DSL

• basepath - This refers to the basepath relative to the project root, where the optimisation artifacts can be found.

• metamodel - This specifies the name of the ecore metamodel file. The filename is relative to the basepath. Using this keyword it is possible to also specify the namespace of an EPackage class that can be instantiated to load the metamodel at runtime. Refer to the Resource Allocation case study for an example.

• model - This specifies the input model file name, relative to the basepath

• initialise - This keyword allows the user to define a custom class that will be used to initialise each of the initial population individuals. For an example implementation please refer to the Resource allocation case study.

• objective - This specifies the objective function. The objective can be specified using OCL or Java/XTend by implementing the IGuidanceFunction interface.

• constraint - This specifies the constraint to be used during the optimisation. The constraint can be specified using OCL or Java/XTend by implementing the IGuidanceFunction.

• mutate - This specifies the Henshin mutation rule to be used during the search.

• breed - This specifies the Henshin breeding rule to be used during the search. The different between mutate and breed is that breed takes two parents as input as opposed to one for mutate

• optimisation - This specifies the optimsation algorithm configuration.

Manual mutation operators

The mutate keyword can be used to specify predefined mutation operators implemented using Henshin. The tool supports both rules and units.

Automatic mutation generation

MDEOptimiser can also be used to automatically generate atomic mutation operators that can create, delete a node and add, remove, change or swap an edge.

The syntax to do this is the following:

• mutate {Node} - This specifies that the tool should generate all the combinations of mutation operators for the specified node.
• mutate {Node, edge} - This specifies that the tool should generate all the combinations of mutation operators for the edge edge for node Node.