2. What is Eclipse ? Eclipse is a Java IDE Eclipse is an IDE Framework Eclipse + JDT = Java IDE First class framework for Java Language aware editor Incremental build Integrated debugging Eclipse + CDT = C/C++ IDE First class framework for C/C++ Language aware editor Refactoring, search Eclipse + PHP = PHP IDE Eclipse + JDT + CDT + PHP = Java, C/C++, PHP IDE ………….
3. Plug-in Plug-in Plug-in Eclipse is a Tools Framework Tools extend the Eclipse platform using plug-ins Business Intelligence and Reporting Tools (BIRT) Eclipse Communications Framework (ECF) Web Tools Project (WTP) Eclipse Modelling Framework (EMF) Graphical Editing Framework (GEF) Test and Performance Tooling Project (TPTP
4. Eclipse is a Application Framework Remove the IDE elements, Java language support, team development support, … and you’re left with a pretty comprehensive general application framework Support for multiple platforms Linux, Windows, Mac OSX, UNIX, embedded Rich widget set, graphics Native-OS integration (drag and drop, OLE/XPCOM integration) A platform for rich clients
5. Eclipse is all these things A Java IDE An IDE Framework A Tools Framework An Application Framework An Open Source Enabler A community An eco-system A foundation
6. Model Driven Architecture (MDA) • A software architecture proposed by the OMG (Object Management Group) • Application specified in high-level, Platform Independent Model (PIM) • Transformation technologies used to convert PIM to Platform Specific Model (PSM), implementation code • Includes several open modeling standards: UML™ (Unified Modeling Language) MOF (Meta-Object Facility) XMI (XML Metadata Interchange) CWM (Common Warehouse Model)
7. What is EMF ? EMF is a simple, pragmatic approach to modeling: Allows us to generate some of the code that we write over and over, paving the way for more complex systems Models are simple, but meant to be mixed with hand-written code It’s real, proven technology (since 2002)
10. generator for Java Implementation of your ModelEMF is a framework converting various forms of model into core model description called Ecore
11. Why EMF ? EMF is middle ground in the modeling vs. programming worlds Focus is on class diagram subset of UML modeling (object model) Transforms models into Java code Provides the infrastructure to use models effectively in your application Very low cost of entry EMF is free and open source Full scale graphical modeling tool not required Reuses your knowledge of UML, XML Schema, or Java It’s real, proven technology (since 2002)
19. EMF Components • Core Runtime Notification framework Ecore meta model Persistence (XML/XMI), validation, change model • EMF.Edit Support for model-based editors and viewers Default reflective editor • Codegen Code generator for application models and editors Extensible model importer/exporter framework
22. Model Sources • EMF models can be defined in (at least) three ways: 1. Java Interfaces 2. UML Class Diagram 3. XML Schema
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24. Java Interfaces public interface Item { String getProductName(); void setProductName(String value); intgetQuantity(); void setQuantity(int value) float getPrice(); void setPrice(float value); } public interface PurchaseOrder { String getShipTo(); void setShipTo(String value); String getBillTo(); void setBillTo(String value); List getItems(); // List of Item } • Classes can be defined completely by a subset of members, supplemented by annotations
25. UML Class Diagram • Built-in support for Rational Rose® • UML2 support available with UML2 (from MDT)
31. Generated Model Code • Interface and implementation for each modeled class Includes get/set accessors for attributes and references Interface public interface PurchaseOrder extends EObject { String getShipTo(); void setShipTo(String value); String getBillTo(); void setBillTo(String value); EList<Item> getItems(); } Implementation Class public class PurchaseOrderImpl extends EObjectImpl implements PurchaseOrder { ... }
32. Change Notification • Every EObject is also a notifier Sends notification whenever an attribute or reference is changed Observers can update views, dependent objects Observers are also adapters Adapter Adapter adapter = ... purchaseOrder.eAdapters().add(adapter);
33. Factories and Packages • Factory to create instances of model classes • Package provides access to metadata POFactory factory = POFactory.eINSTANCE; PurchaseOrder order = factory.createPurchaseOrder(); POPackagepoPackage = POPackage.eINSTANCE; EClassitemClass = POPackage.Literals.ITEM; //or poPackage.getItem() EAttributepriceAttr = POPackage.Literals.ITEM__PRICE; //or poPackage.getItem_Price() //or itemClass.getEStructuralFeature(POPackage.ITEM__PRICE)
34. Persistence • Persisted data is referred to a resource • Objects can be spread out among a number of resources, within a resource set • Proxies represent referenced objects in other resources
35. Resource Set • Context for multiple resources that may have references among them • Usually just an instance of ResourceSetImpl • Provides factory method for creating new resources in the set ResourceSetrs = new ResourceSetImpl(); URI uri = URI.createFileURI("C:/data/po.xml"); Resource resource = rs.createResource(uri); • Also provides access to the registries, URI converter and default load options for the set
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39. Based on URI scheme, filename extension or content type
42. Used during loading to access factory for instantiating classes
43. If no registered package found locally, delegates to global registry: EPackage.Registry.INSTANCE
44. Reflective EObject API • All EMF classes implement EObject interface • Provides an efficient API for manipulating objects reflectively Used by framework (e.g. persistence framework, copy utility, editing commands) public interface EObject { EClasseClass(); Object eGet(EStructuralFeaturesf); void eSet(EStructuralFeaturesf, Object val); ... }
45. Reflective EObject API • Efficient generated switch-based implementation of reflective methods public Object eGet(intfeatureID, ...) { switch (featureID) { case POPackage.PURCHASE_ORDER__ITEMS: return getItems(); case POPackage.PURCHASE_ORDER__SHIP_TO: return getShipTo(); case POPackage.PURCHASE_ORDER__BILL_TO: return getBillTo(); ... } ... }
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47. Regeneration and Merge • The EMF generator is a merging generator /** * <!-- begin-user-doc --> * <!-- end-user-doc --> * @generated */ public String getName() { return name; } •@generated elements are replaced/removed • To preserve changes mark @generated NOT
48. Recording Changes EMF provides facilities for recording the changes made to instances of an Ecore model Change Model An EMF model for representing changes to objects Directly references affected objects Includes “apply changes” capability Change Recorder EMF adapter Monitors objects to produce a change description (an instance of the change model)
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50. Change Recorder Can be attached to EObjects, Resources, and ResourceSets Produces a description of the changes needed to return to the original state (a reverse delta) PurchaseOrder order = ... order.setBillTo("123 Elm St."); ChangeRecorder recorder = new ChangeRecorder(); recorder.beginRecording(Collections.singleton(order)); order.setBillTo("456 Cherry St."); ChangeDescription change = recorder.endRecording(); Result: a change description with one change, setting billTo to “123 Elm St.”
51. Diagnostician • Diagnostician walks a containment tree of objects, dispatching to package-specific validators Diagnostician.validate() is the usual entry point Detailed results accumulated as Diagnostics Diagnostician validator = Diagnostician.INSTANCE; Diagnostic diagnostic = validator.validate(order); if (diagnostic.getSeverity() == Diagnostic.ERROR) { // handle error } for (Diagnostic child : diagnostic.getChildren()) { // handle child diagnostic }
53. Resources • EMF documentation in Eclipse Help Overviews, tutorials, API reference • EMF project Web site http://www.eclipse.org/modeling/emf/ Downloads, documentation, FAQ,newsgroup, Bugzilla, Wiki • Eclipse Modeling Framework, by Frank Budinsky Ed Merks
