Hi,
I am trying to understand the new 1.2 error handling of agents. For
this I created a minimal example which shows a strange behavior, at
least for my understanding
(def ag (agent 1))
(defn handler-fn [a e]
(println "state of agent:" @a)
(println "error:" e))
(defn raise-except-action [state new]
(throw (Exception. "Action Exception")))
(set-error-mode! ag :continue)
Now, sending the exception raising function as an action to the agent
works just fine. According to the error-mode it ignores the update.
(send ag raise-except-action)
But if I set an error handler like this:
(set-error-handler! ag handler-fn)
I see an exception when trying to send the above function again:
(send ag raise-except-action)
state of agent: 1
error: #<IllegalArgumentException
java.lang.IllegalArgumentException:
Wrong number of args (1) passed to:
agent-errors$raise-except-action>
I don't understand why raise-except-action is called with just one
argument. I did some more testing which showed that the one argument
passed to the action-fn is a list of the agent and the error. And
this I understand even less. But then, it was late in the night, when
I did this, so maybe that last information is not correct.
Any enlightenment, ideas?
Kind regards,
Stefan
;; Why is raise-except-action called?
;; Examining the args shows that it's a list of agent and error
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