Hi,
I am trying to integrate Stuarts component library into my application. I
am not sure if I use it correctly or do something else wrong or just have a
wrong mindset. So I will explain how I am currently using it and the
problem I see with it.
I have three components: database, a scheduler and web application (note
that my example is simplified to get faster to the point). These components
are built like this:
(component/system-map
:database (db db-uri)
:scheduler (component/using (scheduler) [:database])
:web-app (component/using (web-app)
[:database
:scheduler] ))
And in my web-app I do something like this:
(start [component]
(let [db-conn (get-in web-app [:database :db-conn])]
(assoc component :server
(run-server (make-handler web-app db-conn) {:port
port}))))
And make-handler is a middleware that associates the database component
into the request map.
Now as I added the scheduler to my system it occured to me that I will have
to associate the scheduler into the request map too to access it and I
might have to do that for every other component that is coming along the
road.
So basically I am tying my web-app to to all these components and I am
tying some components to other components (like scheduler component to the
database component).
And by tying this things together this way they do depend on each other and
I cannot move them anymore. This came to my mind as I started thinking
about microservices.
So let's say I want to convert the scheduler into a restful microservice,
it's hard to pass in a database connection into it via HTTP, so it seems
like it's not decoupled enough. Does that make sense?
Am I using it wrong? Is it ok to pass all kind of dependencies into the
request map and shove it around in the web application? Any other
suggestions / remarks?
Best Regards,
Sven
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