Spring Boot 集成canal、RocketMq同步异构数据

一、canal环境搭建

 1、下载canal服务至指定目录，解压压缩文件

 wget -P  ./   https://github.com/alibaba/canal/releases/download/canal-1.1.5/canal.deployer-1.1.5.tar.gz

 tar  -zxf   canal.deployer-1.1.5.tar.gz

 2、修改配置文件

    修改canal.properties

vim   canal.properties

canal.id = 40
canal.ip = 192.168.81.200

  修改instance.properties  

vim  example/instance.properties 

canal.instance.master.address=192.168.81.200:3306

3、mysql 数据库配置修改

vim my.cnf

port = 3306
server-id =1
log-bin = mysql-bin
binlog_format=ROW

4、分别启动mysql、canal、rocketmq服务 

二、canal 整合 Spring Boot

1、加入依赖

   top.javatool
   canal-spring-boot-starter
   1.2.1-RELEASE

 2、解析canal增量更新的数据

@Component
public class CanalHelper implements CommandLineRunner {

    private static volatile CanalConnector connector;

    private static final Logger LOGGER = LoggerFactory.getLogger(CanalHelper.class);

    @Autowired
    private RocketMQTemplate rocketMqTemplate;

    @Override
    public void run(String... args) throws Exception {
        readChange();
    }


    /***
     * 遍历侦听数据变化
     * @throws Exception
     */
    private void readChange() throws Exception {
        LOGGER.info("CanalHelper---------------------开始监听数据----------------");
        int batchSize = 1000;
        while (true) {
            Thread.sleep(5000);
            Message message = getCanalConnector().getWithoutAck(batchSize);
            ///LOGGER.info("监控数据变化数据 {} ",message.toString());
            long batchId = message.getId();
            int size = message.getEntries().size();
            if (batchId == -1 || size == 0) {
                Thread.sleep(1000);
            } else {
                ///dataHandle(message.getEntries());
                List entries = message.getEntries();
                printEntry(entries);
            }
            getCanalConnector().ack(batchId);
            ///当队列里面堆积的sql大于一定数值的时候就模拟执行
            // /executeQueueSql();
        }
    }

    /**
     * 解析变化数据
     * @param entries
     */
    private void printEntry(List entries) {
        for (CanalEntry.Entry entry : entries) {
            if (entry.getEntryType() == CanalEntry.EntryType.TRANSACTIONBEGIN || entry.getEntryType() == CanalEntry.EntryType.TRANSACTIONEND) {
                continue;
            }
            CanalEntry.RowChange rowChange;
            try {
                rowChange = 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 = rowChange.getEventType();
            LOGGER.info(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 : rowChange.getRowDatasList()) {
                if (eventType == CanalEntry.EventType.DELETE) {
                    printColumn(rowData.getBeforeColumnsList());
                } else if (eventType == CanalEntry.EventType.INSERT) {
                    printColumn(rowData.getAfterColumnsList());
                } else {
                    LOGGER.info("变化之前数据-------> before");
                    printColumn(rowData.getBeforeColumnsList());
                    LOGGER.info("变化之后数据-------> after");
                    printColumn(rowData.getAfterColumnsList());
                }
            }
        }
    }

    private void printColumn(List columns) {
        JSONObject jsonObject = new JSONObject();
        for (CanalEntry.Column column : columns) {
            ///LOGGER.info(column.getName() + " : " + column.getValue() + "    update=" + column.getUpdated());
            jsonObject.put(column.getName(),column.getValue());
        }
        LOGGER.info("canal监听数据发送至mq {} ",jsonObject.toString());
        String msgBody =jsonObject.toJSONString();
        rocketMqTemplate.sendOneWay(RocketMqConstant.TOPIC_CANAL, MessageBuilder.withPayload(msgBody).build());
    }

    private  static CanalConnector getCanalConnector() {
        if (connector == null) {
            synchronized (CanalHelper.class) {
                if (connector == null) {
                    connector = CanalConnectors.newSingleConnector(new InetSocketAddress("192.168.81.200", 11111), "example", "canal", "canal");
                    connector.connect();
                    connector.subscribe(".*\\..*");
                    connector.rollback();
                }
            }
        }
        // 创建链接
        return connector;
    }

    private void disConnect() {
        if (connector != null) {
            connector.disconnect();
        }
    }
}

3、mq消费增量数据

@Slf4j
@Component
@RocketMQMessageListener(
        topic = RocketMqConstant.TOPIC_CANAL,
        selectorExpression="*",
        consumerGroup = RocketMqConstant.CONSUMER_CANAL_GROUP)
public class CanalMsgListener implements RocketMQListener {
    @Override
    public void onMessage(MessageExt message) {
        byte[] body = message.getBody();
        String msg = new String(body);
        log.info("主题:{} 消费组:{} 接收到消息:{}",RocketMqConstant.TOPIC_CANAL,RocketMqConstant.CONSUMER_CANAL_GROUP, msg);
    }
}

public interface RocketMqConstant {

    String  TOPIC_CANAL ="canal_topic";

    String  CONSUMER_CANAL_GROUP ="canal_consumer";

}