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Limiting the # of object instances
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Remas Wojciechowski
Hi!

my Win service (written in .NET) waits for incoming files, processes them
and then instantiates a COM object to feed the data into an external
application. When many files come in at the same time, the service won't
hesitate to create 10+ new processes/instances of the COM object. After the
n'th instance, the app errors out. Momentarily, according to suggestions in
the docs, I let the GC dispose of the objects at its discretion. My guess is
that it's the number of instances that causes the problems. The question is:
how can I limit of instances my service can create?

There are 2 options I could think of:
- serialize the file watch--process only one file at a time
- explicitly call .Dispose()

but they implicitly limit the # to 1. How about 5?

Thanks
Remas
http://www.aspalliance.com/remas
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Brian Bilbro (VIP)
Just keep a static variable the counts the number if instances you have =
open:

private static int _NumberInstances =3D 0;

Then before you fire of an new instance check it against =
_NumberInstances. Increment and decrement the counter where =
appropriate. I'm working an on application where we run reports in the =
Report Service (.NET Windows Service). We use this technique to limit =
the number of concurrently running reports.

HTHs,
Brian

----- Original Message -----
From: "Remas Wojciechowski" <Click here to reveal e-mail address>
To: Click here to reveal e-mail address
Sent: Mon, 29 Jul 2002 11:02:17 +0200
Subject: Limiting the # of object instances
[Original message clipped]
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