Redis適用於高並發的遞增、遞減功能

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遞增指令:incr(預設從0開始)

遞減指令:decr(預設從0開始,遞減會出現負數,這點跟memcache不一樣,mc到0)

如下:

附上shardedJedisPool和JedisCluster的兩種實現方式:

shardedJedisPool:

@Override    public Long decr(String key) {        ShardedJedis jedis = null;        Long result = 0l;        try {            jedis =  shardedJedisPool.getResource();            result = jedis.decr(key);        } catch (Exception e) {            log.error("redis decr error and key = " + key, e);        }        return result;    }    @Override    public Long incr(String key) {        ShardedJedis jedis = null;        Long result = 0l;        try {            jedis =  shardedJedisPool.getResource();            result = jedis.incr(key);        } catch (Exception e) {            log.error("redis incr error and key = " + key, e);        }        return result;    }

JedisCluster:

@Override    public Long decr(String key) {        Long result = 0l;        try {            result = jedisCluster.decr(key);        } catch (Exception e) {            log.error("jedisCluster decr error and key = " + key, e);        }        return result;    }    @Override    public Long incr(String key) {        Long result = 0l;        try {            result = jedisCluster.incr(key);        } catch (Exception e) {            log.error("jedisCluster incr error and key = " + key, e);        }        return result;    }

適用情境:

  高並發產生訂單號,秒殺類的商務邏輯等。。

Redis適用於高並發的遞增、遞減功能

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