I am getting my feet wet with core.async and am trying to attach atoms to
channels that update automatically and print out to the console as you take
and put. This is not for anything serious, just a way to get familiar with
the behavior and functionality of the library and practice my Clojure
skills. Thanks in advaan
Here is my code:
(defn log-name [ch] (symbol (str ch '-log)))
>
> (defmacro transparent-chan [ch] ;; This is probably not correct, but
> I wanna do something like this
> (do
> `(def ~ch (chan))
> `(def (log-name ~ch) (atom []))
> `(println "new transparent channel created!")))
>
> (defn- update [log v]
> (do
> (swap! log conj v)
> (println "log test passed: v " has been logged")
> (println "channel contents: " @log)))
>
> (defn transparent-put [ch v]
> (let [log (log-name ch)]
> (update log v)
> (println "put test passed: " v " has been put on the channel")
> (println " rechecking log: "@log)
> (go
> (let [ch ch
> v v]
> (>! ch v)
> (println v " has been successfully put/read from the channel!")))))
>
> (defn transparent-take [ch]
> (go
> (let [v (<! ch)
> log-name (symbol (str ch '-log))]
> (swap! log-name #(remove #{v} %))
> (println v "has been removed from channel")))
> (println " removal pending"))
My main questions are regarding variable scope:
1) I feel like it is a redundant to define bindings multiple times in my go
and let exprs for params that are already passed in as arguments. Is there
a more idiomatic way to do this?
2) Whenever I try to create a generic process to automatically generate a
log-name for each channel and then call update, I get a 'symbol cannot be
cast to atom' error. How can I get around this? It seems to happen even if
I don't use the log-name function.
3) Is this a useful thing to be doing: is there a way to query and keep
track of what's on a channel without using a macro or atoms?
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