Hello Sean,
You want
(def test-query
(agent
`[test-coll
(take 2)]))
to fully qualify test-coll (and also take, btw) because when passed to
eval on the agent's thread, who knows to which value *ns* will be
bound ?
(tested on my machine)
HTH,
--
Laurent
2010/4/29 Sean Devlin <francoisdev...@gmail.com>:
> I'm having a lot of trouble getting an app to work. I'm using agents
> in a GUI app. For the sake of discussion I've got the following
> things defined:
>
> (def test-coll
> [{:a 1 :b 2 :c 3}
> {:a 4 :b 5 :c 6}
> {:a 7 :b 8 :c 9}
> {:a 10 :b 11 :c 12}
> ])
>
> (def test-query
> (agent
> '[test-coll
> (take 2)]))
>
> (def test-result (agent []))
>
> I want to execute test-query like so:
>
> user=> (eval `(->> ~@(deref test-query)))
> ({:a 1, :b 2, :c 3}
> {:a 4, :b 5, :c 6})
>
> This part works at the REPL fine. Next I wrap it in a closure:
>
> user=> ((fn [& args] (eval `(->> ~@(deref test-query)))))
> ({:a 1, :b 2, :c 3}
> {:a 4, :b 5, :c 6})
>
> Also fine.
>
> Now, I want to send this to the agent test-result
>
> user=> (send test-result (fn [& args](eval `(->> ~@(deref test-
> query)))))
> #<Agent (...)>
>
> user=> @test-result
> #<CompilerException java.lang.Exception: Agent has errors
> (NO_SOURCE_FILE:468)>
>
> user=> (agent-errors test-result)
> (#<CompilerException java.lang.Exception: Unable to resolve symbol:
> test-coll in this context (NO_SOURCE_FILE:459)>)
>
> Blargh.
>
> Why doesn't this work when I use send? I'm at a loss here.
>
> Sean
>
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