There is no best approach for this. Yes, you do end up blocking the request
thread, but that’s what needs to happen if you the response requires the
value returned by the channel. You can’t return a response to the browser
and then change it later when the channel sends its value. (You’d have the
same problem with Rx, btw.)
The closest equivalent to Rx’s complete event is that a channel is closed
(in which case anything blocked or parked on that channel will receive nil).
e
On Wed, Mar 25, 2015 at 12:08 AM, coco <clasesparticulares...@gmail.com>
wrote:
> Hi guys...I've a code similar to this:
>
> (defn user-data []
> (!/go
> (let [a (!/<! (<fun-async 2))
> b (!/<! (<fun-async a))]
> {:response b})))
>
> (defn handler-something []
> (let [data (!/<!! (user-data))] ;;block here
> (print data)
> (response data......)))
>
> user-data do a sucession of async calls and return a channel (because it's
> inside a go block no?)
> my handler-something need extract this data and return it in a ring
> response...I can wrap my response function inside a go block, if I do this
> I get
>
> java.lang.IllegalArgumentException: No implementation of method: :render
> of protocol: #'compojure.response/Renderable found for class:
> clojure.core.async.impl.channels.ManyToManyChannel
>
> so basically I use a block get <!! and then return the data...I'm more
> familiar with FRP and in FRP I would use a "onComplete" method which
> basically do the same as <!!
>
> this pattern is correct or I'll end blocking code?...which could be the
> best approach for this?..thanks!
>
>
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