Implementing this would require a detailed parsing of function bodies and more,
to get the runtime object into the scope of the static methods compiled from
DRL functions.

As it is, a minor improvement is possible with:

import org.drools.spi.KnowledgeHelper;

function void ins( KnowledgeHelper kh, Object... obj ){
    kh.insert( obj );
}

//...
then
    ins( drools, new Fact( ... ) );
end


2010/10/13 Swindells, Thomas <TSwindells@nds.com>

I’ve just been writing what should be a really simple function in my DRL.

What I wanted to do is to take an object in, construct another object from it and then insert both into working memory.

Eg.

function void insertBoth(Object1 object1) {

      insert(new Object2(object1));

      insert(object 1);

}

 

Rule XYZ

When

Then

                insertBoth(new Object1());

End

 

 

This didn’t work as expected however as it couldn’t find the method insert.

I then thought, ah maybe I need to use the kcontext global to access them

 

function void insertBoth(Object1 object1) {

      kcontext.insert(new Object2(object1));

      kcontext.insert(object 1);

}

 

Rule XYZ

When

Then

                insertBoth(new Object1());

End

 

This doesn’t work either so what I’ve had to do is:

 

function void insertBoth(KnowledgeContext kcontext, Object1 object1) {

      kcontext.getKnowledgeRuntime().insert(new Object2(object1));

      kcontext.getKnowledgeRuntime().insert(object 1);

}

 

Rule XYZ

When

Then

                insertBoth(kcontext, new Object1());

End

 

This is suddenly a lot more complicated than it needs to be.  Why can’t functions have the same access to the standard operations (insert, update, retract etc) and globals as rule actions currently do?

Should I raise an issue for this or am I missing something?

 

Thomas



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