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

public interface RedisHyperLogLogCommands

HyperLogLog specific commands supported by Redis.

Since:

1.5

Author:

Christoph Strobl, Mark Paluch

Method Summary

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

Method Detail

pfAdd

@Nullable
Long pfAdd(byte[] key,
                     byte[]... 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

@Nullable
Long pfCount(byte[]... 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[] destinationKey,
             byte[]... 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