Quick ordered 64-bit ID generator, single thread only, can generate hundreds of millions (~276M) IDs per second.
Consist of 2 segments:
- time/second segment (32 bit, offsetted to 2021-01-01)
- counter segment (32 bit, reset to 0 every second)
warning: this is not for multi-node/distributed use case, since there's no identity segment, so it may duplicate if generated from >1 server. For distributed use case, use lexid instead of this library.
cpu: AMD Ryzen 3 3100 4-Core Processor
BenchmarkShortuuid-8 118908 8572 ns/op
BenchmarkKsuid-8 760924 1493 ns/op
BenchmarkNanoid-8 759548 1485 ns/op
BenchmarkUuid-8 935152 1304 ns/op
BenchmarkTime-8 1690483 720.0 ns/op
BenchmarkSnowflake-8 4911249 244.7 ns/op
BenchmarkLexIdNano-8 8483720 138.8 ns/op
BenchmarkLexIdNoSep-8 10396551 116.3 ns/op
BenchmarkLexIdNoLex-8 10590300 115.1 ns/op
BenchmarkLexId-8 9991906 114.9 ns/op
BenchmarkXid-8 13754178 86.02 ns/op
BenchmarkId64-8 276799974 4.362 ns/op <--import "github.com/kokizzu/id64"
func main() {
id := id64.ID()
// or object-oriented version (eg. when you need different generator per thread/table)
gen := id64.Generator{}
id = gen.ID()
u64 := uint64(id) // get uint64 value
// 78224544304726017
// can also use: gen.UID() to get uint64 value directly
t := id.Time() // get time.Time of that id
// 2021-07-31 02:11:11 +0700 WIB
i32 := id.Counter() // get counter of that id
// 1
s := id.String() // string representation (base64-like encoding)
// 3KuBw----0
// can also use: gen.SID() to get string value directly
i := id64.FromStr(s)
// 78224544304726017
}These IDs generated with delay of 100ms (left column is the string representation, right column is the uint64 value)
string uint64
3Kv3F----0 78228345350782977
3Kv3F----1 78228345350782978
3Kv3F----2 78228345350782979
3Kv3F----3 78228345350782980
3Kv3J----0 78228349645750273
3Kv3J----1 78228349645750274
3Kv3J----2 78228349645750275
3Kv3J----3 78228349645750276
3Kv3J----4 78228349645750277
3Kv3J----5 78228349645750278
3Kv3J----6 78228349645750279
3Kv3J----7 78228349645750280- can be duplicate if your processor can increment faster than 4.2 billion times per second
- might overflow at 2156-07-28 02:08:00 UTC
- it might not ordered/sorted/duplicate if you change your system time to earlier time
lexid - if you need distributed ID (have identity segment)