Is java.rmi.server.UID.toString() not safe? I know it is host-specific,
so prepending a hostname/ip/etc would be easy...
-Jason
Peter Jasko <[EMAIL PROTECTED]>
09/29/00 03:45 AM
Please respond to jBoss
To: jBoss <[EMAIL PROTECTED]>
cc:
Subject: RE: [jBoss-User] container generated primary key for CMP
EntityEJB
The host+pid+time is fine for generating the odd id or two but it isn't
fail-safe. In particular it can run into trouble if your system clock
resets
or if you create 100s or 1000s of beans a second, as most system time
functions only resolve to 1 millisecond.
I prefer the safer high/low pattern.
Peter
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of
[EMAIL PROTECTED]
Sent: Thursday, September 28, 2000 10:00 AM
To: jBoss
Subject: Re: [jBoss-User] container generated primary key for CMP
EntityEJB
On Sep 28, Tom Cook quoth:
> [EMAIL PROTECTED] writes:
> > On Sep 27, Rickard Oberg quoth:
> >
> > For our application where we internally create our primary keys we
aren't
> > using a database feature to do so.
>
> How do you guarantee that they are unique across server instances?
A GUID algorithm that allows for free-form strings that encapsulate the
host generated on, the process space within that host, a serial number
within that process, the time generated and a random number for good
measure. (And before you ask, yes the time link with the random number
seed has been taken into account, but it really exists there just as a
feel good factor.)
The distributed nature of our application requires that our database not
be monolithic in nature and minimize data overlap. I.e. the space of all
object instances spans several physical systems and databases separated
geographically.
C=)
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