If I understand your strategy correctly, it works as follows: * write new buffer class * extend buffer class with a field/atom that stores the channel that owns the buffer
* on overflow, call (async/close!) on the owned channel However, looking at : * https://github.com/clojure/core.async/blob/master/src/main/clojure/clojure/core/async/impl/channels.clj#L179 * https://github.com/clojure/core.async/blob/master/src/main/clojure/clojure/core/async/impl/channels.clj#L55 isn't this a deadlock by acquiring the mutex while holding the mutex? On Mon, Jan 13, 2014 at 10:27 PM, Michał Marczyk <michal.marc...@gmail.com>wrote: > Instead of actually implementing a new channel type, you could use the > regular MTMCs, but with your own factory function, custom buffers and > a sprinkle of mutability: > > (defprotocol PBufferThatMightCloseAChannel > (this-is-your-channel! [this c] > "Informs the buffer that c is the channel it might need to close")) > > ;; implement a buffer with an impl for the above protocol; > ;; have it close the appropriate channel on overflow; > ;; suppose closing-buffer is the factory function > ;; producing such channels > > (defn closing-channel [n] > (let [b (closing-buffer n) > c (chan b)] > (this-is-your-channel! b c) > c)) > > Cheers, > Michał > > > On 14 January 2014 05:47, t x <txrev...@gmail.com> wrote: > > I am aware of: > > > > DroppingBuffer and SliddingBuffer > > > > I would like to build a channel with different semantics: > > > > When I try to put an item on a full channel: > > > > * DroppingBuffer drops the new item > > * SliddingBuffer evicts the oldest item > > > > * ClosingBuffer should _close the channel_ > > > > (thus, the receiver eventually gets a nil, and realizes "ah, was > > disconnected") > > > > Now, I am looking at the github core.async code: > > > > DroppingBuffer: > > > https://github.com/clojure/core.async/blob/76317035d386ce2a1d98c2c349da9b898b480c55/src/main/clojure/clojure/core/async/impl/buffers.clj#L33-L45 > > > > ManyToManyChannel: > > > https://github.com/clojure/core.async/blob/76317035d386ce2a1d98c2c349da9b898b480c55/src/main/clojure/clojure/core/async/impl/channels.clj#L31-L198 > > > > ## Problem: > > > > DroppingBuffer is easy to understand. However, I don't think I can > implement > > "ClosingBuffer" as Buffer. > > > > I feel taht "ClosingBuffer" can only be implemneted at the Channel Level. > > > > However, the Channel Code is complicated. > > > > Is there a neat hack / trick to do what I described above? > > > > Thanks! > > > > -- > > -- > > You received this message because you are subscribed to the Google > > Groups "Clojure" group. > > To post to this group, send email to clojure@googlegroups.com > > Note that posts from new members are moderated - please be patient with > your > > first post. > > To unsubscribe from this group, send email to > > clojure+unsubscr...@googlegroups.com > > For more options, visit this group at > > http://groups.google.com/group/clojure?hl=en > > --- > > You received this message because you are subscribed to the Google Groups > > "Clojure" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to clojure+unsubscr...@googlegroups.com. > > For more options, visit https://groups.google.com/groups/opt_out. > > -- > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > --- > You received this message because you are subscribed to the Google Groups > "Clojure" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to clojure+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > -- -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
