[erlang-questions] [ANN:] erlang_cep a new Complex Event Processing Library

[Dan Macklin]

> However, I fail to see the reason why this might be useful in this
> case, as I cannot see any REST API, and reduce functions are quite
> expensive (thus I imply there is no notion of "request", where you can
> implement your match/reduce functions).

Hi,

You're right the reduce is similar to Riak or CouchDB. I wanted to give
users the ability to iterate over matches within a window and perform logic
over them before the results are passed onto a subscribed process (this
could just be output formatting or simple averaging logic).  The difference
here is that the reduce function only runs when the CEP system finds a
match, and you can control the size of the matched data.  This should mean
that the amount of data that the reduce runs over is quite small.

However a rest interface seems a great idea, why didn't I think of that!  So
I'll add it to my todo list.

Many thanks

Dan

On Tuesday, May 7, 2013, Motiejus Jakštys wrote:

> On Tue, May 7, 2013 at 12:54 AM, Richard A. O'Keefe <ok@REDACTED<javascript:;>>
> wrote:
> >
> > On 7/05/2013, at 6:41 AM, Dan Macklin wrote:
> >
> >> I'd like to announce the first beta release of erlang_cep.
> >
> > Looks interesting.  I have just begun to read the documentation,
> > but I don't understand why Erlang code should be specifying
> > what to do by stuffing Javascript code into binaries instead of
> > using Erlang functions.
>
> The idea is the same in Riak (like mentioned in the announcement),
> they provide an option to use javascript for map/reduce
> implementation. Same here: implement "reduce" logic in javascript.
>
> However, I fail to see the reason why this might be useful in this
> case, as I cannot see any REST API, and reduce functions are quite
> expensive (thus I imply there is no notion of "request", where you can
> implement your match/reduce functions).
>
> --
> Motiejus Jakštys
>
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