Maybe I don't understand the problem at hand yet -- you can almost 
certainly do this without language help.   Can you help out with a concrete 
example or problematic code?

On Friday, May 5, 2017 at 2:18:17 PM UTC-4, Brian Craft wrote:
>
> This looks like a partial solution:
>
> https://github.com/pjstadig/scopes
>
> perhaps inspired by this discussion:
>
> https://dev.clojure.org/display/design/Resource+Scopes
>
>
>
> On Friday, May 5, 2017 at 5:10:27 AM UTC-7, Herwig Hochleitner wrote:
>>
>> 2017-05-04 19:35 GMT+02:00 Brian Craft <[email protected]>:
>>>
>>> If there's only one with-open it can be reasonably simple to pass the 
>>> consumer into that context (though from ring it's pretty convoluted, due to 
>>> needing to pass control to ring first).
>>>
>>
>> Creating streamed ring responses can be kind of tricky. In my experience, 
>> there are two patterns, that work well:
>>
>> 1) Feeding a PipedInputStream from a new thread:
>>
>> (let [os (PipedOutputStream.)
>>       is (PipedInputStream. os)]
>>   (future (with-open [rs ...]
>>             (write-to! os rs)))
>>   {:body is})
>>
>> 2) Use a ring adapter that allows some form of asynchronous response. 
>> E.g. with the new ring 1.6 model
>>
>> {:body (reify ring.core.protocols/StreamableResponseBody
>>          (write-body-to-stream [_ _ output-stream]
>> (with-open [rs ...
>> os output-stream]
>> (write-to! os rs))))}
>>  
>>
>

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