[Feature Request]: handling multiple selectors for single event on `ActivityProcessor.execute_middleware_chain`

[aviadpriel]

Bug Description

When multiple handlers match an activity (e.g., multiple on_invoke handlers), the middleware chain returns the response from the first handler that executes, even if that handler returns None to signal "not handled".
The expected behavior is that the chain should return the first non-None response from any handler in the chain.

Handlers returning None may not call ctx.next() because None semantically means "pass"

Steps to Reproduce

1. Register multiple app.on_invoke() handlers
2. First handler checks activity name, returns None if not matching
3. Second handler should handle the event but never executes (or its response is ignored)

Expected Behavior

allow multipal on_invokes and or better selectores intrafaces

Actual Behavior

see Steps to Reproduce

SDK Version

2.0.0a6

Python Version

313

Additional Context

No response

[lilyydu]

Hi @aviadpriel, this is our current intended approach, but will take this in as a feature request rather than a bug.

Instead of having multiple handlers, we suggest a single invoke handler with conditional handling inside of it.

Out of curiousity, could you describe more on what scenarios you're handling with various invoke handlers?

[aviadpriel]

Hey @lilyydu in the end I found a solution
By instead of calling the on_invoke helper
I addin my own selectors
I make them more specific

The issue is when the app is growing we went to handle multiple flows

I think that like API we do not need to support multiple handles per event

But provide a better selection functions

[aviadpriel]

@lilyydu In general, I work now on an app for our company
That is already supported on other platforms

And I want to join the development of this SDK

For example, I created a version of the app that allows me to integrate the Teams app on an existing FastAPI server
So I do not need to create a server for it

[lilyydu]

@aviadpriel,

Got it, glad you got it working! In terms of your feedback for better selection functions, what are you suggesting in particular? Want to make sure we capture your notes properly :)