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Re: algorithm to get xml update

From: Peter Flynn <peter.nosp@-.--------.-->
To: NULL
Date: 6/11/2008 11:00:00 PM

Elliot wrote:
> I propose to write a C# program to get the content of a xml file.
> However, that file may be modified after 10 seconds, 10 minutes or 10
> hours.
> I think the algorithm of getting the content every 10 seconds to check
> whether it was chaged is too stupid, assuming there are 50,000 users
> running the program(cause a heavy workload for the web server, worse
> still it is unable to handle).
> Certainly, less than 10-second delay is acceptable if real-time is
> impossible.
> Please advise me a better algorithm.
> Any idea would be appreciated.

Do you need to know *what* was changed, or merely the fact that it *was*
changed?

If it's only the latter, and the file is a disk file, then a simple
script to monitor the file status or last-written date would be much
faster than a program that read and re-read the whole file.

///Peter

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