Sierra's Component

[dieter.v...@gmail.com]

Hello,  I'm playing a bit with the 'Component' library. The system has some initial configuration (port numbers, uri's, usernames,...) in code.

I'm doubting to eighter pass configuration when constructing the system:
(C/system-map
 :mycomponent  (map->MyComponent {:conf ...})

OR to pass configuration itself as a component
(defrecord Config ...)
(C/system-map
:config ...
:mycomponent
   (C/using (map->MyComponent ...) [:config])

Is there any reason why to prefer one way over the  other or is it just personal preference?

kind regards,
Dieter

[Paul Stadig]

You can do either. If you pass the config as a dependency, then you have to access it in the `start` method after dependency injection has occurred.

Sometimes it is useful to write a constructor function to initialize the component. If that constructor needs access to the config it must be passed to the function, not provided as a dependency.

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