[rules-users] Guvnor and drools implementation - questions

[Vincent Legendre]

For your problem of different instances of a map : If you want to match 
2 maps, and compare them, your have to set a placeholder in your DSL to 
set the variable's name
[when]The property {key:ENUM:Map.properties} of the map *{mapVar}* is 
{value}=*{mapVar} *: Map((this["{key}"] == "{value}"))

**And another DSL phrase to check that instances are different
[when]The map *{mapVar1}* is not map *{mapVar2}*=*eval ({mapVar1}*["id"] 
!= *{mapVar2}*["id"]))*
*
But it will force your users to handle variables. I can't see simpler 
way for doing that with DSL.

You may consider completely another way. If your property lists are 
constant (and they are because you can create static enums), you can 
write a simple program to generate the corresponding POJOs (which 
contains the map inside them and use it in set/get methods for 
corresponding key) and create a jar with them.
Each POJO will then have its fields listed automatically in Guided 
Editor, which will prevent you for writing complex DSL and enums, and 
provide a good way for users to edit rules. For instance, you can bind 
an object to a variable only if you need it (with DSL you are forced to 
bind a variable at each time you use the phrase), and you can use other 
operator (not only equals) without writing a new DSL phrase.


I did not understand this question :

> I have to put my rules in 4 drl files separate (i know which rules go 
> in which drl file), is the only way to create a different package for 
> each drl file i want? And to put the Enum and DSL part in Global if i 
> have to use it for the 4 files? If i want a precise name for my drl 
> file, i have to give this exact name to the package?
But yes, a DSL (and enums) is specific to its package.

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