Creating a unique timestamp in Java

Question

I need to create a timestamp (in milliseconds) in Java that is guaranteed to be unique in that particular VM-instance. I.e. need some way to throttle the throughput of System.cu

Answer 1

While searching for a solution I came across ULIB (Universally Unique Lexicographically Sortable Identifier) https://github.com/huxi/sulky/tree/master/sulky-ulid/

It's not a long, but shorter then UUID.

A ULID:

• Is compatible with UUID/GUID's 1.21e+24 unique ULIDs per millisecond (1,208,925,819,614,629,174,706,176 to be exact)
• Lexicographically sortable
• Canonically encoded as a 26 character string, as opposed to the 36 character UUID
• Uses Crockford's base32 for better efficiency and readability (5 bits per character)
• Case insensitive
• No special characters (URL safe)