| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| |
| package org.apache.catalina.tribes.io; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.ObjectInputStream; |
| import java.io.ObjectStreamClass; |
| |
| /** |
| * Custom subclass of <code>ObjectInputStream</code> that loads from the |
| * class loader for this web application. This allows classes defined only |
| * with the web application to be found correctly. |
| * |
| * @author Craig R. McClanahan |
| * @author Bip Thelin |
| * @author Filip Hanik |
| * @version $Revision$, $Date$ |
| */ |
| |
| public final class ReplicationStream extends ObjectInputStream { |
| |
| |
| /** |
| * The class loader we will use to resolve classes. |
| */ |
| private ClassLoader[] classLoaders = null; |
| |
| |
| /** |
| * Construct a new instance of CustomObjectInputStream |
| * |
| * @param stream The input stream we will read from |
| * @param classLoader The class loader used to instantiate objects |
| * |
| * @exception IOException if an input/output error occurs |
| */ |
| public ReplicationStream(InputStream stream, |
| ClassLoader[] classLoaders) |
| throws IOException { |
| |
| super(stream); |
| this.classLoaders = classLoaders; |
| } |
| |
| /** |
| * Load the local class equivalent of the specified stream class |
| * description, by using the class loader assigned to this Context. |
| * |
| * @param classDesc Class description from the input stream |
| * |
| * @exception ClassNotFoundException if this class cannot be found |
| * @exception IOException if an input/output error occurs |
| */ |
| public Class resolveClass(ObjectStreamClass classDesc) |
| throws ClassNotFoundException, IOException { |
| String name = classDesc.getName(); |
| boolean tryRepFirst = name.startsWith("org.apache.catalina.tribes"); |
| try { |
| try |
| { |
| if ( tryRepFirst ) return findReplicationClass(name); |
| else return findExternalClass(name); |
| } |
| catch ( Exception x ) |
| { |
| if ( tryRepFirst ) return findExternalClass(name); |
| else return findReplicationClass(name); |
| } |
| } catch (ClassNotFoundException e) { |
| return super.resolveClass(classDesc); |
| } |
| } |
| |
| public Class findReplicationClass(String name) |
| throws ClassNotFoundException, IOException { |
| Class clazz = Class.forName(name, false, getClass().getClassLoader()); |
| return clazz; |
| } |
| |
| public Class findExternalClass(String name) throws ClassNotFoundException { |
| ClassNotFoundException cnfe = null; |
| for (int i=0; i<classLoaders.length; i++ ) { |
| try { |
| Class clazz = Class.forName(name, false, classLoaders[i]); |
| return clazz; |
| } catch ( ClassNotFoundException x ) { |
| cnfe = x; |
| } |
| } |
| if ( cnfe != null ) throw cnfe; |
| else throw new ClassNotFoundException(name); |
| } |
| |
| public void close() throws IOException { |
| this.classLoaders = null; |
| super.close(); |
| } |
| |
| |
| } |