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3 April SOA: Services Oriented Architecture MDA: Model Driven Architecture SOA Is it just good architecture? Potential value Weaker designers Consistency across organizations Client-oriented Relationship Between Model and Code What is MDA? Modelling languages as declarative programming languages Higher level of abstraction Separation of design from implementation OMG Model Oriented Architecture Technologies Platforms Services Domains Program generation from models MDA is the latest Earlier CASE-tools in 1980’s object-oriented IDEs in 1990’s UML tools … Model Driven Architecture • New orientation for OMG activities – New step beyond the Object Management Architecture (OMA) • Models are centric! – Target middleware is not important! • Focus on Platform Independent Models (PIM) – Without middleware details • Abstract Platform Specific Models (PSM) – Including all middleware details • Define PIM to PSM transformations • Preserving PIM when new middleware appears! Building an MDA Application PlatformIndependent Model A Detailed Model, stating Pre- and PostConditions in Object Constraint Language, and Semantics in an action language Start with a PlatformIndependent Model (PIM) representing business functionality and behavior, undistorted by technology details. Generating Platform-Specific Model PlatformIndependent Model CORBA Model Map a PIM to Specific Middleware Technologies via OMG Standard Mappings MDA tool applies a standard mapping to generate PlatformSpecific Model (PSM) from the PIM. Code is partially automatic, partially hand-written. Mapping to Multiple Deployment Technologies PlatformIndependent Model CORBA Model Java/EJB Model Map a PIM to Many Middleware Technologies via OMG Standard Mappings XML/SOAP Model Other Model MDA tool applies an standard mapping to generate PlatformSpecific Model (PSM) from the PIM. Code is partially automatic, partially hand-written. Generating Implementations Map PSM to application interfaces, code, GUI descriptors, SQL queries, etc. PlatformIndependent Model CORBA Model CORBA Java/EJB Model XML/SOAP Java/EJB XML/SOAP Model Other Model Other MDA Tool generates all or most of the implementation code for deployment technology selected by the developer.