New subject: Combination of conditions doesn't work

Thursday, 7 April 2011

Hi Sariman,

The trick with "from entry-point", is quite unfamiliar to me. There might be
some problem with that, but I cannot tell by looking at it.

However, there are a few problems with the rules that you have printed out
for us.

1) The way I understand it, they do not do what they should be doing. You
said you do NOT want an action when all sensors evaluate to true. In your
case, you are evaluateing whether all sensors are false. This is pretty
useless if you already have a rule which evaluates the existence of at least
1 "true" sensor. The way I would put this is like this:

rule "Myrule"
	when
		#conditions
		sensorEvent1: SensorEvent(booleanValue == true)
		exists( SensorEvent(booleanValue == false) )
	then 
		#actions
end

2) There are some errors in your rule. No idea whether this is a copy/paste
or a read/type, so I will just point them out.
    - ";" is usually not needed in a LHS, I am not familiar with the from
entry-point syntax, but I assume it wouldn't be needed
    - There is a ")" in excess in one of your conditions

3) I don't think it makes sense to put your rules as you did in the second
example. Even if you are trying to examine whether those three sensors are
false.

On a personal note: what does from entry-point do? I must have overlooked it
in the documentation.

Regards,
Frank

sariman wrote:
...

 To keep it short, I have three sensors providing me some values every x
 seconds. I am running an algorithm over those values and getting at the
 end a single value for each sensor. Next I check if this value is
 greater/less than a threshold value and creating an object and setting its
 booelan value to true/false. The last part looks like this:

 SensorEvent sensorEvent = new SensorEvent ();
 		sensorEvent.setBoolean(booleanValue);
 		sensorEvent.setSensorID(sensorID);

 I want to do some actions if one of the sensors has "true" and this works.
 But I want no action if all sensors have "true". And this part doens't
 work. If I only check one of the sensors if it is "false" it is ok but the
 combination doesn't work. It means this case seems naver to happen. No
 exception or error but no system print either. Here is the code snippet
 from my rules file:

 declare SensorEvent
 	@role(event)
 end

 rule "All false"

 	when
 		#conditions
 		sensorEvent1	: SensorEvent(sensorID == 1 , booleanValue == false)	from
 entry-point "Default";
 		sensorEvent2	: SensorEvent(sensorID == 5 , booleanValue == false) )	from
 entry-point "Default";
 		sensorEvent3	: SensorEvent(sensorID == 6 , booleanValue == false)	from
 entry-point "Default";

 	then 
 		#actions
 		System.out.println(" All false!! -> ");

 end

 I run the engine in stream mode and every single value (or object) is
 being inserted after I receieved the value. I also tried this variant but
 it didn't work either:

 rule "All false"

 	when
 		#conditions
 		sensorEvent1	: SensorEvent(sensorID == 1 )	from entry-point "Default";
 		sensorEvent2	: SensorEvent(sensorID == 5 )	from entry-point "Default";
 		sensorEvent3	: SensorEvent(sensorID == 6 , booleanValue == false &&
 sensorEvent1.booleanValue == false && sensorEvent2.booleanValue == false))
 from entry-point "Default";

 	then 
 		#actions
 		System.out.println(" All false!! -> ");

 end

 Any suggestions?

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Re: [rules-users] Combination of conditions doesn't work