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CSC509 Lecture 06

CSC509 Lecture 06

Software Design
Eclipse Modeling Tool
(202310)

Javier Gonzalez-Sanchez

October 26, 2023
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  1. jgs CSC 509 Software Engineering II: Modeling and Design Lecture

    06: Eclipse Modeling Tool Dr. Javier Gonzalez-Sanchez [email protected] www.javiergs.com Building 14 -227 Office Hours: By appointment
  2. jgs Javier Gonzalez-Sanchez | CSC 509 | Fall 2023 |

    3 § Gamma, E., Helm, R., Johnson, R. E. & Vlissides, J. (1993). Design Patterns: Abstraction and Reuse of Object-Oriented Design. Proceedings of the European Conference on Object-Oriented Programming, 707, 406– 431. § Garlan, D. & Shaw, M. (1994). An Introduction to Software Architecture (CMU Software Engineering Institute). CMU Software Engineering Institute. Homework :: Read
  3. jgs Javier Gonzalez-Sanchez | CSC 509 | Fall 2023 |

    8 Definition Model-driven software development (MDD) § Write and implement software quickly, effectively and at minimum cost. § The approach focuses on the construction of a software model. § The model (text or graphic) specifies how the software system should work before the code is generated. § The software is created automatically (translate the model to code) § Tested and then deployed.
  4. jgs Javier Gonzalez-Sanchez | CSC 509 | Fall 2023 |

    9 MDD Development Process http://www.theenterprisearchitect.eu/blog/2009/08/05/a-metaphor-for-model-driven-engineering/
  5. jgs Javier Gonzalez-Sanchez | CSC 509 | Fall 2023 |

    15 Eclipse § Eclipse is a universal platform for integrating development tools § Architecture based on plug-ins § SWT (Standard Widget Toolkit) is a generic graphics and GUI widget set § JFace is set of UI frameworks for common UI tasks § Workbench and Workspace are core – Editors, Views, and Perspectives
  6. jgs Javier Gonzalez-Sanchez | CSC 509 | Fall 2023 |

    16 Eclipse Modeling Framework 2. Model specification (it is stored as XMI but defined as text or diagram). A subset of UML class diagrams semantics 1. EMF provides tools and runtime environment. 3. Translate to Java Classes and Interfaces
  7. jgs Javier Gonzalez-Sanchez | CSC 509 | Fall 2023 |

    17 Download Eclipse Modeling Tools
  8. jgs Javier Gonzalez-Sanchez | CSC 509 | Fall 2023 |

    20 Model UML Class Diagram Description
  9. jgs Javier Gonzalez-Sanchez | CSC 509 | Fall 2023 |

    21 Step 1 :: Project § Create an empty modeling project in your workspace File → New → Other… and choose Empty EMF Project § Click Next, enter a name for the project, e.g., org.eclipse.example.mymodel, and hit Finish
  10. jgs Javier Gonzalez-Sanchez | CSC 509 | Fall 2023 |

    22 Step 2 :: Model § Please right click the model folder in your new modeling project then New → Other… → Ecore Model, then click Next and give the ecore file the name myModel.ecore. § It will open in the default Ecore editor, which allows the definition of Ecore models in a tree-based view
  11. jgs Javier Gonzalez-Sanchez | CSC 509 | Fall 2023 |

    23 Step 2 :: Model :: Package § Give the package of your new model a name and an URI. This will be done in the properties view. The URI is used to identify the model later. Name the package myModel, Set the Ns Prefix to org.eclipse.example.myModel and the Ns URI to https://org/eclipse/example/myModel.
  12. jgs Javier Gonzalez-Sanchez | CSC 509 | Fall 2023 |

    24 Step 2 :: Model :: Classes and Attributes § Define model elements as children of the root package by right clicking on the myModel package and on the EClass respectively Add EClass as children, New Child → EClass Add EAttribute as children, New Child → EAttribute
  13. jgs Javier Gonzalez-Sanchez | CSC 509 | Fall 2023 |

    25 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”
  14. jgs Javier Gonzalez-Sanchez | CSC 509 | Fall 2023 |

    26 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
  15. jgs Javier Gonzalez-Sanchez | CSC 509 | Fall 2023 |

    29 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.
  16. jgs Javier Gonzalez-Sanchez | CSC 509 | Fall 2023 |

    30 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
  17. jgs Javier Gonzalez-Sanchez | CSC 509 | Fall 2023 |

    31 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”.
  18. jgs Javier Gonzalez-Sanchez | CSC 509 | Fall 2023 |

    33 Step 3 :: Generate Code Could you create a class diagram for the package myModel?
  19. jgs Javier Gonzalez-Sanchez | CSC 509 | Fall 2023 |

    36 § 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
  20. jgs Javier Gonzalez-Sanchez | CSC 509 | Fall 2023 |

    37 § 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();
  21. jgs Javier Gonzalez-Sanchez | CSC 509 | Fall 2023 |

    38 Interfaces package myModel; public interface Course extends EObject { String getName(); void setName(String value); EList<Student> 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); }
  22. jgs Javier Gonzalez-Sanchez | CSC 509 | Fall 2023 |

    39 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 ... }
  23. jgs Javier Gonzalez-Sanchez | CSC 509 | Fall 2023 |

    40 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<Student> 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 ...
  24. jgs Javier Gonzalez-Sanchez | CSC 509 | Fall 2023 |

    41 Classes :: Course @Override public EList<Student> getStudents() { if (students == null) { students = new EObjectContainmentEList<Student> (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(); } }
  25. jgs Javier Gonzalez-Sanchez | CSC 509 | Fall 2023 |

    42 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; } }
  26. jgs Javier Gonzalez-Sanchez | CSC 509 | Fall 2023 |

    43 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
  27. jgs Javier Gonzalez-Sanchez | CSC 509 | Fall 2023 |

    46 Assignment UML Class Diagram 1. Define the Model in EMF (take a screen shoot) 2. Generate Code (take a screen shoot) 3. Use the Code to Create a Class Diagram (only the Model package but include both interfaces and implementations). It will be bigger and more complex that the one provided
  28. jgs Javier Gonzalez-Sanchez | CSC 509 | Fall 2023 |

    48 Reference § Eclipse Modeling Framework by Frank Budinsky § EMF project on eclipse.org
  29. jgs CSC 509 Software Design Javier Gonzalez-Sanchez, Ph.D. [email protected] Fall

    2023 Copyright. These slides can only be used as study material for the class CSC509 at Cal Poly. They cannot be distributed or used for another purpose.