Simple Example of Async working in a Perspective View Object

Ignition
1

Hello. I’ve looked through the forums and I was unable to find a simple example of async code that would work in a perspective view object.

I even went as far as copying and pasting code from the later.py file but that also did not work.

May someone direct me to a concise, working example for a perspective view object class or suggest an alternative approach?

For reference, I am on Ignition Platform 8.1.48

2

I'm not sure what you mean by this.

What are you trying to accomplish, and why do you believe it needs to be asyncrhrous?

1 Like
3

Want to run a function async system.util.runAsynchronous is right there, but I agree with @lrose - I would not start making things async unless I had a reason too. IIRC too there is less reason to need async with perspective?

4

Currently the code is synchronously calling three api endpoints to then parse the large amount of data to then load it into a table. I would like to asynchronously call all three so processing time is reduced.

5

Do all your clients share this same data (or just filter it differently but otherwise rely on the same data)? If this is a case, have a gateway timer script (or a tag change script if there is an event style you know when you need to refresh from this API) do your call to the API’s, put it in a gateway tag. Then have your perspective table bind to this tag. You can filter between the gateway tag and table if needed with a transform or expressions if you use the Integration toolkit.

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(post deleted by author)

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Would this approach work for large amounts of data? How would parsing from the tags afterwards work? I ask this because all the data, after being received, has to be joined together to make the final output for the table.

8

This post might be useful - CompletableFuture is a layer above the raw threading you can do using invokeAsynchronous. I would endorse the advice to run this in a timer script or something similar.