bloomfilter

bloomfilter

Overview

Yet another Bloomfilter implementation in Go, compatible with Java's Guava library. This library borrows how Java's Guava libraray implements Bloomfilter hashing strategies to achieve the serialization compatibility.

Installing

First pull the latest version of the library:

go get github.com/OldPanda/bloomfilter

Then import the this library in your code:

import "github.com/OldPanda/bloomfilter"

Usage Examples

Basic Usage

package main

import (
	"fmt"

	"github.com/OldPanda/bloomfilter"
)

func main() {
	// create bloomfilter with expected insertion=500, error rate=0.01
	bf, _ := bloomfilter.NewBloomFilter(500, 0.01)
	// add number 0~199 into bloomfilter
	for i := 0; i < 200; i++ {
		bf.Put(i)
	}

	// check if number 100 and 200 are in bloomfilter
	fmt.Println(bf.MightContain(100))
	fmt.Println(bf.MightContain(200))
}

Serialization

package main

import "github.com/OldPanda/bloomfilter"

func main() {
	// expected insertion=500, error rate=0.01
	bf, _ := bloomfilter.NewBloomFilter(500, 0.01)
	// add 0~199 into bloomfilter
	for i := 0; i < 200; i++ {
		bf.Put(i)
	}

	// serialize bloomfilter to byte array
	bytes := bf.ToBytes()
	// handling the bytes ...
}

Deserialization

package main

import (
	"fmt"

	"github.com/OldPanda/bloomfilter"
)

func main() {
	// create bloomfilter from byte array
	bf, _ := bloomfilter.FromBytes(bytes)
	// check whether number 100 is in bloomfilter
	fmt.Println(bf.MightContain(100))
}

Benchmark

The benchmark testing runs on element insertion and query separately.

» go test -bench . -benchmem ./...
# github.com/OldPanda/bloomfilter.test
goos: darwin
goarch: amd64
pkg: github.com/OldPanda/bloomfilter
cpu: Intel(R) Core(TM) i7-4870HQ CPU @ 2.50GHz
BenchmarkBloomfilterInsertion-8                  4923142               387.1 ns/op            17 B/op          1 allocs/op
BenchmarkBloomfilterQuery-8                      4678299               259.6 ns/op            15 B/op          1 allocs/op
BenchmarkBloomfilterDeserialization-8             162871              7110 ns/op           13200 B/op         52 allocs/op
PASS
ok      github.com/OldPanda/bloomfilter 4.880s