Java服務使用Redis實現分布式全局唯一標識

此處以SpringBoot為例,示范如何使用Redis構造全局唯一標識.

1. RedisTemplate配置

spring.redis.database = 0
spring.redis.host = **
spring.redis.port = 6379
spring.redis.password = **
spring.redis.lettuce.pool.max-wait = 1000ms

以上配置,參照實際情況進行設置.,

2.Java服務中Redis配置

@Repository
@Slf4j
public class RedisCounterRepository {

    private final DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyyMMdd");

    private RedisTemplate<String, Object> redisTemplate;

    @Autowired
    public RedisCounterRepository(RedisTemplate<String, Object> redisTemplate) {
        this.redisTemplate = redisTemplate;
    }

    // 根據獲取的自增數據,添加日期標識構造分布式全局唯一標識
    private String getNumFromRedis(String changeNumPrefix) {
        String dateStr = LocalDate.now().format(dateTimeFormatter);
        Long value = incrementNum(changeNumPrefix + dateStr);
        return dateStr + StringUtils.leftPad(String.valueOf(value), 4, '0');
    }

    // 從redis中獲取自增數據(redis保證自增是原子操作)
    private long incrementNum(String key) {

        RedisConnectionFactory factory = redisTemplate.getConnectionFactory();
        if (null == factory) {
            log.error("Unable to connect to redis.");
            throw new UserException(AppStatus.INTERNAL_SERVER_ERROR);
        }
        RedisAtomicLong redisAtomicLong = new RedisAtomicLong(key, factory);
        long increment = redisAtomicLong.incrementAndGet();
        if (1 == increment) {
            // 如果數據是初次設置,需要設置超時時間
            redisAtomicLong.expire(1, TimeUnit.DAYS);
        }
        return increment;
    }

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