I wanted to have some functions run when an app starts, and I wanted this
to be configurable, because I plan to use the same architecture for several
apps. So I thought I could have the function names as strings inside of
maps inside of a set (that I sort), in a config file. And I thought I could
use ns-resolve *ns* symbol to turn the strings into references to the vars
where the function definitions are stored. But somehow this is not working.
I have this right now, in mpdv.core, which is the core namespace is an app
I created with lein:
(defn process-startup-hooks []
"2013-02-21- remember, each row in hooks is a map: {:order-of-events 1,
:event-name 'connect-to-database'}"
(connect-to-database)
(let [hooks (sort-by :order-of-events
(:events-called-when-the-app-starts-hooks @um/interactions))]
(doseq [x hooks]
(let [event-as-symbol (symbol (:event-name x))
event (ns-resolve *ns* event-as-symbol)]
(println " what kind of var is this? ")
(println *ns*)
(println (type event-as-symbol))
(println event-as-symbol)
(if-not (nil? event)
(event))))))
"event" is always nil. One of the events listed in um/interactions is
"connect-to-database" so, as a test, I hardcoded it here, to be sure it
could run here, and it runs fine (first line after the comment). So the var
for the function is known. But this:
(ns-resolve *ns* event-as-symbol)
returns nil, even when event-as-symbol is "connect-to-database".
When I println *ns* to the terminal output, I see the namespace is:
#<Namespace clojure.core>
Which surprises me somewhat.
How do I get ns-resolve to look in mpdv.core for the var that I want it to
find?
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