Or maybe I just do
(start (assoc system :new-subscriber (component/using (make-subscriber)
[:connection])))
and ensure idempotent start capabilities across all components that will
not attempt restarts.
?
Just looking for the idiomatic component way of doing this.
On Tuesday, August 11, 2015 at 11:49:10 AM UTC-4, Dave Tenny wrote:
>
> I want to add components to a started system, but I'm unsure of a
> component-idiomatic way to do that.
>
> I don't want to restart the whole component stack. I'm guessing assoc'ing
> a new component to the system-map result isn't a good idea (though I've
> read words that sounded like it was a fine thing to do), but then I'd have
> a component that hasn't been started residing with other components that
> have been started.
>
> I though of adding a static component called akin to a pooling component,
> which I would then modify directly in response to my needs, but then I'd
> have a mutable component and that isn't particularly desirable either.
>
> For purposes of discussion let's say this is what I want:
>
> (component/system-map
> {:connection (make-connection)
> :subscriber-1 (component/using (make-subscriber) [:connection])
> ... more subscribers after starting the system ...
> }
> )
>
> It isn't a nice prospect to declare all my subscribers at system-map
> declaration time or (start) lifecycle time,
> I want my system to respond like a service and add new instances of what
> are essentially components.
>
> So I either need to graft more components to the resulting system-map, or
> make a make a system map entity that is mutable and tracks the pool of
> subscribers.
> Under this model I'd have
>
> (component/system-map
> {:connection (make-connection)
> :subscriber-pool (component/using (make-subscriber-pool) [:connection])
> })
>
> Then I'd basically have functions to mutate (:subscriber-pool system) by
> adding/removing subscribers
>
> Thoughts?
>
>
>
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