Re: [rules-users] Help -- Conditional Logic in DRL
Note to drools devs: I didn't put the original poster up to this. :)
Globals should be considered immutable, so shouldn't be used in this way. You could do
it with an object asserted in working memory, though.
Just as good, though, you can use this kind of pattern to replicate else logic:
rule "EverythingMatches"
when
Condition0
Condition1
Condition2
then
...
end
rule "ElseAtCondition2"
when
Condition0
Condition1
!Condition2
then
...
end
rule "ElseAtCondition1"
when
Condition0
!Condition1
then
...
end
rule "ElseAtCondition0"
when
!Condition0
then
...
end
--- On Mon, 6/15/09, Scott Reed <sreed(a)avacoda.com> wrote:
From: Scott Reed <sreed(a)avacoda.com>
Subject: Re: [rules-users] Help -- Conditional Logic in DRL
To: "Rules Users List" <rules-users(a)lists.jboss.org>
Date: Monday, June 15, 2009, 10:19 PM
Looks like 5 rules with a global flag
might work:
global boolean flag = false;
rule "name1"
when
(condition1 == true )
(flag == false)
then
consequence1();
flag = true;
end
...
rule "name5"
when
(condition5 == true )
(flag == false)
then
consequence5();
flag = true;
end
Does that work for you?
Vishy [6/15/2009 11:06 PM] wrote:
> Hi All,
>
> I am new to drools...and am trying to figure out as to
how I can
> represent the following logic in a DRL file.
>
> if (condition1) {
>
> if (condition2) {
>
> } else if (condition3) {
>
> } else if (condition 4) {
>
> } else if (condition 5) {
>
> }
>
> }
>
> In DSL, a typical rule is represented as follows:
>
> rule "name"
>
> when
> condition is true
> then
> consequence
>
> end
>
> How can I represent the above mentioned if - else
logic in DSL? Or is
> it not possible?
>
> If it is not, can you please suggest any alternative?
>
> Thanks much!!
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
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