Expert answer is always “it depends”.
And long winded answer:
I’d first write a function that can send one “email”:
(defn send-email! [ctx email-data] …) ; context contains whatever outside
resources you need
Now you have the freedom to work on a list of email-data like this:
(doseq [email emails]
(send-email ctx email))
So now you could do something like
(let [emails (read-unsent-emails! [db])]
(doseq [email emails]
(send-email ctx email)))
put that in a main, create a uberjar and make a cronjob which runs every 5
minutes.
Or, you could as you suggest do it in a scheduler, I think I’ve used a clojure
wrapper for quartz previously.
but I know the people from Juxt has some stuff that might be nice as well.
Or you could use make a transducer, (map (partial send-email ctx), and use that
on your async channel.
Erik.
> On 26 Oct 2018, at 15:05, brj...@gmail.com wrote:
>
> You are quite right. My plan is to save emails that must be sent (not all
> need guaranteed delivery) to a database but queue them right away in a worker
> thread. The DB will then be updated with delivery status. In the interest of
> reducing IO, I would prefer not to have to write and read from the DB for all
> emails but only in case of a crash or mail server down something similar. So
> there needs to be continuous monitoring of the email table - which requires
> some sort of ever running task? Would you suggest a go block or using a
> scheduler (there seem to be quite a few options of Clojure schedulers).
>
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