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Bug
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Resolution: Done
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Critical
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None
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6.2.0.Final
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None
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None
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NEW
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NEW
Hello,
I want to configure Drools (CEP) to expire events when no longer needed. There are two scenarios:
==SCENARIO A==
I configured Event with no explicit expires. In this scenario, if there is a rule with temporal constraints, the expiration is automatically calculated based on the constrains. If there is a rule with no temporal constraints, the expiration is INFINITE. The following example shows the scenario:
dialect "mvel"
declare Event
@role(event)
end
rule "ExampleRule1"
when
( $a : Event(name == "event a")
then
System.out.println("ExampleRule1Triggered");
end
rule "ExampleRule2"
when
( $a : Event(name == "event a") ) and
( $b : Event((name == "event b") && (this after [1ms, 15s] $a)) )
then
System.out.println("ExampleRule2Triggered");
end
With the previous Event definition:
- If only ExampleRule1 loaded, expires INFINITE. Expected expires 0. ERROR?
- If ExampleRule1 loaded and ExampleRule2 loaded, expires 15s. Expected expires 15. OK!
To solve this situation a tried the following scenario:
== SCENARIO B==
I configured Event with explicit expires. In this scenario, if there is a rule with temporal constraints, the expiration is not taken into account because it is overriden by the explicit expires. The following example shows the scenario:
dialect "mvel"
declare Event
@role(event)
@expires(0s)
end
rule "ExampleRule1"
when
( $a : Event(name == "event a")
then
System.out.println("ExampleRule1Triggered");
end
rule "ExampleRule2"
when
( $a : Event(name == "event a") ) and
( $b : Event((name == "event b") && (this after [1ms, 15s] $a)) )
then
System.out.println("ExampleRule2Triggered");
end
With the previous Event definition:
- ExampleRule1 is triggered and event removed. OK!
- ExampleRule2 is not triggered inserting two events because the first one expires. ERROR?
I suppose that SCENARIO B is not factible because explicit expires overrides implicit expires (according to issue DROOLS-586).
Could you please help me to solve this situation? Should Drools set inferred expiration time to 1ms when there are rules with no temporal constraints?