3:39 a.m.
Hi,
How can I modify all objects resulted from a collect operation?
I would like to do something like this: (The following does not work)
rule "test"
when
exists (MyClass());
$l : ArrayList() from collect (MyClass (attribute == false));
$r : AnotherClass();
then
$r.doSomething($l);
for(Object o : $l) {
MyClass o2 = (MyClass) o;
modify(o2) { setAttribute(true); } ;
}
end
I do not want to do:
rule "test"
when
$o : MyClass(attribute == false)
$r : AnotherClass()
then
$r.doSomething($o);
modify(o) {setAttribute(true);};
end
because I need to do a bulk operation… Doing it one by one is extremely inefficient in my
case.
Thanks!
Rodrigo.
9:27 a.m.
On 31 August 2011 03:39, Rodrigo Goncalves <
rodrigo.goncalves(a)coffeebeantech.com> wrote:
Hi,
How can I modify all objects resulted from a collect operation?
I would like to do something like this: (The following does not work)
Why does it not work?
-W
rule "test"
when
exists (MyClass());
$l : ArrayList() from collect (MyClass (attribute == false));
$r : AnotherClass();
then
$r.doSomething($l);
for(Object o : $l) {
MyClass o2 = (MyClass) o;
modify(o2) { setAttribute(true); } ;
}
end
I do not want to do:
rule "test"
when
$o : MyClass(attribute == false)
$r : AnotherClass()
then
$r.doSomething($o);
modify(o) {setAttribute(true);};
end
because I need to do a bulk operation… Doing it one by one is extremely
inefficient in my case.
Thanks!
Rodrigo.
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12:18 p.m.
I doesn't even compile. As o2 did not come from the LHS, I get the follow
error:
The method setAttribute(boolean) is undefined for the type Object
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1:43 p.m.
This works:
rule "test"
when
## exists (MyClass()); ## this is redundant
$l : ArrayList() from collect (MyClass (attribute == false));
$r : AnotherClass();
then
$r.doSomething( $l );
for(Object o : new ArrayList( $l )) {
modify((MyClass)o) { setAttribute(true); } ;
}
end
-W
On 31 August 2011 12:18, chocksmith <rodrigo.goncalves(a)coffeebeantech.com>wrote:
I doesn't even compile. As o2 did not come from the LHS, I get
the follow
error:
The method setAttribute(boolean) is undefined for the type Object
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2:17 p.m.
Yes! It does!
Thanks!
By the way... I use the redundant exists (MyClass()) just for performance...
It avoid an unnecessary collect.
R.
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3:51 p.m.
On 31 August 2011 14:17, chocksmith <rodrigo.goncalves(a)coffeebeantech.com>wrote:
By the way... I use the redundant exists (MyClass()) just for
performance...
It avoid an unnecessary collect.
I wouldn't do both, this exists as well as the "bulk update", unless some
benchmark tests
would show me that it is a gain. Did you?
-W
R.
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4:58 p.m.
Humm... I do not have a benchmark. Thats only intuition... :-)
If the fact does not exist, then all the rest of the LHS do not need to be
tested/calculated. When I try to imagine how is the implementation of the
"collect"... It sounds logical avoiding it if we know that it is not
necessary.
But I agree with you... It is redundant.
Tx!
R.
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5:57 p.m.
Intuition can fail you, with Drools more than with many other systems I
know...
Basically, the exists preceding an accumulate is akin to
if( list.size() > 0 )
for( Elem el: list ){...}
-W
On 31 August 2011 16:58, chocksmith <rodrigo.goncalves(a)coffeebeantech.com>wrote:
Humm... I do not have a benchmark. Thats only intuition... :-)
If the fact does not exist, then all the rest of the LHS do not need to be
tested/calculated. When I try to imagine how is the implementation of the
"collect"... It sounds logical avoiding it if we know that it is not
necessary.
But I agree with you... It is redundant.
Tx!
R.
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6:29 p.m.
:-)
Removed!
R.
On Aug 31, 2011, at 12:58 PM, Wolfgang Laun-2 [via Drools] wrote:
Intuition can fail you, with Drools more than with many other systems
I know...
Basically, the exists preceding an accumulate is akin to
if( list.size() > 0 )
for( Elem el: list ){...}
-W
On 31 August 2011 16:58, chocksmith <[hidden email]> wrote:
Humm... I do not have a benchmark. Thats only intuition... :-)
If the fact does not exist, then all the rest of the LHS do not need to be
tested/calculated. When I try to imagine how is the implementation of the
"collect"... It sounds logical avoiding it if we know that it is not
necessary.
But I agree with you... It is redundant.
Tx!
R.
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8 comments
3 participants
participants (3)
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chocksmith -
Rodrigo Goncalves
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Wolfgang Laun