Re: [rules-users] How to count number of facts of a type in memory?
Wolfgang
I tried both using collect and accumulate and they both worked as you suggested.
ArrayList( $total : size>0 ) from collect ( Asset())
Number ($total:intValue ) from accumulate ($asset:Asset() ,count($asset))
Thanks,
Ram
--- On Sat, 9/3/11, Wolfgang Laun <wolfgang.laun(a)gmail.com> wrote:
From: Wolfgang Laun <wolfgang.laun(a)gmail.com>
Subject: Re: [rules-users] How to count number of facts of a type in memory?
To: "Rules Users List" <rules-users(a)lists.jboss.org>
Date: Saturday, September 3, 2011, 9:47 PM
2011/9/4 puja nandamuri <med_9501(a)yahoo.com>
I tried to create the following rule using a simple drl to just count the number of Asset
facts in memory.
An Asset can be a very simple class. I am not sure if the fields or methods are really
relevant in this rule.
rule " Count number of Assets Rule"
dialect "mvel"
when
asset:Asset()
ArrayList($total:size >0) from collect ( asset)
The first operand of collect is a pattern, not a bound variable. Therefore, use
ArrayList($total:size >0) from collect ( Asset() )
Just for counting, accumulate would also be possible:
Number( $total: intValue ) from accumulate( Assert(), count(1) )
-W
then
System.out.println(" Number of Assets in memory"+total);
end
This fails. my understanding of how collect works seems to be wrong :(
can you please correct the mistake I might be doing here ?
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