Package org.redisson.api

Interface RBloomFilter<T>

Type Parameters:

T - - type of object

All Superinterfaces:

RExpirable, RExpirableAsync, RObject, RObjectAsync

All Known Implementing Classes:

RedissonBloomFilter

public interface RBloomFilter<T>
extends RExpirable

Distributed implementation of Bloom filter based on Highway 128-bit hash.

Author:

Nikita Koksharov

Method Summary

Modifier and Type	Method	Description
boolean	add(T object)	Adds element
boolean	contains(T object)	Check for element present
long	count()	Calculates probabilistic number of elements already added to Bloom filter.
long	getExpectedInsertions()	Returns expected amount of insertions per element.
double	getFalseProbability()	Returns false probability of element presence.
int	getHashIterations()	Returns hash iterations amount used per element.
long	getSize()	Returns number of bits in Redis memory required by this instance
boolean	tryInit(long expectedInsertions, double falseProbability)	Initializes Bloom filter params (size and hashIterations) calculated from expectedInsertions and falseProbability Stores config to Redis server.

Methods inherited from interface org.redisson.api.RExpirable

clearExpire, expire, expire, expireAt, expireAt, remainTimeToLive

Methods inherited from interface org.redisson.api.RExpirableAsync

clearExpireAsync, expireAsync, expireAsync, expireAtAsync, expireAtAsync, remainTimeToLiveAsync

Methods inherited from interface org.redisson.api.RObject

addListener, copy, delete, dump, getCodec, getIdleTime, getName, isExists, migrate, move, removeListener, rename, renamenx, restore, restore, restoreAndReplace, restoreAndReplace, sizeInMemory, touch, unlink

Methods inherited from interface org.redisson.api.RObjectAsync

addListenerAsync, copyAsync, deleteAsync, dumpAsync, getIdleTimeAsync, isExistsAsync, migrateAsync, moveAsync, removeListenerAsync, renameAsync, renamenxAsync, restoreAndReplaceAsync, restoreAndReplaceAsync, restoreAsync, restoreAsync, sizeInMemoryAsync, touchAsync, unlinkAsync

Method Detail

add

boolean add(T object)

Adds element

Parameters:

object - - element to add

Returns:

true if element has been added successfully false if element is already present

contains

boolean contains(T object)

Check for element present

Parameters:

object - - element

Returns:

true if element is present false if element is not present

tryInit

boolean tryInit(long expectedInsertions,
                double falseProbability)

Initializes Bloom filter params (size and hashIterations) calculated from expectedInsertions and falseProbability Stores config to Redis server.

Parameters:

expectedInsertions - - expected amount of insertions per element

falseProbability - - expected false probability

Returns:

true if Bloom filter initialized false if Bloom filter already has been initialized

getExpectedInsertions

long getExpectedInsertions()

Returns expected amount of insertions per element. Calculated during bloom filter initialization.

Returns:

expected amount of insertions per element

getFalseProbability

double getFalseProbability()

Returns false probability of element presence. Calculated during bloom filter initialization.

Returns:

false probability of element presence

getSize

long getSize()

Returns number of bits in Redis memory required by this instance

Returns:

number of bits

getHashIterations

int getHashIterations()

Returns hash iterations amount used per element. Calculated during bloom filter initialization.

Returns:

hash iterations amount

count

long count()

Calculates probabilistic number of elements already added to Bloom filter.

Returns:

probabilistic number of elements