[Haskell-cafe] A Sliding TChan?

John Lato jwlato at gmail.com
Mon Feb 1 02:24:30 UTC 2016

Control.Concurrent.MVar has an example implementation of a SkipChan, which
is pretty close to what you want:

I also have a package called KickChan that implements something similar; if
a consumer gets too far behind the channel becomes stale and the consumer
will need to reconnect. This can be useful  if e.g. the consumer gets an
initial state and the channel only communicates updates.

On 14:17, Thu, Jan 28, 2016 Noon Silk <noonslists at gmail.com> wrote:

> I think you should be able to do this with the `pipes` and
> `pipes-concurrency` libraries, in particular have a look at:
> http://haddock.stackage.org/lts-5.0/pipes-concurrency-2.0.5/Pipes-Concurrent.html#v:newest
> --
> Noon
> On Fri, Jan 29, 2016 at 7:30 AM, Mark Fine <mark.fine at gmail.com> wrote:
>> We're currently using a TMChan to broadcast from a single producer thread
>> to many consumer threads. This works well! However, we're seeing issues
>> with a fast producer and/or a slow consumer, with the channel growing
>> unbounded. Fortunately, our producer-consumer communication is
>> time-sensitive and tolerant of loss: we're ok with the producer always
>> writing at the expense of dropping communication to a slow consumer.
>> A TMBChan provides a bounded channel (but no means to dupe/broadcast)
>> where a writer will block once the channel fills up. In our use case, we'd
>> like to continue writing to the channel but dropping off the end of the
>> channel. Clojure's core-async module has some related concepts, in
>> particular the notion of a sliding buffer
>> <https://clojure.github.io/core.async/#clojure.core.async/sliding-buffer>
>> that drops the oldest elements once full. Has anyone encountered something
>> similar in working with channels and/or have any solutions? Thanks!
>> Mark
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> --
> Noon Silk, ن
> https://silky.github.io/
> "Every morning when I wake up, I experience an exquisite joy — the joy
> of being this signature."
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