SCENE is a platform for situation management that leverages on JBoss Drools rule engine and its integrated Complex Event Processing features to natively support rule-based situation-awareness.
A situation is a complex event which endures over time as certain conditions involving relevant contexts hold. Such relevant contexts are qualified within a role or part by the very conditions held by them. Take John - an individual whose temperature is being measured over time. Anytime John's temperature is above 37.5 it qualifies him as a febrile person. We can refer the fever as a situation taking place with John taking the part of febrile on it.
The fever pattern can be described in DRL (Drools Rule Language) as:
declare Person
name: String
temperature: Double
end
declare Fever extends Situation
febrile: Person @part @key
end
rule Fever
@role(situation)
when
febrile: Person(temperature > 37.5)
then
SituationHelper.situationDetected(drools)
endIn order to fully describe a SCENE situation, one must declare a Situation kind (Fever) and specify its properties. The binding classifier @part tags a property as a role (e.g. febrile) to be matched in a further situation identification. There will be conditions in which an individual fulfill a part and the Situation rule entails them as patterns (e.g. what it takes to person turn into febrile). A property tagged as @part in the class must be referred as a binding in the situation rule so the engine knows how to assign every individual to the right part its taking in it.
SCENE offers a mean to describe situation patterns with features like generalization, composability, aggregation and temporal correlation over situations.
<repositories>
...
<repository>
<id>Scene repo</id>
<url>https://mymavenrepo.com/repo/BG5Za6vz3CyY7SaQjMOa/</url>
</repository>
</repositories><dependency>
<groupId>br.ufes.inf.lprm</groupId>
<artifactId>scene-core</artifactId>
<version>0.10.7</version>
</dependency>
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