|
James
:
Thanks
for sharing the ideas. As this is getting interesting, I would like to explain
what I do, and the problems that I have in more detail :
I have
a Singleton object that keeps several hashtables (with
Spanish/Chinese/Japanese/French/Germany texts and key strings for these texts).
These hashtables will be populated a start-up servlet when the webapp starts.
JSP pages retrieves the locale texts using keys, so that the web system is
translated in user's preferred locale.
Let me
take a simplified version, I have one WebSphere server with three webapp clones
in load balance. My server never stops, so when translators need modify these
locale texts, I need to reload the corresponding hashtables.
The
thing is, on a webapp based system, the translator can trigger a reload, and
this reload happens in only one of the clones, and the other two clones are not
refreshed. Users hitting these two clones are still getting old
translation.
In a
word, in my system, the cached data is semi-static, and need to be reloaded on
demand.
Right
now we are working on possible design approaches to fix this, and we figure one
of the followign may do the job:
(1) Use a database flag and let the Singleton object keeps on
polling this flag. Once flipped, the object will refresh the
content.
(2)
...
But I
assume this should be a common problem to any system with multiple webapps in
load balancing, and there should be a systematic solution...Any suggestions are
welcome.
Thanks
Jeff
We have a servlet that gathers the data about the caches and serializes
that info. One servlet connects to the other servlets to get that info and
consolidates it.
James Stauffer
James:
Thanks for the post. I am also interested in caching objects and right
now I am having problems in refreshing them - I have three WebSphere sites,
each one of them has three webapp clones.
How
do you manage the caches across sites?
Thanks
Jeff
We have our own internally developed object cache. It uses a hard
cache (can't be GC'ed) extended by a soft reference cache. It also has a
cache manager servlet and another servlet to manage the caches across
machines. It mostly only caches objects of the
following:
public interface CacheAble {
public int
getID();
public String getClassName();
public String getDescriptor();
}
If you are interested I can probably give more design
details.
James Stauffer
We're have a home-grown Java application and would like to introduce
some kind of app-level cache manager. I'm interested if someone has
made anything like that -- shareware/custom packages, a study about the
size of objects in memory, anything like that.
All suggestions welcome. Thanks!
Greg ---
You are currently subscribed to
jdjlist as: [EMAIL PROTECTED]
To unsubscribe send a blank email
to
[EMAIL PROTECTED]
http://www.sys-con.com/fusetalk
---
You are currently subscribed to jdjlist as: [EMAIL PROTECTED]
To
unsubscribe send a blank email to
[EMAIL PROTECTED]
http://www.sys-con.com/fusetalk
---
You are currently subscribed to jdjlist as:
[EMAIL PROTECTED]
To unsubscribe send a blank email to
[EMAIL PROTECTED]
http://www.sys-con.com/fusetalk
---
You are currently subscribed to jdjlist as: [EMAIL PROTECTED]
To
unsubscribe send a blank email to
[EMAIL PROTECTED]
http://www.sys-con.com/fusetalk
---
You are currently subscribed to jdjlist as: [EMAIL PROTECTED]
To unsubscribe send a blank email to [EMAIL PROTECTED]
http://www.sys-con.com/fusetalk
| 