I think the “reducible streams” approach described by Paul Stadig here 
<http://paul.stadig.name/2016/08/reducible-streams.html> has potential. It 
might not cover all of the scenarios you’re thinking of, though.

On Thursday, May 4, 2017 at 1:35:48 PM UTC-4, Brian Craft wrote:
>
> The with-open style is used a lot in the jdbc lib, and elsewhere. It's 
> pretty simple when data is very small, as you can just evaluate the entire 
> result with doall, etc.
>
> How do you deal with larger data, where you need to evaluate iteratively? 
> 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). But if there are multiple with-open 
> you have to nest them, with a continuation passing style, or middleware 
> pattern, or something, which quickly becomes onerous as it affects all the 
> code surrounding the with-open.
>
> Is there some simpler pattern?
>

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