6:04 p.m.
Hi there,
True, DSLs allows us to write rules (on DSRLs) in plain English, and
friendly enough for business people; but our use case requires business
people to write their own rules.
We found some support for this inside Guvnor. Guvnor's manual describe this
in:
1.4.2.4.1.2. Augmenting with DSL sentences
1.4.2.4.2. DSL rulesHowever, it appears once you include a "DSL Sentence" in
a Business rules with the guided editor, you can not modify (or build on
top) that row of the rule any further (forcing us to define the DSL Sentence
to be self contained since nothing can be added to that rule row through the
guided editor). Is this limitation going to be waived in the future?
Also, Augmenting with DSL sentences presents a 'form like' with data entries
for the rule author. This is good, but is it possible to make these data
entries 'combo boxes like' and actually provide to the rule author with a
list of options for each data entry? Something similar to the dynamic enum
support already in Guvnor.
Thanks in advance for your help/comments.
Best regards,
Jim
7:16 a.m.
Hi,
Which version of Drools/Guvnor are you using?
Since Guvnor 5.1.1 (or maybe 5.1) you are able to change the order of the
patterns (i.e. DSL Sentences) in the Guided Editor. Maybe this is not what
you are talking about. So a little bit of clarification will be appreciated.
If you want DSL sentences to present a combobox for certain DSL variable,
you can define it in your DSL. I think this is explained in Guvnor manual.
This thread could also help you:
http://drools-java-rules-engine.46999.n3.nabble.com/Guvnor-and-drools-imp...
Best Regards,
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Esteban Aliverti
- Developer @ http://www.plugtree.com
- Blog @ http://ilesteban.wordpress.com
2011/3/14 Jim West <jmwest532(a)gmail.com>
Hi there,
True, DSLs allows us to write rules (on DSRLs) in plain English, and
friendly enough for business people; but our use case requires business
people to write their own rules.
We found some support for this inside Guvnor. Guvnor's manual describe this
in:
1.4.2.4.1.2. Augmenting with DSL sentences
1.4.2.4.2. DSL rulesHowever, it appears once you include a "DSL Sentence"
in a Business rules with the guided editor, you can not modify (or build on
top) that row of the rule any further (forcing us to define the DSL
Sentence to be self contained since nothing can be added to that rule row
through the guided editor). Is this limitation going to be waived in the
future?
Also, Augmenting with DSL sentences presents a 'form like' with data
entries for the rule author. This is good, but is it possible to make these
data entries 'combo boxes like' and actually provide to the rule author with
a list of options for each data entry? Something similar to the dynamic enum
support already in Guvnor.
Thanks in advance for your help/comments.
Best regards,
Jim
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4:53 p.m.
Thanks Esteban for your reply.
I am now using Guvnor Version 5.2.0.M1, and also installed the mortgages
example package as per image:
http://drools-java-rules-engine.46999.n3.nabble.com/file/n2684013/creditR...
creditRating.png
In the inserted image I am trying to write a business rule that is using a
DSL sentence in the first line. Using an enum this DSL sentence helps the
business people to choose something valid for the application (this is
great!). However, I don't know how to make this first line more complex
using the guided editor.
For example, you can hover on the second line of the rule and click on it
and the shown dialog pop ups, allowing me to make this line more complex
through adding restrictions on a field, new formula, etc. I can't get a
similar dialog for the first line of the rule. I think I should be able,
otherwise how could I write an 'OR' condition between this 2 lines? I want
something like the following without adding the 'OR' into the DSL:
When the credit rating is AA OR there is a Bankruptcy...
Also, enums are displayed as a simple selection list (combo box) in the DSL
sentence. Is it possible to have multi-selection, effectively getting a list
of selected values to be used inside the rule?
Best regards,
Jim
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6:31 a.m.
Le 15/03/2011 22:53, jwest a écrit :
However, I don't know how to make this first line more complex
using
the guided editor.
For example, you can hover on the second line of the rule and click on
it and the shown dialog pop ups, allowing me to make this line more
complex through adding restrictions on a field, new formula, etc. I
can't get a similar dialog for the first line of the rule.
No you can't
... A DSL sentence stands for a whole condition (or
action). You can't really "add" contraints in it. One thing that could
work is to define DSL phrase starting with "-" (see documentation) and
add them just under the main DSL sentence. But careful using that, as
DSL phrase are not filtered according to their context, your DSL may
become complex and a bad usage (which becomes more and more frequent as
the DSL grows) will produce rules that does not compile, or worse, that
does silly things ...
I think I should be able, otherwise how could I write an 'OR'
condition between this 2 lines?
You must first create a "OR" condition
(something like "one of the
following is true :"), which will create a container for sub-conditions.
You can then insert the condition inside this "OR" container.
Also, enums are displayed as a simple selection list (combo box) in
the DSL sentence. Is it possible to have multi-selection, effectively
getting a list of selected values to be used inside the rule?
I don't think so
To gain flexibility on rules coding, you should consider not using DSL,
or use it when you are really forced to (it is my opinion, as discussed
in this thread :
http://drools-java-rules-engine.46999.n3.nabble.com/Who-writes-your-rules...)
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3 comments
4 participants
participants (4)
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Esteban Aliverti -
Jim West -
jwest
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Vincent Legendre