canal同步mysql

最近项目需要用到es,打算通过canal实现数据增量同步。文末提供源码DEMO

下载请进：项目DEMO

效果图如下：

代码：

pom.xml

<dependency>
<groupId>com.alibaba.otter</groupId>
<artifactId>canal.client</artifactId>
<version>1.1.2</version>
</dependency>

AbstractCanalClient.java

import com.alibaba.otter.canal.client.CanalConnector;
import com.alibaba.otter.canal.protocol.CanalEntry;
import com.alibaba.otter.canal.protocol.Message;

import java.util.List;

/**
* @Auther: kevin
* @Description:
* @Company:
* @Version: 1.0.0
* @Date: Created in 15:44 2018/6/28
* @ProjectName: canal
*/
public class AbstractCanalClient {

protected CanalConnector connector;
protected String filter; //过滤表达式

public void setConnector(CanalConnector connector) {
this.connector = connector;
}

public void setFilter(String filter) {
this.filter = filter;
}

public void start(){
int batchSize = 1000;
int emptyCount = 0;
try {
connector.connect();
connector.subscribe(filter);
int totalEmtryCount = 1200;
while (emptyCount < totalEmtryCount) {
Message message = connector.getWithoutAck(batchSize); // 获取指定数量的数据
long batchId = message.getId();
int size = message.getEntries().size();
if (batchId == -1 || size == 0) {
emptyCount++;
System.out.println("empty count : " + emptyCount);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
} else {
emptyCount = 0;
printEntry(message.getEntries());
}
connector.ack(batchId); // 提交确认
// connector.rollback(batchId); // 处理失败, 回滚数据
}
System.out.println("empty too many times, exit");
} finally {
connector.disconnect();
}
}

private static void printEntry(List<CanalEntry.Entry> entrys) {
for (CanalEntry.Entry entry : entrys) {
if (entry.getEntryType() == CanalEntry.EntryType.TRANSACTIONBEGIN || entry.getEntryType() == CanalEntry.EntryType.TRANSACTIONEND) {
continue;
}

CanalEntry.RowChange rowChage = null;
try {
rowChage = CanalEntry.RowChange.parseFrom(entry.getStoreValue());
} catch (Exception e) {
throw new RuntimeException("ERROR ## parser of eromanga-event has an error , data:" + entry.toString(),
e);
}

CanalEntry.EventType eventType = rowChage.getEventType();
System.out.println(String.format("================> binlog[%s:%s] , name[%s,%s] , eventType : %s",
entry.getHeader().getLogfileName(), entry.getHeader().getLogfileOffset(),
entry.getHeader().getSchemaName(), entry.getHeader().getTableName(),
eventType));
for (CanalEntry.RowData rowData : rowChage.getRowDatasList()) {
if (eventType == CanalEntry.EventType.DELETE) {
printColumn(rowData.getBeforeColumnsList());
} else if (eventType == CanalEntry.EventType.INSERT) {
printColumn(rowData.getAfterColumnsList());
} else {
System.out.println("-------> before");
printColumn(rowData.getBeforeColumnsList());
System.out.println("-------> after");
printColumn(rowData.getAfterColumnsList());
}
}
}
}

private static void printColumn(List<CanalEntry.Column> columns) {
for (CanalEntry.Column column : columns) {
System.out.println(column.getName() + " : " + column.getValue() + " update=" + column.getUpdated());
}
}

}

下载请进：项目DEMO

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