CSE460 Lecture 35

Software Analysis and Design
Eclipse Modeling Framework
(202011)

Transcript

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   CSE 460
   Software Analysis and Design
   Lecture 35: Eclipse Modeling Framework
   Dr. Javier Gonzalez-Sanchez
   javiergs@asu.edu
   javiergs.engineering.asu.edu | javiergs.com
   PERALTA 230U
   Office Hours: By appointment
   

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2. Javier Gonzalez-Sanchez | CSE564 | Fall 2020 | 2
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   MDD Development Process
   

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3. Javier Gonzalez-Sanchez | CSE564 | Fall 2020 | 3
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   Model
   UML Class Diagram
   Description
   

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4. Javier Gonzalez-Sanchez | CSE564 | Fall 2020 | 8
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   Step 2 :: Model :: Relationships
   § EReference between Course and Student, New Child → EReference
   EType of the reference to “Student”
   upper bound to “-1”, the equivalent of “many”.
   set the property Containment to “true”
   

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5. Javier Gonzalez-Sanchez | CSE564 | Fall 2020 | 9
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   Step 2 :: Model :: Relationships
   § EReference between Student and Computer, New Child → EReference
   EType of the reference to “Computer”
   upper bound to “1” (default)
   set the property Containment to “false”
   § Save all
   

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   2. Code Generation
   

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7. Javier Gonzalez-Sanchez | CSE564 | Fall 2020 | 11
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   Eclipse Modeling Framework
   

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8. Javier Gonzalez-Sanchez | CSE564 | Fall 2020 | 12
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   Generator Model
   § Create a generator model. This allows to configure properties for the code
   generation that are not part of the model itself.
   § Generate a maximum of four different plugins for a defined model:
   1. Model plugin contains all entities, packages and factories to create instances of
   the model.
   2. Edit plugin contains providers to display a model in a UI. For example, the
   providers offer a label for every model element, which can be used to display an
   entity showing an icon and a name.
   3. Editor plugin is a generated example editor to create and modify instances of a
   model.
   4. Test plugin contains templates to write tests cases for a model.
   

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9. Javier Gonzalez-Sanchez | CSE564 | Fall 2020 | 13
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   Step 3 :: Generate Code
   § Right click the model folder in the project then
   § New → Other… → EMF Generator Model → Next
   § and enter myModel.genmodel as the file name.
   § Select Ecore model as the model importer.
   § select Browse Workspace… and select our previously created myModel.ecore
   

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10. Javier Gonzalez-Sanchez | CSE564 | Fall 2020 | 14
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    Step 3 :: Generate Code
    § Based on the generator model, we can now generate the source code.
    § EMF allows you to generate 4 different plugins.
    § To generate the plugins, right-click on the root node of the genmodel and
    select the plugin. For our tutorial, please select “generate all”.
    

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11. Javier Gonzalez-Sanchez | CSE564 | Fall 2020 | 16
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    Step 3 :: Generate Code
    

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    3. Code
    

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13. Javier Gonzalez-Sanchez | CSE564 | Fall 2020 | 18
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    Code
    § There following is generated
    § Java interface (Package)
    § Java implementation class (Package.Impl)
    § Factory interface and implementation class (Package.Util)
    Also,
    § Edit (View)
    § Editor
    § Test
    

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14. Javier Gonzalez-Sanchez | CSE564 | Fall 2020 | 19
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    Code
    § 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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15. Javier Gonzalez-Sanchez | CSE564 | Fall 2020 | 20
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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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16. Javier Gonzalez-Sanchez | CSE564 | Fall 2020 | 21
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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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17. Javier Gonzalez-Sanchez | CSE564 | Fall 2020 | 22
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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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18. Javier Gonzalez-Sanchez | CSE564 | Fall 2020 | 23
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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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19. Javier Gonzalez-Sanchez | CSE564 | Fall 2020 | 24
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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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20. Javier Gonzalez-Sanchez | CSE564 | Fall 2020 | 25
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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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    To be continued…
    

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22. Javier Gonzalez-Sanchez | CSE564 | Fall 2020 | 27
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    Reference
    § Eclipse Modeling Framework by Frank Budinsky
    § EMF project on eclipse.org
    

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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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