7:10 p.m.
I want to convert my drl to dsl and dslr. I found that if I choose using dsl,
I couldn't write java code in rules any more. I must translate everything in
dsl file. Can I combine dsl and drl in dslr file, like below rule. when I am
using dsl, I will get an error: "[10] Unable to expand:
System.out.println("add caculation start");"
rule "add caculation"
agenda-group "add"
no-loop true
dialect "java"
lock-on-active
when
$m: Whether exist event
then
System.out.println("add caculation start");
System.out.println("add caculation end");
end
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12:59 a.m.
DSL has been designed to cover LHS and RHS. You have two (or, perhaps,
three) options:
1) Define a simple DSL for the RHS, too. It could be as simple as
[then][] print {what}=System.out.println( {what} );
2) Prefix Java code lines with '>' - the expander will simply keep the rest.
If you can come up with a good use case for applying the DSL expansion only
to the LHS and let (or force) the rule author to write the RHS in Java
code, you could propose a patch for an expansion option "LHS only".
-W
On 12 December 2011 02:10, Zhao Yi <zhaoyi0113(a)gmail.com> wrote:
I want to convert my drl to dsl and dslr. I found that if I choose
using
dsl,
I couldn't write java code in rules any more. I must translate everything
in
dsl file. Can I combine dsl and drl in dslr file, like below rule. when I
am
using dsl, I will get an error: "[10] Unable to expand:
System.out.println("add caculation start");"
rule "add caculation"
agenda-group "add"
no-loop true
dialect "java"
lock-on-active
when
$m: Whether exist event
then
System.out.println("add caculation start");
System.out.println("add caculation end");
end
--
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11:29 a.m.
Laune
I was hoping that DSL was like a regex-based macro-substitution system ...
expanding only where it found matches. I don't believe this is an RHS vs
LHS issue ... the question is whether using DSL for one particular situation
should require you to use DSL for everything.
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11:49 a.m.
The fundamental idea is to use a DSL for LHS and RHS coding. That said:
if a DSLR line does not match one of your DSL phrases, how do you tell
a misspelled DSLR line from a Java line?
And there's the possibility of using > as an indication for Java.
-W
On 12/12/2011, ronalbury <ronalbury(a)gmail.com> wrote:
Laune
I was hoping that DSL was like a regex-based macro-substitution system ...
expanding only where it found matches. I don't believe this is an RHS vs
LHS issue ... the question is whether using DSL for one particular situation
should require you to use DSL for everything.
--
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3 comments
3 participants
participants (3)
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ronalbury -
Wolfgang Laun -
Zhao Yi