Package org.springframework.data.redis.connection

Interface RedisHyperLogLogCommands

All Known Subinterfaces:

DefaultedRedisClusterConnection, DefaultedRedisConnection, RedisClusterConnection, RedisCommands, RedisConnection, RedisConnectionUtils.RedisConnectionProxy, StringRedisConnection

All Known Implementing Classes:

AbstractRedisConnection, DefaultStringRedisConnection, JedisClusterConnection, JedisConnection, LettuceClusterConnection, LettuceConnection

@NullUnmarked
public interface RedisHyperLogLogCommands

HyperLogLog specific commands supported by Redis.

Since:

1.5

Author:

Christoph Strobl, Mark Paluch

See Also:

• RedisCommands

Method Summary

Modifier and Type	Method	Description
Long	pfAdd(byte @NonNull [] key, byte @NonNull [] @NonNull ... values)	Adds given values to the HyperLogLog stored at given key.
Long	pfCount(byte @NonNull [] @NonNull ... keys)	Return the approximated cardinality of the structures observed by the HyperLogLog at key(s).
void	pfMerge(byte @NonNull [] destinationKey, byte @NonNull [] @NonNull ... sourceKeys)	Merge N different HyperLogLogs at sourceKeys into a single destinationKey.

Method Details

pfAdd

Long pfAdd(byte @NonNull [] key,
 byte @NonNull [] @NonNull ... values)

Adds given values to the HyperLogLog stored at given key.

Parameters:

key - must not be null.

values - must not be null.

Returns:

null when used in pipeline / transaction.

See Also:

• Redis Documentation: PFADD

pfCount

Long pfCount(byte @NonNull [] @NonNull ... keys)

Return the approximated cardinality of the structures observed by the HyperLogLog at key(s).

Parameters:

keys - must not be null.

Returns:

null when used in pipeline / transaction.

See Also:

• Redis Documentation: PFCOUNT

pfMerge

void pfMerge(byte @NonNull [] destinationKey,
 byte @NonNull [] @NonNull ... sourceKeys)

Merge N different HyperLogLogs at sourceKeys into a single destinationKey.

Parameters:

destinationKey - must not be null.

sourceKeys - must not be null.

See Also:

• Redis Documentation: PFMERGE