com.hazelcast.cardinality.impl.hyperloglog.impl

Interface HyperLogLogEncoder

All Superinterfaces:

DataSerializable, IdentifiedDataSerializable

All Known Implementing Classes:

DenseHyperLogLogEncoder, SparseHyperLogLogEncoder

public interface HyperLogLogEncoder
extends IdentifiedDataSerializable

Method Summary

Modifier and Type	Method and Description
boolean	add(long hash) Aggregates the hash value in the HyperLogLog registers, and returns a hint if the operation migth have affected the cardinality, it is just a hint, and it relies to the respective implementation.
long	estimate() Computes a new estimate for the current status of the registers.
com.hazelcast.cardinality.impl.hyperloglog.impl.HyperLogLogEncoding	getEncodingType() Returns the encoding type of this instance; see: HyperLogLogEncoding
int	getMemoryFootprint() Returns the size in memory occupied (in bytes) for this implementation of HyperLogLog.

Methods inherited from interface com.hazelcast.nio.serialization.IdentifiedDataSerializable

getFactoryId, getId

Methods inherited from interface com.hazelcast.nio.serialization.DataSerializable

readData, writeData

Method Detail

estimate

long estimate()

Computes a new estimate for the current status of the registers.

Returns:

a cardinality estimation.

add

boolean add(long hash)

Aggregates the hash value in the HyperLogLog registers, and returns a hint if the operation migth have affected the cardinality, it is just a hint, and it relies to the respective implementation.

Parameters:

hash - the value to aggregate

Returns:

boolean hint, if the latest operation might have affected the cardinality.

getMemoryFootprint

int getMemoryFootprint()

Returns the size in memory occupied (in bytes) for this implementation of HyperLogLog.

Returns:

the size in memory.

getEncodingType

com.hazelcast.cardinality.impl.hyperloglog.impl.HyperLogLogEncoding getEncodingType()

Returns the encoding type of this instance; see: HyperLogLogEncoding

Returns:

HyperLogLogEncoding