Static in WO (was: Refresh)
Static in WO (was: Refresh)
- Subject: Static in WO (was: Refresh)
- From: Florijan Stamenkovic <email@hidden>
- Date: Thu, 1 Mar 2007 03:32:16 +0100
Hi Jerry,
Wow, this concept never really occurred to me. I indeed thought that
static variables ARE shared across applications running in the same
VM. I will have to test this, but supposing it is as you say it is, I
am screwed, because:
I have some code that synchronizes on a statically declared variable
in my SessionWorker class. SessionWorker is a class to which RMI
calls on Session are forwarded to. I use this synchronization to
generate unique numbers that are not keys in the tables I am
generating them in. I can not make keys out of them due to their
specific nature (it is guaranteed that the same table will contain
records with the same values in these fields, although in another
context they are unique). Thus the synchronization. I am aware that
even if my original idea is OK, and this works across WOApp
instances, it would only work on single machine deployment. This
concept starts to melt down.
Any comments or suggestions? Do I have to switch to stored procedures
to accomplish the above???
Singleton... I was so dumb to overlook that.
Many thanks for the info,
Florijan
Hi, Florijan,
The WOApplication class is a singleton for any WebObjects
application. From the first paragraph of the JavaDoc on WOApplication:
The primary role of the WOApplication class is to coordinate the
handling of HTTP requests. Each application must have exactly
one WOApplication object. The application object receives...
Honestly, I've never considered the possibility that a static
variable declared for a class in one application is shared with any
other application using that same class within the same Java
Virtual Machine. I don't think this is true, and if it is, there
are a few things about static variables that I will have to rethink
before this bites me. Whether true or not, the variable wouldn't be
shared between JVM's.
That's why Robert Walker was suggesting scheduling outside the
application.
So... has anyone any information on static variables in a class
shared between separate applications on the JVM if two applications
use that same class?
Regards,
Jerry
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| References: | |
| | >Refresh (From: WIESEN Bruno <email@hidden>) |
| | >Re: Refresh (From: Zak Burke <email@hidden>) |
| | >Re: Refresh (From: Robert Walker <email@hidden>) |
| | >Re: Refresh (From: Florijan Stamenkovic <email@hidden>) |
| | >Re: Refresh (From: "Jerry W. Walker" <email@hidden>) |