I would say implement a pattern like the Observer which watches for any
changes to the data list. If any changes occur it immediatly updates the
internal list. So you will always have an updated list (no matter what) and
it is done automatically behind the scenes...
cheers,
Amar..
-----Original Message-----
From: Greg Reddin [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, April 17, 2001 9:46 AM
To: [EMAIL PROTECTED]
Subject: RE: how to cache lists?
You could store the data in Application context as you've stated, but
provide a
mechanism for that data to be refreshed (either automatically or manually)
without restarting the server. I haven't implemented this at all, but it
seems
possible. I've considered using some sort of date/time stamp, a boolean
flag,
or some other means to make the data automatically refresh. Otherwise you'd
have to create some admin actions that would manually be invoked to refresh
the
data.
-----Original Message-----
From: [EMAIL PROTECTED]
Sent: Tuesday, April 17, 2001 8:34 AM
To: [EMAIL PROTECTED]
Subject: RE: how to cache lists?
Alex, It is a good idea from a developers point of view. But when U say this
to an IT manager and also tell him that U have to restart the webserver when
ever new data is added, he/she will not allow U to do that. I faced the same
situation but gave up on the idea of caching the data at application level.
Thanks,
Uday.
-----Original Message-----
From: Alex Colic [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, April 17, 2001 8:15 AM
To: Struts
Subject: how to cache lists?
Hi,
Lets say you have a web app that runs over a number of web pages in a wizard
fashion. On each one of these pages you need to present the user with a
select box holding lists. e.g. locations, cities, etc. This data is read
from a database and rarely changes.
How would you cache these lists so that as each user access this site they
do not need to have this info downloaded again?
I was thinking in the init() of my ActionServlet to access the database and
get these lists then place them in the session with Application scope. I
think this would allow each user to access the data without reaccessing the
database.
Any comments or suggestions are appreciated.
Regards
Alex
