com.dianping.puma.parser.mysql.event.AbstractBinlogEvent.java Source code

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Here is the source code for com.dianping.puma.parser.mysql.event.AbstractBinlogEvent.java

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/**
 * Project: ${puma-parser.aid}
 * 
 * File Created at 2012-6-24
 * $Id$
 * 
 * Copyright 2010 dianping.com.
 * All rights reserved.
 *
 * This software is the confidential and proprietary information of
 * Dianping Company. ("Confidential Information").  You shall not
 * disclose such Confidential Information and shall use it only in
 * accordance with the terms of the license agreement you entered into
 * with dianping.com.
 */
package com.dianping.puma.parser.mysql.event;

import com.dianping.puma.common.PumaContext;
import com.dianping.puma.parser.mysql.BinlogConstants;
import com.dianping.puma.utils.PacketUtils;
import org.apache.commons.lang3.builder.ToStringBuilder;

import java.io.IOException;
import java.nio.ByteBuffer;

/**
 * TODO Comment of AbstractBinlogEvent
 * 
 * @author Leo Liang
 * 
 */
public abstract class AbstractBinlogEvent implements BinlogEvent {
    private static final long serialVersionUID = -8136236885229956889L;
    private BinlogHeader header;
    private int checksumAlg = BinlogConstants.CHECKSUM_ALG_OFF;
    private long crc;

    @Override
    public void parse(ByteBuffer buf, PumaContext context, BinlogHeader header) throws IOException {
        this.header = header;
        doParse(buf, context);
        if (!(this.header.getEventType() == BinlogConstants.ROTATE_EVENT)) {
            checksumAlg = context.getChecksumAlg(); // fetch checksum alg
            parseCheckSum(buf);
        }
    }

    @Override
    public BinlogHeader getHeader() {
        return header;
    }

    @Override
    public void setHeader(BinlogHeader header) {
        this.header = header;
    }

    public abstract void doParse(ByteBuffer buf, PumaContext context) throws IOException;

    private void parseCheckSum(ByteBuffer buf) {
        if (checksumAlg != BinlogConstants.CHECKSUM_ALG_OFF && checksumAlg != BinlogConstants.CHECKSUM_ALG_UNDEF) {
            buf.position((int) (this.header.getEventLength() - 4));
            setCrc(PacketUtils.readLong(buf, 4));
        }
    }

    @Override
    public String toString() {
        return new ToStringBuilder(this).append("header", header).append("checksumAlg", checksumAlg)
                .append("crc", crc).toString();
    }

    public void setChecksumAlg(int checksumAlg) {
        this.checksumAlg = checksumAlg;
    }

    public int getChecksumAlg() {
        return checksumAlg;
    }

    public long getCrc() {
        return crc;
    }

    public void setCrc(long crc) {
        this.crc = crc;
    }

    public boolean isRemaining(ByteBuffer buf, PumaContext context) {
        return context.isCheckSum() ? buf.remaining() - 4 > 0 : buf.hasRemaining();
    }

    public int lenRemaining(ByteBuffer buf, PumaContext context) {
        return context.isCheckSum() ? buf.remaining() - 4 : buf.remaining();
    }
}