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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/javax/management/loading
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Diffstat (limited to 'libjava/classpath/javax/management/loading')
-rw-r--r--libjava/classpath/javax/management/loading/ClassLoaderRepository.java138
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diff --git a/libjava/classpath/javax/management/loading/ClassLoaderRepository.java b/libjava/classpath/javax/management/loading/ClassLoaderRepository.java
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+++ b/libjava/classpath/javax/management/loading/ClassLoaderRepository.java
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+/* 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;
+
+}