Redis7_13 高阶篇 第四章 Canal实现Redis与Mysql双写一致性

@Component
public class RedisMysqlSyncService {
 
    @Autowired
    private RedisTemplate<String, String> redisTemplate;
 
    @Autowired
    private JdbcTemplate jdbcTemplate;
 
    @Autowired
    private CanalClient canalClient;
 
    // ... 其他代码
 
    // 处理Redis事件
    public void processRedisEvent(RedisEvent event) {
        String key = event.getKey();
        String command = event.getCommand();
        String value = event.getValue();
 
        // 根据不同的命令执行不同的操作
        switch (command) {
            case "set":
                jdbcTemplate.update("REPLACE INTO your_table (id, data) VALUES (?, ?)", key, value);
                break;
            case "del":
                jdbcTemplate.update("DELETE FROM your_table WHERE id = ?", key);
                break;
            // ... 其他命令处理
        }
    }
 
    // 监听Canal变更事件
    public void listenCanalEvent() {
        canalClient.connect();
        canalClient.subscribe("your_canal_filter_rule");
        canalClient.rollback();
        while (true) {
            Message message = canalClient.getWithoutAck(100); // 获取100条数据
            if (message == null) {
                // 没有数据，休眠一会儿
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    Thread.currentThread().interrupt();
                }
            } else {
                // 处理数据
                processCanalEvent(message);
                canalClient.ack(message.getId()); // 确认消息
            }
        }
    }
 
    // 处理Canal事件
    public void processCanalEvent(Message message) {
        for (Entry entry : message.getEntries()) {
            if (EntryType.ROWDATA == entry.getEntryType()) {
                RowChange rowChange = RowChange.parseFrom(entry.getStoreValue());
                EventType eventType = rowChange.getEventType();
                for (RowData rowData : rowChange.getRowDatasList()) {
                    if (eventType == EventType.DELETE) {
                        redisTemplate.delete(rowData.getBeforeColumnsList().get(0).getValue());
                    } else if (eventType == EventType.INSERT || eventType == EventType.UPDATE) {
                        redisTemplate.opsForValue().set(rowData.getAfterColumnsList().get(0).getValue(),
                                rowData.getAfterColumnsList().get(1).getValue());
                    }
                }