well, if you have both room and thermometer asserted as seperate facts, you need to modify each one if you want their changes to be re-considered (not always the case).
The engine will then re-check all the combinations and create activations for modified facts - basically its the same as if you retracted and asserted those facts anew.
On 2/22/07, seeker <janko.dimitroff@dai-labor.de> wrote:
I have a fact which holds a reference to another fact. I wonder which one do
I have to modify in my RHS.
My Objects are Room and Thermometer. Room holds reference to Thermometer
(and that has a property describing the value).
When my rule fires I want to decrease the temperature level to simulate that
the room gets colder until a certain value A is reached. So the rule should
be called several times until the actual level equals A.
This works ONE time when I set the new value on Thermometer and modify
Thermometer, not reaching A (the rule isnt fired again).
But works as expected when I modify Room instead of Thermometer (rules is
fired several times).
I'm new to drools and wonder if that is desired or if I do something wrong.
To make things more confusing: When several rules met the same conditions,
does only one rule gets fired or do all get fired (as I read it from Figure
1.19 of the documention).
If I modify Room my other rules _dont_ get fired. When I had modified
Thermometer my other rules _do_ get fired.
Is there anyone who can shed a little light on that for me?
--
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