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.NET Forum / ASP.NET / General / July 2007Is it possible to schedule a web service?
I have a web service, which needs to run at regular intervals (e.g., once every 2 hours) to create some PDF files for users to download. I can certainly create a web application which lets user click a button and generates the PDF file. But since the PDF files are gonna be the same for all users, so, it does not make sense to waste the server resources. Is it possible to schedule a web service to run at regular intervals? I do not want to use the Windows Task Scheduler, part of the reason is that we do not have full access to our clients' Windows system, and it's cumbersome to get them involved in setting up the task scheduler. So, I would like to do this completely within the IIS context. I googled a little, but could not find anything helpful. Any idea? Thanks. You either have to use a scheduler or set up a service on the box that runs on a timer. You might be able to kludge this with an HTTP Handler, but I am not sure I would head down that path. One thing to consider, as a poor man's method, is to have a "time" set into application that increments by two hours each time it is hit. Then, automatically update the files when a user hits the site and the "time" has timed out. Or, you could make teh PDF request through a page and refresh based on a "timer" value. This way, you are only updating when people are requesting the file, but you are updating all PDFs from a single page or HTTP Handler.  SignatureGregory A. Beamer MVP; MCP: +I, SE, SD, DBA http://gregorybeamer.spaces.live.com Co-author: Microsoft Expression Web Bible (upcoming) ************************************************ Think outside the box! ************************************************ >I have a web service, which needs to run at regular intervals (e.g., > once every 2 hours) to create some PDF files for users to download. [quoted text clipped - 17 lines] > > Any idea? Thanks. On Jul 24, 1:06 am, "Cowboy \(Gregory A. Beamer\)" <NoSpamMgbwo...@comcast.netNoSpamM> wrote: > You either have to use a scheduler or set up a service on the box that runs > on a timer. You might be able to kludge this with an HTTP Handler, but I am [quoted text clipped - 17 lines] > Think outside the box! > ************************************************ Thank you very much. But I am not sure how the timeout strategy works. Anthony, Web Service similar to a Web Application does not run by itself - somebody/something has to trigger it. In your particular case, you may not necessarily want to run the service as a separate process - you can check on every (user) call whether the required file is already created and stored (in the file system or ASP cache) and then either create one or retrieve it from the storage. > I have a web service, which needs to run at regular intervals (e.g., > once every 2 hours) to create some PDF files for users to download. [quoted text clipped - 17 lines] > > Any idea? Thanks. On Jul 24, 1:08 am, Sergey Poberezovskiy <SergeyPoberezovs...@discussions.microsoft.com> wrote: > Anthony, > [quoted text clipped - 29 lines] > > - Show quoted text - Thanks. I think I probably check the file modification time with the current time. If their difference is > 2, then create a new PDF, otherwise, don't create a new one let the user download the existing PDF. Of course, there may be a reader/writer race condition if more than one users wants to download the PDF at the same time. But, we may be able to synchronize using lock, right? Sorta enlightenment from what you said. Create small console exe that consumes the webservice and schedule it using windows scheduler. Regards John Timney (MVP) http://www.johntimney.com http://www.johntimney.com/blog >I have a web service, which needs to run at regular intervals (e.g., > once every 2 hours) to create some PDF files for users to download. [quoted text clipped - 17 lines] > > Any idea? Thanks. On Jul 24, 5:01 am, "John Timney \(MVP\)" <x_j...@timney.eclipse.co.uk> wrote: > Create small console exe that consumes the webservice and schedule it using > windows scheduler. > > Regards > > John Timney (MVP)http://www.johntimney.comhttp://www.johntimney.com/blog O, I know that works, and I did that before, but this time, we do not have full access to our clients' windows system, and we are reluctant to have to get our clients involved in this process. There are right ways and wrong ways to do things. My suggestion is the right way - make your client see that and do the work for them if you have to. You could probably use SQL server and use that to call a webservice on a timer job (if your using it). You could even likely invoke a thread in application on start event that acts as a poll and spawns your webservice. Regards John Timney (MVP) http://www.johntimney.com http://www.johntimney.com/blog > On Jul 24, 5:01 am, "John Timney \(MVP\)" > <x_j...@timney.eclipse.co.uk> wrote: [quoted text clipped - 9 lines] > have full access to our clients' windows system, and we are reluctant > to have to get our clients involved in this process. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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