org.tinygroup.nettyremote.codec.serialization.HessianDecoder.java Source code

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Here is the source code for org.tinygroup.nettyremote.codec.serialization.HessianDecoder.java

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/**
 *  Copyright (c) 1997-2013, www.tinygroup.org (luo_guo@icloud.com).
 *
 *  Licensed under the GPL, Version 3.0 (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.gnu.org/licenses/gpl.html
 *
 *  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.tinygroup.nettyremote.codec.serialization;

import com.caucho.hessian.io.HessianInput;
import com.caucho.hessian.io.SerializerFactory;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufInputStream;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
import io.netty.handler.codec.serialization.ClassResolver;

import java.io.StreamCorruptedException;

public class HessianDecoder extends LengthFieldBasedFrameDecoder {

    private final ClassResolver classResolver;

    /**
     * Creates a new decoder 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 decoder
     */
    public HessianDecoder(ClassResolver classResolver) {
        this(1048576, classResolver);
    }

    /**
     * Creates a new decoder 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 HessianDecoder(int maxObjectSize, ClassResolver classResolver) {
        super(maxObjectSize, 0, 4, 0, 4);
        this.classResolver = classResolver;
    }

    @Override
    protected Object decode(ChannelHandlerContext ctx, ByteBuf in) throws Exception {
        ByteBuf frame = (ByteBuf) super.decode(ctx, in);
        if (frame == null) {
            return null;
        }
        SerializerFactory serializerFactory = new SerializerFactory();
        serializerFactory.addFactory(new BigDecimalSerializerFactory());
        HessianInput hin = new HessianInput(new ByteBufInputStream(frame));
        hin.setSerializerFactory(serializerFactory);
        return hin.readObject();
        // 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);
    }
}