On 18/08/2011 18:17, Wolfgang Laun wrote:
On 18 August 2011 18:38, Mark Proctor <mproc...@codehaus.org
<mailto:mproc...@codehaus.org>> wrote:
We are looking to tighten up accumulate, using a new keyword to
differentiate. It will use ; for separation, to follow a similar
form to
a 'for' loop.
acc( CE*;
<func>*;
<guard>? )
so something like:
acc( $o : Order();
$min : min( $o.value ),
$max : max($o.value);
$min > 100 && $max < 100 )
Given that I can do this today using an eval after the accumulate CE:
What's the big gain, as compared to the nuisance of yet another CE,
with the need to document (which, traditionally, isn't done so
eagerly) and teach and learn and getting it free of bugs?
I find the above looks cleaner and easier to read, the more we can
reduce the need for 'eval' the better. It is a common enough use case
that I feel it is worth support. Acc is used a lot for CEP use cases and
we need a syntax that can compete succinctly with alternative approaches
- if we look like a dog dinner, we'll lose out to alternative CEP
syntaxes. The separation of the segments using ";" gives a clearer
distinction too, and it's 'for' loop like nature should more natural to
people new to the engine.
Mark
-W
I have wondered if we could use pipes on our functions, to be able to
pass the results of one function into another - just not sure how that
will work or look yet.
func(...) in func(...)
func(...) | func(...)
Mark
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