bloom

package
Version: v1.2.1 Latest Latest
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Published: Sep 14, 2021 License: MIT Imports: 4 Imported by: 1

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Constants

This section is empty.

Variables

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var ErrTooLargeOffset = errors.New("too large offset")

ErrTooLargeOffset indicates the offset is too large in bitset.

Functions

This section is empty.

Types

type Filter added in v1.1.5

type Filter struct {
	// contains filtered or unexported fields
}

A Filter is a bloom filter.

func New

func New(store *redis.Redis, key string, bits uint) *Filter

New create a Filter, store is the backed redis, key is the key for the bloom filter, bits is how many bits will be used, maps is how many hashes for each addition. best practices: elements - means how many actual elements when maps = 14, formula: 0.7*(bits/maps), bits = 20*elements, the error rate is 0.000067 < 1e-4 for detailed error rate table, see http://pages.cs.wisc.edu/~cao/papers/summary-cache/node8.html

func (*Filter) Add added in v1.1.5

func (f *Filter) Add(data []byte) error

Add adds data into f.

func (*Filter) Exists added in v1.1.5

func (f *Filter) Exists(data []byte) (bool, error)

Exists checks if data is in f.

Source Files

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