com.mobius.software.android.iotbroker.mqtt.net.MQDecoder.java Source code

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Here is the source code for com.mobius.software.android.iotbroker.mqtt.net.MQDecoder.java

Source

package com.mobius.software.android.iotbroker.mqtt.net;

/**
 * Mobius Software LTD
 * Copyright 2015-2016, Mobius Software LTD
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageDecoder;

import java.util.List;

import com.mobius.software.android.iotbroker.mqtt.parser.MQParser;
import com.mobius.software.android.iotbroker.mqtt.parser.header.api.MQMessage;

public class MQDecoder extends ByteToMessageDecoder {
    @Override
    protected void decode(ChannelHandlerContext ctx, ByteBuf buf, List<Object> out) throws Exception {
        ByteBuf nextHeader = null;
        do {
            if (buf.readableBytes() > 1)
                nextHeader = MQParser.next(buf);

            if (nextHeader != null) {
                buf.readBytes(nextHeader, nextHeader.capacity());
                try {
                    MQMessage header = MQParser.decode(nextHeader);
                    out.add(header);
                } catch (Exception e) {
                    buf.resetReaderIndex();
                    ctx.channel().pipeline().remove(this);
                    throw e;
                } finally {
                    nextHeader.release();
                }
            }
        } while (buf.readableBytes() > 1 && nextHeader != null);
    }
}