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 …

• 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!

Model Driven Architecture

Building an MDA Application

Start with a Platform-Independent Model (PIM) representing business functionality and behavior, undistorted by technology details.

Platform-Independent

Model

A Detailed Model, stating Pre- and Post-Conditions in Object

Constraint Language, and Semantics in an action language

Generating Platform-Specific Model

Platform-Independent

Model

Map a PIM to Specific Middleware

Technologies via OMG Standard Mappings

MDA tool applies a standard mapping to generate Platform-Specific Model (PSM) from the PIM. Code is partially automatic, partially hand-written.

CORBA Model

Mapping to Multiple Deployment Technologies

Platform-Independent

Model

CORBA Model

MDA tool applies an standard mapping to generate Platform-Specific Model (PSM) from the PIM. Code is partially automatic, partially hand-written.

Java/EJBModel

XML/SOAPModel

OtherModel

Map a PIM to Many Middleware

Technologies via OMG Standard Mappings

Generating Implementations

Platform-Independent

Model

CORBA Model

MDA Tool generates all or most of the implementation code for deployment technology selected by the developer.

Java/EJBModel

CORBA

XML/SOAP

Model

Java/EJB XML/SOAP Other

OtherModel

Map PSM to application interfaces, code, GUI

descriptors, SQL queries, etc.