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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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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 compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   https://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 io.netty.handler.codec.marshalling;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
import io.netty.handler.codec.TooLongFrameException;
import org.jboss.marshalling.ByteInput;
import org.jboss.marshalling.Unmarshaller;

import java.io.StreamCorruptedException;
/**
 * Decoder which MUST be used with {@link MarshallingEncoder}.
 *
 * A {@link LengthFieldBasedFrameDecoder} which use an {@link Unmarshaller} to read the Object out
 * of the {@link ByteBuf}.
 *
 */
public class MarshallingDecoder extends LengthFieldBasedFrameDecoder {

    private final UnmarshallerProvider provider;

    /**
     * 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.
     *
     */
    public MarshallingDecoder(UnmarshallerProvider provider) {
        this(provider, 1048576);
    }

    /**
     * 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 TooLongFrameException}
     *                       will be raised.
     */
    public MarshallingDecoder(UnmarshallerProvider provider, int maxObjectSize) {
        super(maxObjectSize, 0, 4, 0, 4);
        this.provider = provider;
    }

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

        Unmarshaller unmarshaller = provider.getUnmarshaller(ctx);
        ByteInput input = new ChannelBufferByteInput(frame);

        try {
            unmarshaller.start(input);
            Object obj = unmarshaller.readObject();
            unmarshaller.finish();
            return obj;
        } finally {
            // Call close in a finally block as the ReplayingDecoder will throw an Error if not enough bytes are
            // readable. This helps to be sure that we do not leak resource
            unmarshaller.close();
        }
    }

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