How to generate unique id's, without knowing other id's?

Asked Apr 22 '18 at 02:29

Active Apr 22 '18 at 02:29

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I'm implementing messages on an application (not realtime messages), and I have all the sending and receiving set up, but I'll make things a lot easier if I could generate unique id's for the messages before sending them to the server.

So because the id is generated before reaching the server, I can't know the other id's in order to make a new one. I could use a random string or something, of course the problem is that it's possible that sometime one of the id's repeats. But how do I make sure that that is very unlikely and it's not a gigantic string.

asked Apr 22 '18 at 02:29

Fransebas

you can add user_id and chatroom_id and time in your generated uniq string.. – Phd. Burak Öztürk Apr 22 '18 at 02:31
you can use a GUID. https://en.wikipedia.org/wiki/Universally_unique_identifier – jdigital Apr 22 '18 at 02:31
[Universally Unique Identifier](https://en.wikipedia.org/wiki/Universally_unique_identifier) – Sergey Kalinichenko Apr 22 '18 at 02:31
Or ... just prefix your "locally" unique id strings with a different string; e.g. "S" for server and "C" for client. – Stephen C Apr 22 '18 at 02:37
The linked duplicate solves a version of your problem with additional constraints on the solution; e.g. no local persistence. But the solutions are practical, and should also work for you. – Stephen C Apr 22 '18 at 02:49
Wow thanks I found want I wanted, and I see that my question is a duplicate, what do I do? do I delete the question? – Fransebas Apr 22 '18 at 03:02
You can delete it if you want. Or just leave it. – Stephen C Apr 22 '18 at 03:12

How to generate unique id's, without knowing other id's?

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