my outline for this would be as follows. I am not up to v16 yet, so
this will be a 'classic' solution, use of call worker might simplify
this.
write a deamon (a process which spends most of it's life asleep), is
started at server startup.
Deamon :
repeat loop
examine IP array, or Object for data to process
if there is stuff to do
do it
remove processed item from Array/object
if on a timed execution : Delay process(Delay time;Current process)
if only as an on needed basis : Pause process(current process)
until (Quit 4D)
Add item to Array/object:
(on client, adding)
Execute on server : method with needed values
Set semaphore to protect array/object
add as needed
clear semaphore
wake deamon
if (already running : wake (call process deamon process #))
else start deamon
Remove Item from array/object (only runs on server, called from deamon):
Set semaphore to protect array/object
remove as needed
clear semaphore
Chip
On Wed, 7 Nov 2018 00:40:41 +0000, Ben Sokal via 4D_Tech wrote:
> Hello,
>
> Hoping someone can point me in the right direction as I've never done
> something like this before.
>
> We have a multi-user environment running v16r5. Through various
> means, a user can call a method that updates company-specific
> financial data. The problem is that it can take 30+ seconds and the
> user is left waiting until this finishes. What we want to do is this:
>
> - Return control to the user while the task runs in the background.
> We want the task to run on the server instead of on the client
> machine like it's currently doing.
> - If this user or a different user runs the task again for the same
> company, we need to queue it up somehow and do this after the
> previous processing finishes. If this user or a different user runs
> the task for a different company, we could either do the server
> processing at the same time since there's no data conflict, or queue
> it up if there is a risk of trying to do too many things at once.
>
> I've read the language manual and understand the syntax of
> semaphores, which is what I'm thinking I need to use (but am not
> completely sure). Beyond the syntax of commands, I don't know how to
> implement this. For example if I'm doing an "execute on server", is
> the semaphore going to be set on the client side before we call the
> server to run its method, or is it the server method that does the
> semaphore? Is this going to be a local semaphore or global? There are
> transactions involved in the actual processing...does this impact at
> all how I need to go about doing this?
>
> Thanks for any tips!
> Ben
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