[rules-users] accumulate vs collect

[Wolfgang Laun]

The suggested workaround (before this was fixed) is to use
   count(1)
which achieves the same effect.
-W

On 11 November 2010 19:30,  <rouvas at di.uoa.gr> wrote:
> Hi List,
>
> I'm trying to count the number of objects I have in the Working Memory
> using accumulate, but I'm having a ClassCastException thrown at me.
>
> Using a variant with collect, everything work OK.
>
> Can someone shed some light on this issue?
> Is it related to https://jira.jboss.org/browse/JBRULES-2202 ?
>
> I'm using Drools.5.0.1 and the fact is a declared one, as follows:
>
> declare t_1
>  regRowId : String
>  versionId : String
>  c_7 : String
>  c_1 : String
>  c_2 : String
>  c_3 : String
>  c_4 : String
>  c_5 : String
>  c_6 : Double
> end
>
> trying with :
>
> v945 : Number ( doubleValue  >=  1 ) from accumulate ( p : t_1 (  c_6 >=
> 20100511 && c_7 == "5" ) , count(p) )
>
> I'm getting a ClassCastException:t_1, while using :
>
> v945 : ArrayList ( size  >=  1 ) from collect ( t_1 (  c_6 >= 20100511 &&
> c_7 == "5" )  )
>
> works OK.
>
> The reason I'm preferring accumulate over collect, is that I'm not really
> interested in constructing an ArrayList of the matched facts (worries
> about memory consumption), all I want is how many of them are there.
>
> The actual rule I'm using (although I don't think it matters) for the
> accumulate variant, is:
>
> rule "r95944.6"
>        dialect "mvel"
>        when
>                gnId : GoodNumbers()
>                 LogicalValue : Trader( gnId.goodNo==goodNo  )
>                 v945 : Number ( doubleValue  >=  1 ) from accumulate ( p : t_1 (  c_6
>>= 20100511 && c_7 == "5" ) , count(p) )
>        then
>                RaResultCode rrc = new RaResultCode();
>                  rrc.setResultRuleId("95944");
>                  rrc.setResultRuleVersionId("6");
>                  rrc.setResultColor("R");
>                  rrc.setResultRuleCode("01");
>                  rrc.setResultAction("1");
>                  rrc.setResultGoodNo(gnId.goodNo);
>                insertLogical(rrc);
> end
>
> Thank you for your time.
>
> -Stathis
>
>
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