Catch exception from async process in Clojure? -


assume i'm sending email, asynchronously, , want program continue execution. far, i've been doing futures, unfortunately, when email fails send, no exception raised.

i understand dereferencing future raise executionexception, derefing defeat point.

is there better way "fire , go", without losing exception information?

i'd go agents this, using handler functions handle exceptions thrown agent actions:

(agent initial-state :error-handler handler-fn)

see (doc agent), (doc set-error-handler!), (doc set-error-mode!) details. initial-state here might nil, or perhaps structure holding logging data.

to make convenient, you'd want have email function usable send (send-off, send-via):

(defn email [agent-state message] ...)

if main thread needs notified amiss, need pay attention communications on channel. (java queues 1 possibility, channels of core.async another.) handler function can push messages on channel.


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