I like the idea of passing in the *key* of the external collaborator -
that's nice. Thanks Stuart.
I am surprised there isn't more call for nested systems - maybe there
is and this solution is sufficient-enough...
Again - thanks Stuart!
On 12 March 2015 at 15:16, Stuart Sierra <the.stuart.sie...@gmail.com> wrote:
> On Wednesday, March 11, 2015, Colin Yates wrote:
>> I can't merge the two systems because the reusable
>> component is chocka full of very fine grained command
>> handlers and both the internal and external systems will
>> have their own 'bus' for example. I could namespace the
>> keys but that again feels painful...
>
> That's exactly how I would do it.
>
> Nested systems don't really work.
>
> But one system can contain implicit "groups" of components.
>
> Create each group as a map, then `merge` them into the
> system.
>
> Use namespaced keys to prevent clashes.
>
> The constructor functions for each component (or component
> group) can take an argument which tells them the names of their
> dependencies in the system.
>
> Pseudo example:
>
> (defn reusable-component [collaborator-key]
> (component/using (map->ReusableComponent {})
> [:my/logger :my/bus collaborator-key]))
>
> (defn reusable-group [collaborator-key]
> {:my/logger ...
> :my/bus ...
> :my/reusable-component
> (reusable-component collaborator-key)})
>
> (defn new-system []
> (merge (system-map :main/logger ...
> :main/bus ...
> :main/collaborator ...)
> (reusable-group :main/collaborator)))
>
>
> -S
>
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