Domains/hu.bme.mit.inf.dslreasoner.domains.cps/src/hu/bme/mit/inf/dslreasoner/domains/cps/mdeo/TooLowAverageMemoryConstraint.xtend


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package hu.bme.mit.inf.dslreasoner.domains.cps.mdeo

import hu.bme.mit.inf.dslreasoner.domains.cps.CyberPhysicalSystem
import uk.ac.kcl.inf.mdeoptimiser.libraries.core.optimisation.IGuidanceFunction
import uk.ac.kcl.inf.mdeoptimiser.libraries.core.optimisation.interpreter.guidance.Solution

class TooLowAverageMemoryConstraint implements IGuidanceFunction {
	static val THRESHOLD = 0.25
	
	override getName() {
		"TooLowAverageMemory"
	}

	override computeFitness(Solution solution) {
		val cps = solution.model as CyberPhysicalSystem
		var double sumUtilization
		var int numHosts
		for (hostType : cps.hostTypes) {
			numHosts += hostType.instances.size
			for (host : hostType.instances) {
				val utilization = ResourceUtilizationUtil.getMemoryUtilization(host)
				sumUtilization += (utilization as double) / hostType.defaultMemory
			}
		}
		val averageUtilization = sumUtilization / numHosts
		val difference = THRESHOLD - averageUtilization
		if (difference > 0) {
			difference
		} else {
			0
		}
	}
}