How to make the config change effective immediately?

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Michael - 03 Dec 2003 01:19 GMT

I have a question regarding EIF , when the EnterpriseInstrumentation config
file is changed, the effect is immediate, how EIF achieve this? Does that
mean EIF will always read the config file when calling the raise? Or it has
a cached version and use some kind of notification mechanism to notify EIF
to reload whenever a changes on the config file occurs?

The reason I am asking is: I am wondering how to let the app know the config
is changed without reading the config file again and again? My understanding
is that the IO access is slow. In a situation that we use a TraceSwitch in
config file to decide whether or not we should trace, will this repeatedly
IO access cause performance problem?

Thanks;

Michael

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David Keogh [MSFT] - 03 Dec 2003 16:36 GMT

When an instrumented app is loaded, EIF puts a filewatcher on the config
file to be alerted to changes. However, we always maintain an in-memory
lookup of configuration information so that when you call event.raise() it
is an optimized lookup to determine whether to do anything; we don't go
directly to the config file when firing events for performance reasons. We
only re-load the config file when we detect that it has changed, or if the
app is restarted.

David [MSFT]

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| From: "Michael" <michael_chi@sbcglobal.net>
| Subject: How to make the config change effective immediately?
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| Michael

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news.microsoft.com - 05 Dec 2003 17:14 GMT

David,

Sounds exactly what we will do to our config file, we have a service that
will run day in and day out. And we want to be able to change its
settings( such as tracing level) from
a config file without stopping it ( I believe if we use the app.config, th
framework will reset the app domain and reload the program, is that right?),
so use the same approach as EIF should work nicely. Thanks a lot;

Michael

> When an instrumented app is loaded, EIF puts a filewatcher on the config
> file to be alerted to changes. However, we always maintain an in-memory
[quoted text clipped - 41 lines]
> |
> | Michael

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David Keogh [MSFT] - 05 Dec 2003 18:25 GMT

Only ASP.NET web apps auto restart when the web.config file is changed.
Regular EXEs such as Windows Services don't restart, but also won't pickup
config changes until it is restarted. So to have dynamically reloaded
config without restarting the app, you'll need a separate config file.

David [MSFT]

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| From: "news.microsoft.com" <kwongyuchi@hotmail.com>
| References: <OBF85tTuDHA.560@TK2MSFTNGP11.phx.gbl>

<RYKcIvbuDHA.652@cpmsftngxa06.phx.gbl>

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news.microsoft.com - 05 Dec 2003 20:46 GMT

David,

Appreciate your quick response. Just for followup, will Web service behave
the same as web apps? I guess it will. Do you know some MSDN articles I
can refer to further understand what happen when a config file is modified
for each type of projects?

Thanks ;

Michael

Thanks again. Do you have a reference to how the config file works

> Only ASP.NET web apps auto restart when the web.config file is changed.
> Regular EXEs such as Windows Services don't restart, but also won't pickup
[quoted text clipped - 79 lines]
> | > |
> | > | Michael

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Mike Hayton [MS] - 07 Dec 2003 03:08 GMT

Im not sure on the articles question, but WebServices (hosted in AspNet) be
restarted.

The general rule is any AppDomain (whether WebService, WebApp, singeton
.NET Remoting object, etc) that is being hosted in ASP.NET will be
restarted if the ASP.NET detects a change to the web.config or a change in
Bin directory.

Hope this helps.

Mike

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| David,
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| > | > |
| > | > | Michael

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Mayank Thapak - 06 Dec 2004 18:07 GMT

Hello,
Can you please send me a code.
I have a config file. which is placed at another location.
i want to implement the filewatcher on that.
and when ever anybody change it the modified contain reflected.
please do needful for me

Thanks & Regards
Mayank Thapak

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How to make the config change effective immediately?

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