CODEWITHSUNDEEP
javaservletsrequestguiduniqueidentifier
LHA
LHA

Reputation: 9655

Algorithm to generate global (Application scoped) unique request id based on HttpServletRequest?

I have issue with generating global unique request id based on HttpServletRequest. I need to make sure the generated id is unique in Application scope. Java UUID Or Random does not guarantee what I want although the chance for duplicate is very low.

Anyone has any ideas? Thanks,

Upvotes: 0

Views: 649

Answers (2)

BalusC
BalusC

Reputation: 1109635

Random definitely doesn't guarantee uniqueness, but UUID definitely does that. So your concern makes no sense. Even if you've hardware capable of serving a billion HTTP requests per second, you'd only after 100 years reach 50% chance on a duplicate.

If you have really really a hard head in this, just check in synchronized block if the application scope contains already such a key and if so, then just generate another one. And so on. This way you can even use Random.

See also:

Upvotes: 1

Camilo Diaz
Camilo Diaz

Reputation: 21

If you have to be absolutely sure you don`t make a duplicate you could use an auto increment database id, but given the incredibly low chances of duplicates using UUID i dont think it justifies the cost.

Upvotes: 1

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