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Application variables.

I am writing a little chat program using ASP and am thinking about using an Application variable to store all of the messages. I will restrict the number of lines of text to the last ten only.

Is there any server performance issue I should be aware of that would make this a silly idea. If this is the case then can you please suggest an alternative approach.

Thanks for the help

Richard.H

The only server performance issue with Application variables that I think sometimes is that when you write to an App variable you need to lock it so access to it by multiple processes becomes serial. Other than this I have used app variables in a bunch of asp applications... never had ne great problem with performance.

application variable re the best for chats...
all other possibilities i can think of have more performance issues...

regards,

ASPGuru

ASKER

Thanks for the comments guys. You mentioned the fact that you need to Lock the application variable so that requests become serial, how is that achieved.

Thanks again for the advice.

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here's a function for adding lines to the appl. obj. and also handles the locking....

note, that this is faster, than the solution you graded in the other Q, so i suggest you use this...

<%
sub addMessage(message)
dim buffer
buffer = Application("theChat")
if buffer<>"" then buffer = buffer & vbCrLf
buffer = buffer & message
dim p,n
n = 0 : p = -1
do while n<10 and p<>0 'take just the last 10 lines
p = InStrRev(buffer,vbCrLf,p)
if p<>0 then n = n + 1
loop
if p<>0 then buffer = mid(buffer,p+2)
Application.lock
Application("theChat") = buffer
Application.unlock
end sub

addMessage "test1"
addMessage "test2"
addMessage "test3"
addMessage "test4"
addMessage "test5"
addMessage "test6"
addMessage "test7"
addMessage "test8"
addMessage "test9"
addMessage "test10"
addMessage "test11"
addMessage "test12"
addMessage "test13"
addMessage "test14"
addMessage "test15"
Response.Write "<pre>" & Application("theChat") & "</pre>"
%>

Excellent article on 15Seconds.com regarding the use of the Application Object.

Using the Application Object to Improve Performance
http://www.15seconds.com/Issue/010511.htm

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thanks!
amp
community support moderator

1/27

ASKER

Sorry for the delay in crediting.
Thanks for the help.
Problem now solved.

Richard