com.tesora.dve.mysqlapi.repl.messages.MyFormatDescriptionLogEvent.java Source code

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Here is the source code for com.tesora.dve.mysqlapi.repl.messages.MyFormatDescriptionLogEvent.java

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package com.tesora.dve.mysqlapi.repl.messages;

/*
 * #%L
 * Tesora Inc.
 * Database Virtualization Engine
 * %%
 * Copyright (C) 2011 - 2014 Tesora Inc.
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 * 
 * This program 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 Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 * #L%
 */

import io.netty.buffer.ByteBuf;
import io.netty.util.CharsetUtil;

import java.util.HashMap;
import java.util.Map;

import org.apache.log4j.Logger;

import com.tesora.dve.db.mysql.common.MysqlAPIUtils;
import com.tesora.dve.exceptions.PEException;

public class MyFormatDescriptionLogEvent extends MyLogEventPacket {
    private static final Logger logger = Logger.getLogger(MyFormatDescriptionLogEvent.class);

    private static final int ST_SERVER_VER_LEN = 50;

    public enum MyBinLogVerType {
        MySQL_3_23((byte) 0x01), MySQL_4_0_2_to_4_1((byte) 0x03), MySQL_5_0((byte) 0x04);

        private final byte typeasByte;

        MyBinLogVerType(byte b) {
            typeasByte = b;
        }

        public static MyBinLogVerType fromByte(byte b) {
            for (MyBinLogVerType mt : values()) {
                if (mt.typeasByte == b) {
                    return mt;
                }
            }
            return null;
        }
    }

    short binaryLogVersion;
    String serverVersion;
    long createTime;
    short eventTypeLength;
    Map<MyLogEventType, Byte> eventTypeValues = new HashMap<MyLogEventType, Byte>();

    public MyFormatDescriptionLogEvent(MyReplEventCommonHeader ch) {
        super(ch);
    }

    @Override
    public void accept(ReplicationVisitorTarget visitorTarget) throws PEException {
        visitorTarget.visit((MyFormatDescriptionLogEvent) this);
    }

    @Override
    public void unmarshallMessage(ByteBuf cb) {
        binaryLogVersion = cb.readShort();
        serverVersion = MysqlAPIUtils.readBytesAsString(cb, ST_SERVER_VER_LEN, CharsetUtil.UTF_8);
        createTime = cb.readUnsignedInt();
        eventTypeLength = cb.readUnsignedByte();
        int numberOfEntries = cb.readableBytes() - 1;//string is null terminated.

        switch (MyBinLogVerType.fromByte((byte) binaryLogVersion)) {

        case MySQL_5_0:
            for (int i = 1; i <= numberOfEntries; i++) {
                eventTypeValues.put(MyLogEventType.fromByte((byte) i), cb.readByte());
            }
            cb.skipBytes(1);//throw out EOF
            break;

        default:
            // TODO throw????
            logger.error("Cannot process binary log messages that are not for MySQL 5.0");
        }
    }

    @Override
    public void marshallMessage(ByteBuf cb) {
        cb.writeShort(binaryLogVersion);
        cb.writeBytes(serverVersion.getBytes(CharsetUtil.UTF_8));
        cb.writeInt((int) createTime);
        cb.writeByte(0xFF & eventTypeLength);
        switch (MyBinLogVerType.fromByte((byte) binaryLogVersion)) {

        case MySQL_5_0:
            for (int i = 1; i <= eventTypeValues.size(); i++) {
                cb.writeByte(eventTypeValues.get(MyLogEventType.fromByte((byte) i)));
            }
            cb.writeZero(1);
            break;

        default:
            break;
        }
    }

    public short getBinaryLogVersion() {
        return binaryLogVersion;
    }

    public void setBinaryLogVersion(short binaryLogVersion) {
        this.binaryLogVersion = binaryLogVersion;
    }

    public Map<MyLogEventType, Byte> getEventTypeValues() {
        return eventTypeValues;
    }

    public void setEventTypeValues(Map<MyLogEventType, Byte> eventTypeValues) {
        this.eventTypeValues = eventTypeValues;
    }
}