Support for timers

[woile]

Goal

Execute scheduled functions

Discussion

• Do we want this? With systems like appscheduler or kubernetes cron jobs
• Maybe we can defer the discussion for later

Ideas

1. Decorator

from dam import send, timer

@timer(ms=20)
async def hello():
    send("a-topic", {"name": "jon"}

2. Add them in a list

This would follow a similar approach to routes

from dam import Timer, App
from .myapp import hello

timers = [
    Timer(hello, ms=20)
]

App(timers=timers)

[marcosschroh]

Option 1 seems maybe more pythonic way, but what I like about option 2 is that we can have a central place where we can see all timers registered at the moment. Shall we go for option 2?

[woile]

The thing with a timer list is that you have them in the same place, it's easy to track, and follows the same approach as Topic. Otherwise you may have them spread in various places.
Also approach 1 is the inverse implementation of what we currently have:
everything sinks (topics, confs?? timers??) into the app (like django)

if we use a decorator it would be the reverse approach.
app should receive the stuff and store it somewhere for the decorator to be consumed (like flask)

So I think we should go for approach 2 as well.

But of course way into the future this feature, if we ever need it.