package com.alibaba.otter.canal.parse.inbound.mysql;
import org.apache.commons.lang.StringUtils;
import com.alibaba.otter.canal.parse.CanalEventParser;
import com.alibaba.otter.canal.parse.exception.CanalParseException;
import com.alibaba.otter.canal.parse.inbound.ErosaConnection;
import com.alibaba.otter.canal.parse.index.CanalLogPositionManager;
import com.alibaba.otter.canal.parse.support.AuthenticationInfo;
import com.alibaba.otter.canal.protocol.position.EntryPosition;
import com.alibaba.otter.canal.protocol.position.LogPosition;
/**
* 基于本地binlog文件的复制
*
* @author jianghang 2012-6-21 下午04:07:33
* @version 1.0.0
*/
public class LocalBinlogEventParser extends AbstractMysqlEventParser implements CanalEventParser {
// 数据库信息
private AuthenticationInfo masterInfo;
private EntryPosition masterPosition; // binlog信息
private String directory;
private boolean needWait = false;
private int bufferSize = 16 * 1024;
public LocalBinlogEventParser(){
// this.runningInfo = new AuthenticationInfo();
}
@Override
protected ErosaConnection buildErosaConnection() {
return buildLocalBinLogConnection();
}
public void start() throws CanalParseException {
if (runningInfo == null) { // 第一次链接主库
runningInfo = masterInfo;
}
super.start();
}
private ErosaConnection buildLocalBinLogConnection() {
LocalBinLogConnection connection = new LocalBinLogConnection();
connection.setBufferSize(this.bufferSize);
connection.setDirectory(this.directory);
connection.setNeedWait(this.needWait);
return connection;
}
@Override
protected EntryPosition findStartPosition(ErosaConnection connection) {
// 处理逻辑
// 1. 首先查询上一次解析成功的最后一条记录
// 2. 存在最后一条记录，判断一下当前记录是否发生过主备切换
// // a. 无机器切换，直接返回
// // b. 存在机器切换，按最后一条记录的stamptime进行查找
// 3. 不存在最后一条记录，则从默认的位置开始启动
LogPosition logPosition = logPositionManager.getLatestIndexBy(destination);
if (logPosition == null) {// 找不到历史成功记录
EntryPosition entryPosition = masterPosition;
// 判断一下是否需要按时间订阅
if (StringUtils.isEmpty(entryPosition.getJournalName())) {
// 如果没有指定binlogName，尝试按照timestamp进行查找
if (entryPosition.getTimestamp() != null) {
return new EntryPosition(entryPosition.getTimestamp());
}
} else {
if (entryPosition.getPosition() != null) {
// 如果指定binlogName + offest，直接返回
return entryPosition;
} else {
return new EntryPosition(entryPosition.getTimestamp());
}
}
} else {
return logPosition.getPostion();
}
return null;
}
// ========================= setter / getter =========================
public void setLogPositionManager(CanalLogPositionManager logPositionManager) {
this.logPositionManager = logPositionManager;
}
public void setDirectory(String directory) {
this.directory = directory;
}
public void setBufferSize(int bufferSize) {
this.bufferSize = bufferSize;
}
public void setMasterPosition(EntryPosition masterPosition) {
this.masterPosition = masterPosition;
}
public void setMasterInfo(AuthenticationInfo masterInfo) {
this.masterInfo = masterInfo;
}
public boolean isNeedWait() {
return needWait;
}
public void setNeedWait(boolean needWait) {
this.needWait = needWait;
}
}