On Thu, Jan 22, 2009 at 2:52 PM, Greg Harman <ghar...@gmail.com> wrote: > > I like the example, and I should be able to adapt it. I do have one > question about the example (probably not related to agents: > > ; queue up some work to be done > (defn add-job [func] > (let [a (agent nil)] > (send a (fn [_] (func))) > (swap! jobs #(conj %1 a)))) > > What is the notation fn [_]? I can't seem to find any documentation > for what _ as a function argument means...
It's a conventional name for unused/ignored arguments. > > On Jan 22, 6:14 am, Greg Harman <ghar...@gmail.com> wrote: >> Thanks Tim, I'll have a look at that. >> >> To clarify my use case, I was thinking of events that can be processed >> sequentially but that may take a non-trivial amount of time to >> complete (both CPU and IO bound at different stages of processing) so >> it's ideal to have a thread pool to process different tasks in >> parallel, even though they are independent. (That's step one. Step two >> will be spreading that "thread pool" out over multiple JVMs running on >> different hardware). >> >> On Jan 22, 2:39 am, Timothy Pratley <timothyprat...@gmail.com> wrote: >> >> > Hi Greg >> >> > Here is a proof of concept of one approach you could >> > take:http://groups.google.com/group/clojure/web/job-queue.clj >> >> > A set of agents are maintained to represent computation jobs. When the >> > results are gathered, the agent is thrown away. I think using multiple >> > agents in this way could be quite convenient as it means the jobs can >> > be done in parallel. >> >> > If you run the script from the command line you should get something >> > like this: >> > C:\java>clj job-queue.clj >> > (4 3) >> > (0 nil Hi mum) >> > Which are the results of multiple queued computations taken at two >> > subsequent points in time. >> >> > From your post it wasn't clear to me if your 'events' imply sequential >> > processing (which could be achieved with a single agent). >> >> > Regards, >> > Tim. > > > -- Venlig hilsen / Kind regards, Christian Vest Hansen. --~--~---------~--~----~------------~-------~--~----~ 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 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 -~----------~----~----~----~------~----~------~--~---
