[Haskell-cafe] Bounded STM Queues with load shedding

[Yuras Shumovich]

On Sat, 2015-02-28 at 08:31 -0800, Alex Hammel wrote:
> Forwarding from Haskell-Beginners:
> 
> Hi list,
> 
> It would be handy for me to have a bounded STM Queue along the lines of
> TBQueue with the difference that when the queue is full, a call to
> writeTBQueue is a non-blocking no-op.
> 
> This is in the context of an asynchronous logging system. If the load
> (somehow) gets heavy enough that the log message queue is taking up a lot
> of memory, It's better to lose a few log messages than to have processes
> block until the logger catches up.
> 
> Are there any off-the-shelf solutions?

You can try the stm-chans package:
http://hackage.haskell.org/package/stm-chans-3.0.0.2/docs/Control-Concurrent-STM-TBMQueue.html#v:tryWriteTBMQueue

Thanks,
Yuras

> 
> Cheers,
> Alex
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