Re: [rules-users] RE: Is the future avail in 4.0
Sikkandar Nawabjan wrote:
Hi,
I have couple of questions
1) I want to validate a Object and based upon certain condition set the flag and that flag available in my working memory context so that all the rules will execute based on the value of this flag. Is there any way to set the Global variable in working memory environment and use it in predicate logic.
I beleive passing Global variable using setGLobal() is possible but we can't
use it in predicate logic.
globals can be used in evals, however they should be considered
immutable if you do that and should be set before you assert any working
memory data.
2) my second quetion is i have 2 classes say
Public class B extends Class A{
private boolean flag;
}
am validating my rule using of type B.
But i want to assert object of class A. in normal java we do downcasting B b
= (B)obj;
if i don't do that will downcast will happen at the working memory side
automatically??
If you assert A and there is a pattern on B, A will be matched against it.
Basha
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Re: [rules-users] RE: Is the future avail in 4.0
(1) Theres nothing stopping you using a singleton to hold state, so this
provides what you want:-
rule 1
when
$o : AnObject( someField == someCriteria )
then
boolean someFlag = true;
insert(new State( someFlag ) );
end
rule 2
when
State (someFlag == true )
$o : AnotherObject ( )
then
//something else
end
You could also have the first check activate another AgendaGroup, for
example:-
rule 1
when
$o : AnObject( someField == someCriteria )
then
drools.setFocus(SomeOtherGroup);
end
rule 2
agenda-group SomeOtherGroup
when
$o : AnotherObject ( )
then
//something else
end
(2) I believe the ObjectTypeNode filters based on Class.isInstance() and
therefore you should be able to code rules based upon the sub-class and
insert super-classes.
With kind regards,
Mike
On 06/10/2007, Sikkandar Nawabjan [EMAIL PROTECTED] wrote:
Hi,
I have couple of questions
1) I want to validate a Object and based upon certain condition set the
flag and that flag available in my working memory context so that all the
rules will execute based on the value of this flag. Is there any way to set
the Global variable in working memory environment and use it in predicate
logic.
I beleive passing Global variable using setGLobal() is possible but we
can't use it in predicate logic.
2) my second quetion is i have 2 classes say
Public class B extends Class A{
private boolean flag;
}
am validating my rule using of type B.
But i want to assert object of class A. in normal java we do
downcasting B b = (B)obj;
if i don't do that will downcast will happen at the working memory side
automatically??
Basha
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[rules-users] RE: Is the future avail in 4.0
Hi,
I have couple of questions
1) I want to validate a Object and based upon certain condition set the flag
and that flag available in my working memory context so that all the rules will
execute based on the value of this flag. Is there any way to set the Global
variable in working memory environment and use it in predicate logic.
I beleive passing Global variable using setGLobal() is possible but we can't
use it in predicate logic.
2) my second quetion is i have 2 classes say
Public class B extends Class A{
private boolean flag;
}
am validating my rule using of type B.
But i want to assert object of class A. in normal java we do downcasting B b
= (B)obj;
if i don't do that will downcast will happen at the working memory side
automatically??
Basha
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