[rules-users] sliding window combination ?
Wolfgang Laun
wolfgang.laun at gmail.com
Thu Jul 7 11:04:35 EDT 2011
Using a simple
class Request{ String id;... }
and an auxiliary
class IdCount {String id; int count; ... }
and some insertions
kSession.insert( new Request( "a" ) );
kSession.insert( new Request( "b" ) );
kSession.insert( new Request( "c" ) );
kSession.insert( new Request( "b" ) );
kSession.insert( new Request( "c" ) );
kSession.insert( new Request( "c" ) );
the rule below
rule countById
when
$list: List()
from accumulate( Request( $id: id ),
init( Map id2count = new HashMap() ),
action( IdCount ic = (IdCount)id2count.get( $id );
if( ic == null ){
ic = new IdCount( $id, 1 );
} else {
ic.setCount( ic.getCount() + 1 );
}
id2count.put( $id, ic ); )
reverse( IdCount ic = (IdCount)id2count.get( $id );
ic.setCount( ic.getCount() - 1 );
id2count.put( $id, ic ); )
result( id2count.values() ) )
IdCount( $id: id, $count: count > 1 ) from $list
then
System.out.println( "Id " + $id + ": " + $count );
end
produces
Id c: 3
Id b: 2
-W
On 7 July 2011 16:55, Andre <morpheusandre at web.de> wrote:
> it seems much clearer, thxxxx but im afraid that this was not the last
> question...
>
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> http://drools.46999.n3.nabble.com/sliding-window-combination-tp3132340p3148448.html
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