If you provide an error handler on the agent -- or just specify the error
mode as :continue -- it does not hang. That makes me think that what you're
seeing is "expected behavior" although it does seem a bit strange...?
On Wed, Jun 10, 2020 at 1:49 AM Ernesto Garcia wrote:
> I have discovered that, in the case of an agent action exception, the
> behavior of agent await depends on timing:
> - If your await happens to execute after the action is completed, it will
> happily throw an exception that the agent is in a failed state.
> - If your await happens to execute before the action is completed, it will
> dangerously block. (!!!)
>
> Shouldn't await behave the same in both cases?
>
> Code example:
>
> (defn await-agent-after-fail []
> (let [agt (agent nil)]
> (send-off agt (fn [_]
> (println "Agent throws exception now")
> (throw (ex-info "fail!" {}
> (Thread/sleep 1000)
> (println "Agent is awaited now...")
> (println "Await timed out?" (not (await-for 1 agt)
>
> (comment
> (await-agent-after-fail))
>
>
> (defn await-agent-before-fail []
> (let [agt (agent nil)]
> (send-off agt (fn [_]
> (Thread/sleep 1000)
> (println "Agent throws exception now")
> (throw (ex-info "fail!" {}
> (println "Agent is awaited now...")
> (println "Await timed out?" (not (await-for 1 agt)
>
> (comment
> (await-agent-before-fail))
>
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