com.talent.mysql.packet.MysqlResponsePacket.java Source code

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Here is the source code for com.talent.mysql.packet.MysqlResponsePacket.java

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/*
 * Copyright (c) 2013, OpenCloudDB/MyCAT and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software;Designed and Developed mainly by many Chinese 
 * opensource volunteers. you can redistribute it and/or modify it under the 
 * terms of the GNU General Public License version 2 only, as published by the
 * Free Software Foundation.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 * 
 * Any questions about this component can be directed to it's project Web address 
 * https://code.google.com/p/opencloudb/.
 *
 */
package com.talent.mysql.packet;

import io.netty.buffer.ByteBuf;

import java.nio.ByteOrder;
import java.util.ArrayList;
import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.talent.balance.common.BalancePacket;
import com.talent.balance.common.ParseUtils;
import com.talent.mysql.packet.factory.MysqlHeaderFactory;
import com.talent.mysql.packet.factory.MysqlHeaderFactory.MysqlHeader;
import com.talent.nio.api.Packet;
import com.talent.nio.communicate.intf.DecoderIntf.DecodeException;
import com.talent.nio.communicate.intf.DecoderIntf.PacketWithMeta;

/**
 * 
 * @filename:    com.talent.mysql.packet.MysqlResponsePacket
 * @copyright:   Copyright (c)2010
 * @company:     talent
 * @author:      
 * @version:     1.0
 * @create time: 20131225 ?6:28:48
 * @record
 * <table cellPadding="3" cellSpacing="0" style="width:600px">
 * <thead style="font-weight:bold;background-color:#e3e197">
 *    <tr>   <td>date</td>   <td>author</td>      <td>version</td>   <td>description</td></tr>
 * </thead>
 * <tbody style="background-color:#ffffeb">
 *    <tr><td>20131225</td>   <td></td>   <td>1.0</td>   <td>create</td></tr>
 * </tbody>
 * </table>
 */
public abstract class MysqlResponsePacket<T extends MysqlResponsePacket<?>> extends BalancePacket {
    /**
     * 
     */
    private static final long serialVersionUID = 7952416644049477509L;
    private static Logger log = LoggerFactory.getLogger(MysqlResponsePacket.class);

    private MysqlHeader mysqlHeader = null;

    /**
     * 
     */
    public MysqlResponsePacket(MysqlHeader mysqlHeader) {
        this.setMysqlHeader(mysqlHeader);
    }

    public MysqlResponsePacket() {

    }

    public PacketWithMeta<Packet> decode(ByteBuf byteBuf) throws DecodeException {
        int capacity = byteBuf.capacity();
        PacketWithMeta<Packet> packetWithMeta = null;
        while (true) {
            if ((capacity - byteBuf.readerIndex()) < MysqlHeader.HEADER_LEN) //?
            {
                if (packetWithMeta != null) {
                    packetWithMeta.setPacketLenght(byteBuf.readerIndex());
                }

                return packetWithMeta;
            }

            if (byteBuf.order() == ByteOrder.BIG_ENDIAN) {
                byteBuf = byteBuf.order(ByteOrder.LITTLE_ENDIAN);
            }

            MysqlHeader header = MysqlHeaderFactory.borrow();
            header.decode(byteBuf);

            ParseUtils.processReadIndex(byteBuf);

            //?
            if (capacity - byteBuf.readerIndex() < header.getBodyLength()) //?
            {
                if (packetWithMeta != null) {
                    packetWithMeta.setPacketLenght(byteBuf.readerIndex());
                }
                return packetWithMeta;
            } else {
                T t = decodeBody(byteBuf, header);
                if (packetWithMeta == null) {
                    packetWithMeta = new PacketWithMeta<Packet>();

                    List<Packet> packets = new ArrayList<Packet>();
                    packets.add(t);

                    packetWithMeta.setPackets(packets);
                    packetWithMeta.setPacketLenght(byteBuf.readerIndex());
                    return packetWithMeta;

                    //               com.talent.mysql.packet.factory.MysqlHeaderFactory.returnObj(t.getMysqlHeader());
                } else {
                    packetWithMeta.getPackets().add(t);
                }
            }
        }

    }

    /**
     * 
     * @param byteBuf
     * @return
     */
    public void decodeHeader(ByteBuf byteBuf) {
        MysqlHeader mysqlHeader = MysqlHeaderFactory.borrow();
        mysqlHeader.decode(byteBuf);
    }

    public abstract T decodeBody(ByteBuf byteBuf, MysqlHeader mysqlHeader) throws DecodeException;

    /**
     * @param args
     */
    public static void main(String[] args) {

    }

    @Override
    public String getSeqNo() {
        return null;
    }

    public MysqlHeader getMysqlHeader() {
        return mysqlHeader;
    }

    public void setMysqlHeader(MysqlHeader mysqlHeader) {
        this.mysqlHeader = mysqlHeader;
    }
}