderRepository.java -- Represents a collection of class loadersx. + Copyright (C) 2006 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + +package javax.management.loading; + +/** + * Implementations of this interface maintain a list of + * {@link ClassLoader}s for use by the management servers, + * allowing classes to be loaded by the first {@link ClassLoader} + * that will do so. A class loader is added to the list + * whenever a {@link ClassLoader} instance is registered with + * the management server, and it does not implement the + * {@link PrivateClassLoader} interface. They are removed when + * unregistered. The first class loader in the list is always + * the one which was used to load the management server itself. + * + * @author Andrew John Hughes (gnu_andrew@member.fsf.org) + * @since 1.5 + * @see MBeanServerFactory + */ +public interface ClassLoaderRepository +{ + + /** + * Attempts to load the given class using class loaders + * supplied by the list. The {@link ClassLoader#loadClass(String)} + * method of each class loader is called. If the method + * returns successfully, then the returned {@link Class} instance + * is returned. If a {@link ClassNotFoundException} is thrown, + * then the next loader is tried. Any other exception thrown + * by the method is passed back to the caller. This method + * throws a {@link ClassNotFoundException} itself if all the + * class loaders listed prove fruitless. + * + * @param name the name of the class to load. + * @return the loaded class. + * @throws ClassNotFoundException if all the class loaders fail + * to load the class. + */ + Class<?> loadClass(String name) + throws ClassNotFoundException; + + /** + * <p> + * Attempts to load the given class using class loaders + * supplied by the list, stopping when the specified + * loader is reached. The {@link ClassLoader#loadClass(String)} + * method of each class loader is called. If the method + * returns successfully, then the returned {@link Class} instance + * is returned. If a {@link ClassNotFoundException} is thrown, + * then the next loader is tried. Any other exception thrown + * by the method is passed back to the caller. This method + * throws a {@link ClassNotFoundException} itself if all the + * class loaders listed prove fruitless. + * </p> + * <p> + * This method is usually used by the class loader specified + * by the <code>stop</code> argument to load classes using the + * loaders that appear before it in the list. By stopping when + * the loader is reached, the deadlock that occurs when the loader + * is merely skipped is avoided. + * </p> + * + * @param stop the class loader at which to stop, or <code>null</code> + * to obtain the same behaviour as {@link #loadClass(String)}. + * @param name the name of the class to load. + * @return the loaded class. + * @throws ClassNotFoundException if all the class loaders fail + * to load the class. + */ + Class<?> loadClassBefore(ClassLoader stop, String name) + throws ClassNotFoundException; + + /** + * <p> + * Attempts to load the given class using class loaders + * supplied by the list, excluding the one specified. + * The {@link ClassLoader#loadClass(String)} + * method of each class loader is called. If the method + * returns successfully, then the returned {@link Class} instance + * is returned. If a {@link ClassNotFoundException} is thrown, + * then the next loader is tried. Any other exception thrown + * by the method is passed back to the caller. This method + * throws a {@link ClassNotFoundException} itself if all the + * class loaders listed prove fruitless. + * </p> + * <p> + * Note that this method may deadlock if called simultaneously + * by two class loaders in the list. + * {@link loadClassBefore(ClassLoader, String)} should be used + * in preference to this method to avoid this. + * </p> + * + * @param exclude the class loader to exclude, or <code>null</code> + * to obtain the same behaviour as {@link #loadClass(String)}. + * @param name the name of the class to load. + * @return the loaded class. + * @throws ClassNotFoundException if all the class loaders fail + * to load the class. + */ + Class<?> loadClassWithout(ClassLoader exclude, String name) + throws ClassNotFoundException; + +} |