Fix Version/s: None
Sprint:AP F20-3 (August), AP F20-4 (September)
After discussion with Krzysztof Findeisen about approaching implementation of the new Filter design, we wanted to write down a list of requirements for the new system.
RFC-541 was more focused on technical requirements, but some of the comments there can be built on to help with use case requirements. RFC-624 provides a design, but discussion since that has led to some questions about how exactly that design maps to how this system would be used.
For this ticket, I will write up (probably not a DMTN?) a list of use cases and requirements for Filters in the stack, based on the above RFCs, my own experiences with the Instrument FilterDefinitions, and expectations for how filter names are used for photometry.
DM-26259 Create design sketch for new filter system
DM-26614 Create RFC for new filter design
I think this includes everything we need now, and I'm pretty confident any new middleware needs would basically be additions (to FilterDefinitions in obs_base) that would not affect code that gets filters but does not define them.
By far the biggest middleware priority for filter work is just removing the current constraint that one (and only one) CameraMapper must be instantiated in a process in order for Filter to be usable.
Returning this to "In progress" after discussion regarding middleware requirements re: unique labels. We need to say something about that in the above requirements list one way or the other.
Re-closing this after another requirements discussion on #dm-middleware (with updates to the Confluence page). While we may still need to iterate on requirements as development proceeds, I don't think we want to keep this issue open until the new filter system is shipped.
The requirements list and other notes are on this confluence page:
Jim Bosch: do you believe that this encompasses all the necessary requirements for the new FilterLabel system? I'm not sure whether the middleware section is complete enough, but I also don't know what needs to go in there.
The code sketches I wrote will be modified more and reviewed separately as