How to execute a class method of a process periodically?

Question

Question

Ben Webb · Aug 15, 2022

#Business Rules #Business Service #Ensemble #HealthShare #InterSystems IRIS

Hi all,

I have a requirement to periodically poll a URL to fetch some XML data based on a list of query data, lets say every hour, and map what's returned to HL7 then send downstream, I mostly have everything contained within a business process and DTL but I'm lacking a way of invoking the process every X minutes,

The client has a prefence for as much as possible to be done via out of the box components in the standard HL7 model of "Service --> Process/Rule/DTL --> Operation" within the Web UI,

I'm looking for something to act as the Service part that will trigger the "Process/Rule/DTL --> Operation" parts,
In Rhapsody we might use a Timer component to send a blank dummy message periodically that triggers some javascript logic and the rest of the flow etc.,
What could I use to provide the same functionality in HealthShare?

Thanks for your help :)

Product version: HealthShare 2020.1

Discussion (5)1

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Eduard Lebedyuk · Aug 15, 2022

Use a Business Service with a basic Ens.InboundAdapter:

Class test.BS Extends Ens.BusinessService
{

Parameter ADAPTER = "Ens.InboundAdapter";

Method OnProcessInput(pInput As %RegisteredObject, Output pOutput As %RegisteredObject) As %Status
{
	$$$LOGINFO("In OnProcessInput")
	Quit $$$OK
}

}

Add it to production and set Call Interval to X seconds (and Pool Size to 1). That would ensure OnProcessInput being called every X seconds after it's last completion.

3 0

score 0 · Answer 1 · 2022-08-16T06:45:40-04:00

Perfect, that's what I was looking for, And I would make my calls to the API there, build out a message and send the XML on to the DTL that adapts to HL7?

score 0 · Answer 2 · 2022-08-16T07:35:23-04:00

Yes.

Alternatively you can sync call some BO to make an API call, wait for a response and send that to DTL.

It might make sense if you already have a BO/some-other-preexisting-API-caller so you don't have to reimplement the API call code in BS.

score 2 · Answer 3 · 2022-08-16T02:56:14-04:00

You can also use IRIS scheduled tasks.

I recommend to take a look at this project, that gives you ability to schedule a class-method execution via cron expression.

score 0 · Answer 4 · 2022-08-16T06:21:06-04:00

Hi thanks for the reply, this seems like the cleanest way and CRONs are a good option but our client won't accept external libraries

How to execute a class method of a process periodically?

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