001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    
018    package org.apache.commons.proxy.interceptor;
019    
020    import org.apache.commons.proxy.Interceptor;
021    import org.apache.commons.proxy.Invocation;
022    
023    import java.io.ByteArrayInputStream;
024    import java.io.ByteArrayOutputStream;
025    import java.io.IOException;
026    import java.io.ObjectInputStream;
027    import java.io.ObjectOutputStream;
028    
029    /**
030     * An interceptor which makes a serialized copy of all parameters and return values.  This
031     * is useful when testing remote services to ensure that all parameter/return types
032     * are in fact serializable/deserializable.
033     * @since 1.0
034     */
035    public class SerializingInterceptor implements Interceptor
036    {
037        public Object intercept(Invocation invocation) throws Throwable
038        {
039            Object[] arguments = invocation.getArguments();
040            for (int i = 0; i < arguments.length; i++)
041            {
042                arguments[i] = serializedCopy(arguments[i]);
043            }
044            return serializedCopy(invocation.proceed());
045        }
046    
047        private Object serializedCopy(Object original)
048        {
049            try
050            {
051                final ByteArrayOutputStream bout = new ByteArrayOutputStream();
052                final ObjectOutputStream oout = new ObjectOutputStream(bout);
053                oout.writeObject(original);
054                oout.close();
055                bout.close();
056                final ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
057                final ObjectInputStream oin = new ObjectInputStream(bin);
058                final Object copy = oin.readObject();
059                oin.close();
060                bin.close();
061                return copy;
062            }
063            catch (IOException e)
064            {
065                throw new RuntimeException( "Unable to make serialized copy of " +
066                        original.getClass().getName() + " object.", e );
067            }
068            catch (ClassNotFoundException e)
069            {
070                throw new RuntimeException( "Unable to make serialized copy of " +
071                        original.getClass().getName() + " object.", e );
072            }
073        }
074    }