CSE564 Lecture 25

Software Design
Model-Driven Development II
(202211)

Transcript

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   CSE 564
   Software Design
   Lecture 24: Model-Driven Development II
   Dr. Javier Gonzalez-Sanchez
   javiergs@asu.edu
   javiergs.engineering.asu.edu | javiergs.com
   PERALTA 230U
   Office Hours: By appointment
   

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   Previously …
   

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   MDD Development Process
   

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   Model
   UML Class Diagram
   Description
   

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   Eclipse Modeling Framework
   

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   3. Code
   

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   § For each class in your model, there is a corresponding generated
   § Java interface
   § Java implementation class
   § For each package, there is a
   § XXXPackage interface and implementation class
   § XXXFactory interface and implementation class
   

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   § These are singletons, to access the instances use
   § XXXPackage.eINSTANCE
   § XXXFactory.eINSTANCE
   § Use the Factory to create instances of your model classes, e.g:
   TaskList t = ExampleFactory.eINSTANCE.createTaskList();
   § Use the Package to access the meta-model definition, e.g:
   EClass c = ExamplePackage.eINSTANCE.getTaskList();
   List attrs = c.getEAttributes();
   

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   Interfaces
   package myModel;
   public interface Course extends EObject {
   String getName();
   void setName(String value);
   EList getStudents();
   }
   public interface Student extends EObject {
   String getName();
   void setName(String value);
   int getGpa();
   void setGpa(int value);
   boolean isHasScholarship();
   void setHasScholarship(boolean value);
   Computer getComputer();
   void setComputer(Computer value);
   }
   public interface Computer extends EObject {
   String getBrand();
   void setBrand(String value);
   }
   

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    Interfaces
    package myModel;
    public interface MyModelFactory extends EFactory {
    MyModelFactory eINSTANCE = myModel.impl.MyModelFactoryImpl.init();
    Course createCourse();
    Student createStudent();
    Computer createComputer();
    MyModelPackage getMyModelPackage();
    }
    public interface MyModelPackage extends EPackage {
    String eNAME = "myModel";
    String eNS_URI = "https://org/eclipse/example/myModel";
    String eNS_PREFIX = "org.eclipse.example.myModel";
    MyModelPackage eINSTANCE = myModel.impl.MyModelPackageImpl.init();
    // more ...
    }
    

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    Classes :: Course
    package myModel.impl;
    public class CourseImpl extends MinimalEObjectImpl.Container implements Course {
    protected static final String NAME_EDEFAULT = null;
    protected String name = NAME_EDEFAULT;
    protected EList students;
    protected CourseImpl() {
    super();
    }
    @Override
    protected EClass eStaticClass() {
    return MyModelPackage.Literals.COURSE;
    }
    @Override
    public String getName() {
    return name;
    }
    @Override
    public void setName(String newName) {
    String oldName = name;
    name = newName;
    if (eNotificationRequired())
    eNotify(new ENotificationImpl(this, Notification.SET, MyModelPackage.COURSE__NAME, oldName, name));
    }
    // continue ...
    

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    Classes :: Course
    @Override
    public EList getStudents() {
    if (students == null) {
    students = new EObjectContainmentEList
    (Student.class, this, MyModelPackage.COURSE__STUDENTS);
    }
    return students;
    }
    // more ...
    @Override
    public String toString() {
    if (eIsProxy()) return super.toString();
    StringBuilder result = new StringBuilder(super.toString());
    result.append(" (name: ");
    result.append(name);
    result.append(')’);
    return result.toString();
    }
    }
    

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    Classes :: Student
    package myModel.impl;
    public class StudentImpl extends MinimalEObjectImpl.Container implements Student {
    protected boolean hasScholarship = HAS_SCHOLARSHIP_EDEFAULT;
    protected Computer computer;
    @Override
    public void setComputer(Computer newComputer) {
    Computer oldComputer = computer;
    computer = newComputer;
    if (eNotificationRequired())
    eNotify(new ENotificationImpl
    (this, Notification.SET, MyModelPackage.STUDENT__COMPUTER, oldComputer, computer));
    }
    @Override
    public Computer getComputer() {
    if (computer != null && computer.eIsProxy()) {
    InternalEObject oldComputer = (InternalEObject)computer;
    computer = (Computer)eResolveProxy(oldComputer);
    if (computer != oldComputer) {
    if (eNotificationRequired())
    eNotify(new ENotificationImpl
    (this, Notification.RESOLVE, MyModelPackage.STUDENT__COMPUTER, oldComputer, computer));
    }
    }
    return computer;
    }
    }
    

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    Why is This Better than Writing POJOs?
    § plain old Java object (POJO)
    § We have generated over 1,000 LOC,
    § Even very simple code is considered to be worth $1 per LOC. So, $1,000
    just by clicking some buttons
    

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    4. Testing
    

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    Test Cases
    § Generated test class for all the entities of your model.
    § Add methods starting with “test” to create single test cases.
    § Run test cases with a right-click on the test class then.
    “Debug As” => “JUnit Test”.
    In this context, test cases are very simple way of exploring and using the
    API of the generated classes.
    

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    Test Cases
    package myModel.tests;
    import junit.framework.TestCase;
    import junit.textui.TestRunner;
    import myModel.Course;
    import myModel.MyModelFactory;
    import myModel.Student;
    public class CourseTest extends TestCase {
    public static void main(String[] args) {
    TestRunner.run(CourseTest.class);
    }
    public CourseTest(String name) {
    super(name);
    }
    // more ...
    }
    

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    Test Cases
    § Use the MyModelFactory to create a Course and a Student
    public class CourseTest extends TestCase {
    // original code...
    public void testCourseStudentReference() {
    Course course = MyModelFactory.eINSTANCE.createCourse();
    Student s1 = MyModelFactory.eINSTANCE.createStudent();
    course.getStudents().add(s1);
    assertEquals(course.getStudents().get(0), s1);
    }
    }
    

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    Test Cases
    

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    Assignment 05 EMF
    

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    Assignment
    UML Class Diagram
    1. Define the Model in EMF (take a
    screen shoot)
    2. Use the Code to Create a Class
    Diagram (only the Model and Test
    packages and include both interfaces
    and implementations).
    It will be bigger and more complex
    that the one provided
    3. Create a document with the screen
    shoot of your model and your UML
    diagram. The diagram is going to be
    bigger and different from the one used
    as input!
    Car
    Engine
    Wheel
    

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    5. Customize
    

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    Frameworks
    For storing and versioning EMF model instances:
    § EMFStore (Model Repository)
    § CDO (Model Repository)
    § Teneo (Database Back-end)
    For Views:
    § EMF UI
    § EMF Listener
    § EMF Forms.
    § Graphiti (Graphical Editor)
    § Graphical Modeling Framework (Graphical Editor)
    § Extended Editing Framework (Advanced Property View)
    

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    Reference
    § Eclipse Modeling Framework by Frank Budinsky
    § EMF project on eclipse.org
    

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    One last thing
    Structural Complexity
    

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    Example
    

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    • Instability = Cout
    (Cin + Cout)
    Stable Abstraction Principle (SAP)
    

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    Distance
    § Distance: how far a package is away from
    the Main Sequence
    § D = A + I – 1
    § Values -1 to 1
    § Absolute Distance |D|
    

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    Example
    ITeamA
    = 6 / 0 + 6 = 1
    ATeamA
    = 0
    DTeamA
    = 0 + 1 – 1 = 0
    IJlabel
    = 0 / 4 + 0 = 0
    AJlabel
    = 0
    DJlabel
    = 0 + 0 – 1 = -1
    |Djlabel
    | = 1
    Pain Zone (just an example!)
    

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    Stable Dependency Principle (SDP)
    § Every dependency between modules should terminate on a module whose
    Instability is less than or equal to the depending
    module's Instability.
    § Every dependency between modules should terminate on a module whose
    Abstractness is greater than or equal to the depending
    module's Abstractness.
    

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    Example
    MyNewClass
    OtherClass
    

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    Questions
    

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    CSE 564 Computer Systems Fundamentals
    Javier Gonzalez-Sanchez
    javiergs@asu.edu
    Fall 2020
    Disclaimer. These slides can only be used as study material for the class CSE564 at ASU. They cannot be distributed or used for another purpose.
    

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