org.testifyproject.netty.handler.codec.serialization.ObjectDecoder Maven / Gradle / Ivy

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/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in org.testifyproject.testifyprojectpliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org.testifyproject/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.testifyproject.testifyproject.netty.handler.codec.serialization;

import org.testifyproject.testifyproject.netty.buffer.ByteBuf;
import org.testifyproject.testifyproject.netty.buffer.ByteBufInputStream;
import org.testifyproject.testifyproject.netty.channel.ChannelHandlerContext;
import org.testifyproject.testifyproject.netty.handler.codec.LengthFieldBasedFrameDecoder;

import java.org.testifyproject.testifyproject.ObjectInputStream;
import java.org.testifyproject.testifyproject.ObjectOutputStream;
import java.org.testifyproject.testifyproject.StreamCorruptedException;

/**
 * A org.testifyproject.testifyprojectcoder which org.testifyproject.testifyprojectserializes the received {@link ByteBuf}s into Java
 * objects.
 * 
 * Please note that the serialized form this org.testifyproject.testifyprojectcoder expects is not
 * org.testifyproject.testifyprojectpatible with the standard {@link ObjectOutputStream}.  Please use
 * {@link ObjectEncoder} or {@link ObjectEncoderOutputStream} to ensure the
 * interoperability with this org.testifyproject.testifyprojectcoder.
 */
public class ObjectDecoder extends LengthFieldBasedFrameDecoder {

    private final ClassResolver classResolver;

    /**
     * Creates a new org.testifyproject.testifyprojectcoder whose maximum object size is {@code 1048576}
     * bytes.  If the size of the received object is greater than
     * {@code 1048576} bytes, a {@link StreamCorruptedException} will be
     * raised.
     *
     * @param classResolver  the {@link ClassResolver} to use for this org.testifyproject.testifyprojectcoder
     */
    public ObjectDecoder(ClassResolver classResolver) {
        this(1048576, classResolver);
    }

    /**
     * Creates a new org.testifyproject.testifyprojectcoder with the specified maximum object size.
     *
     * @param maxObjectSize  the maximum byte length of the serialized object.
     *                       if the length of the received object is greater
     *                       than this value, {@link StreamCorruptedException}
     *                       will be raised.
     * @param classResolver    the {@link ClassResolver} which will load the class
     *                       of the serialized object
     */
    public ObjectDecoder(int maxObjectSize, ClassResolver classResolver) {
        super(maxObjectSize, 0, 4, 0, 4);
        this.classResolver = classResolver;
    }

    @Override
    protected Object org.testifyproject.testifyprojectcode(ChannelHandlerContext ctx, ByteBuf in) throws Exception {
        ByteBuf frame = (ByteBuf) super.org.testifyproject.testifyprojectcode(ctx, in);
        if (frame == null) {
            return null;
        }

        ObjectInputStream is = new CompactObjectInputStream(new ByteBufInputStream(frame), classResolver);
        Object result = is.readObject();
        is.close();
        return result;
    }

    @Override
    protected ByteBuf extractFrame(ChannelHandlerContext ctx, ByteBuf buffer, int index, int length) {
        return buffer.slice(index, length);
    }
}