Exploration.alg: Exponential penalty funcion for NoEmptyPartitionConstraint.

* Using exponential functions for the penalty calculation of constraints is common practice and favored over pure potential functions.
refs 3257

org.fortiss.af3.exploration.alg/trunk/src/org/fortiss/af3/exploration/alg/dse/evaluator/constraint/.ratings

@@ -4,7 +4,7 @@ ConstraintEvaluatorBase.java 4a0e50681708c882bf314d689e1ddce322d0cd50 RED
 DeadlineConstraintEvaluator.java 6763810616860bd149f90a653776276681ee480e RED
 IConstraintEvaluator.java bca49bbdea5e089b0d045fc356ceedcb466df55e RED
 MappingEvaluatorConstraint.java f1f44bffbef03f1650a7f026428423838b16b845 RED
-NoEmptyPartitionConstraintEvaluator.java 33f7b4215b2ada1e60474e9385150a9ea234b060 YELLOW
+NoEmptyPartitionConstraintEvaluator.java 0cd05407f2c2958c5c26d4497b6fdca84c03ad3e YELLOW
 PeriodConstraintEvaluator.java 05cf21be06c9ae12593f870efdf9c358efa2d97c RED
 SafetyIntegrityLevelConstraintEvaluator.java 9ad7129faaa35d89af4fced7a7121a0a142cb6f1 RED
-SameSilInPartitionConstraintEvaluator.java 9f30f5731fb64b73ab2c50868026e9d1af05beb5 RED
+SameSilInPartitionConstraintEvaluator.java 571c4f092ea59266d2bcd4870f2297dfc9ae1ad2 RED

org.fortiss.af3.exploration.alg/trunk/src/org/fortiss/af3/exploration/alg/dse/evaluator/constraint/NoEmptyPartitionConstraintEvaluator.java

@@ -15,8 +15,6 @@
 +--------------------------------------------------------------------------*/
 package org.fortiss.af3.exploration.alg.dse.evaluator.constraint;
 
-import static java.lang.Math.pow;
-
 import java.util.ArrayList;
 import java.util.Collection;
 
@@ -55,7 +53,7 @@ public class NoEmptyPartitionConstraintEvaluator extends
 		Collection<Partition> emptyPartitions =
 				LambdaUtils.filter(virtMapping.getRequesters(), res -> phenotype.getRequesters(res)
 						.isEmpty());
-		return new DoubleValue(pow(10 * emptyPartitions.size(), 2));
+		return new DoubleValue(Math.expm1(emptyPartitions.size()));
 	}
 
 	/** {@inheritDoc} */