Combined time-GUID

[benasher44]

Combined time-GUID

[Fleshgrinder]

COMBs are not RFC compliant and should not be provided by a library that is. That said, COMBs are of course great for certain use cases, so there is nothing wrong with them per se. Generating them is trivial:

import java.security.SecureRandom
import com.benasher44.uuid.Uuid

fun main() {
    val rnd = SecureRandom.getInstanceStrong().nextLong()
    val now = System.currentTimeMillis()

    println(Uuid(rnd, now))
}

Another thing that might be of interest are semi-sequential IDs.