Update behavior
by Burns, Barbara L (Barb)
Can someone help explain the following behavior?
Rule "rule1"
Agenda-group "apples"
No-loop
When
Apple(color matches "red")
Response(name1 ==null);
$response : Response()
Then
$response.setName1("gala");
drools.setFocus("oranges");
End
Rule "rule2"
Agenda-group "oranges"
No-loop
When
Orange(color matches "orange")
Response(name2==null)
$response:Response();
Then
$response.setName2("sunkist");
update($response)
drools.setFocus("banannas");
There is 1 Apple in working memory with color matches red and 1 Orange
with color matches orange.
And there is 1 Response in working memory.
What we don't understand is that upon the update from Rule2, the
activation from rule1 refires even though $response.name1 has seemingly
been set to "gala" and should no longer match.
If the above is written as:
Rule "rule1"
Agenda-group "apples"
No-loop
When
Apple(color matches "red")
$response:Response(name1 ==null);
Then
$response.setName1("gala");
drools.setFocus("oranges");
End
Rule "rule2"
Agenda-group "oranges"
No-loop
When
Orange(color matches "orange")
$response: Response(name2==null)
Then
$response.setName2("sunkist");
update($response)
drools.setFocus("banannas");
Then rule1 activation is not refired.
