Redis与MySQL数据双写一致性工程落地案例
com.alibaba.otter
canal.client
1.1.0
com.google.guava
guava
23.0
org.springframework.boot
spring-boot-starter-web
org.springframework.boot
spring-boot-starter-actuator
org.springframework.boot
spring-boot-starter-data-redis
org.apache.commons
commons-pool2
redis.clients
jedis
3.1.0
org.springframework.boot
spring-boot-starter-aop
org.redisson
redisson
3.13.4
mysql
mysql-connector-java
5.1.47
com.alibaba
druid-spring-boot-starter
1.1.10
com.alibaba
druid
${druid.version}
com.alibaba
druid
${druid.version}
org.mybatis.spring.boot
mybatis-spring-boot-starter
${mybatis.spring.boot.version}
org.springframework.boot
spring-boot-starter-amqp
junit
junit
${junit.version}
org.springframework.boot
spring-boot-devtools
runtime
true
org.springframework.boot
spring-boot-starter-test
test
log4j
log4j
${log4j.version}
org.projectlombok
lombok
${lombok.version}
true
cn.hutool
hutool-all
RELEASE
compile
com.alibaba
fastjson
1.2.73
org.springframework.boot
spring-boot-maven-plugin
3.写YML server.port=5555
4.业务类 RedisUtils，如下：
package com.zzyy.study.util;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;
/**
-
@auther zzyy
-
@create 2020-10-11 14:33
*/
public class RedisUtils
{
public static JedisPool jedisPool;
static {
JedisPoolConfig jedisPoolConfig=new JedisPoolConfig();
jedisPoolConfig.setMaxTotal(20);
jedisPoolConfig.setMaxIdle(10);
jedisPool=new JedisPool(jedisPoolConfig,“192.168.111.147”,6379);
}
public static Jedis getJedis() throws Exception {
if(null!=jedisPool){
return jedisPool.getResource();
}
throw new Exception(“Jedispool is not ok”);
}
/*public static void main(String[] args) throws Exception
{
try(Jedis jedis = RedisUtils.getJedis())
{
System.out.println(jedis);
jedis.set(“k1”,“xxx2”);
String result = jedis.get(“k1”);
System.out.println("-----result: "+result);
System.out.println(RedisUtils.jedisPool.getNumActive());//1
}catch (Exception e){
e.printStackTrace();
}
}*/
}
RedisCanalClientExample，如下：
package com.zzyy.study.t1;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.otter.canal.client.CanalConnector;
import com.alibaba.otter.canal.client.CanalConnectors;
import com.alibaba.otter.canal.protocol.CanalEntry.*;
import com.alibaba.otter.canal.protocol.Message;
import com.zzyy.study.util.RedisUtils;
import org.springframework.beans.factory.annotation.Autowired;
import redis.clients.jedis.Jedis;
import java.net.InetSocketAddress;
import java.util.List;
import java.util.concurrent.TimeUnit;
/**
-
@auther zzyy
-
@create 2020-11-11 17:13
*/
public class RedisCanalClientExample
{
public static final Integer _60SECONDS = 60;
public static void main(String args[]) {
// 创建链接canal服务端
CanalConnector connector = CanalConnectors.newSingleConnector(new InetSocketAddress(“192.168.111.147”,
11111), “example”, “”, “”);
int batchSize = 1000;
int emptyCount = 0;
try {
connector.connect();
//connector.subscribe(“.\…”);
connector.subscribe(“db2020.t_user”);
connector.rollback();
int totalEmptyCount = 10 * _60SECONDS;
while (emptyCount < totalEmptyCount) {
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++;
try { TimeUnit.SECONDS.sleep(1); } 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 entrys) {
for (Entry entry : entrys) {
if (entry.getEntryType() == EntryType.TRANSACTIONBEGIN || entry.getEntryType() == EntryType.TRANSACTIONEND) {
continue;
}
RowChange rowChage = null;
try {
rowChage = RowChange.parseFrom(entry.getStoreValue());
} catch (Exception e) {
throw new RuntimeException(“ERROR ## parser of eromanga-event has an error,data:” + entry.toString(),e);
}
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 (RowData rowData : rowChage.getRowDatasList()) {
if (eventType == EventType.INSERT) {
redisInsert(rowData.getAfterColumnsList());
} else if (eventType == EventType.DELETE) {
redisDelete(rowData.getBeforeColumnsList());
} else {//EventType.UPDATE
redisUpdate(rowData.getAfterColumnsList());
}
}
}
}
private static void redisInsert(List columns)
{
JSONObject jsonObject = new JSONObject();
for (Column column : columns)
{
System.out.println(column.getName() + " : " + column.getValue() + " update=" + column.getUpdated());
jsonObject.put(column.getName(),column.getValue());
}
if(columns.size() > 0)
{
try(Jedis jedis = RedisUtils.getJedis())
{
jedis.set(columns.get(0).getValue(),jsonObject.toJSONString());
}catch (Exception e){
e.printStackTrace();
}
}