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F# service
f#asynchronous

In order to have some practice in F#, I'm thinking of creating a F# service in charge of reading messages from a queue, interpreting those messages and executing the corresponding tasks in an asynchronous way, and very important, being able to support a cancel message coming with some sort of identifier that should allow the cancellation of a particular task initiated with a message.

So, let's say the service has to respond to the following messages:

Process(id) -> this needs to be processed asynchronously, where id is an integer that will identify a task that might be cancelled at a later time if we want.

Cancel(id)-> the message for cancelling a particular task

Exit-> for finishing the service

Any idea about how to start this? Some approaches?

.

I've written a Windows Service which does some of the same things, and the general idea I used, was:

- Started a simple C# Windows Service project to do the basics

- Used timers in this project to call up functions from the F# library doing the heavy lifting

- Had a database table representing the queue, piping the entries from this table into a function which put it on the "in code" queue

- The in code queue was a MailboxProcessor, with partially applied functions in async blocks

I'll see if I can make a simpler example out of it - stripping out the business specific - later :)

By on 9/14/2010 2:48 AM ()

Is this service to run in a different process?

I guess not - so to my mind comes the MailboxProcessor and the Async-blocks in general. There should be everything you need.

If you want more detailed responses please try to focus a bit more on concrete problems. The way you asked this questions makes it a bit hard to really answer in a helpful way without writing the hole thing yourself.

By on 9/13/2010 9:48 PM ()

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