SCENE Platform

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)
end

In 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.

Features

SCENE offers a mean to describe situation patterns with features like generalization, composability, aggregation and temporal correlation over situations.

Instalation

Maven

<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>