model driven

Using
Model-Driven Development
& Eclipse Technology
to implement SOA

Tas Frangoullides
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Overview

• What is Model-Driven Development (MDD)

• Challenges of SOA
• Our Solution
• Getting There
• Summary and Tips
• Questions
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What is...

MODEL-DRIVEN DEVELOPMENT?
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Model-Driven Development

Source Code

Model Generators Data Schemas

Presentation
Artefacts
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Benefits of MDD

Raises the level

of abstraction
Can target
multiple
platforms

Reduces
development
times
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Implementing Service-Oriented Architecture

THE CHALLENGES
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Challenges of SOA
• Promoting effective communication of details between
business-IT teams
• Ensuring semantic interoperability between enterprise
services
• Successful adoption of standards and best-practice
• Retaining independence from platforms and vendors
• Maintaining a good degree of architectural agility
• Getting developers up to speed and helping them
adopt technology, best-practice and new platforms
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Applying Model-Driven Development and Eclipse Technology

OUR SOLUTION
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Enterprise Data

Within an Enterprise Application Outside an Enterprise Application

Common
Domain Model Integration
Data Model
Source
EWS
Services
Data
Source

Enterprise Web Service

maps between the two
worlds of data
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Common Integration Model

• Representative of an
Enterprise business domain
Common • Common vocabulary between
Integration
Model
systems and people
EWS • Used to constrain the
structure of data used in
Enterprise Services
• Should be influenced by
multiple business units
• Should not be adopted
internally by systems
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From domain model to service

Describes business entities
and the relationships Domain Global
between them Model Website

Constraint

Describes units of
information which may be Message
XSD Java
+ Bindings
communicated between Model
systems

Use by
reference
Describes SOA service
interfaces in a platform- Service Deployable
independent manner Model Web Service
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Web Service Generation

Eclipse
Service Web Project
Model

WSDL

XML Schemas

Java Binding for XML

Java Interface & Implementation Skeleton

Deployment Descriptor

Ivy Configuration (Dependency Management)

Ant build.xml (for Jumpstart)

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Web Service Generation

Eclipse
Service Web Project
Model

X-Fire Sonic
Project ESB Project
Services
Framework Sonic Process
Configuration

Spring Deployment Manager

Configuration Model Files
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Benefits

• Use of models dramatically improved

communication across the enterprise
• Agile Architecture
• Platform Independence
• Conformance to standard data model
• Development times for new services
significantly improved
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EXAMPLE MODELS
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Domain Model
«Domain Model»
CDM

Institution

Instrument

...
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Domain Model
«Domain Model»
CDM

Institution

Instrument

...
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Message Model
«Message Model»
Market Data

Prices

...
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Service Model
«Service Model»
Pricing Service

Instrument 1
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What do we do with the models?

THE SOA TOOLKIT

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The SOA Toolkit

Information
Architect

Domain Enterprise
Model Modellers

• Analyse & Validate Model

• Manage common data
Messaging types
Team • Publish Web Site
Message (Continuous)
Model Service
Model

• Create derived models • Model Services

• Analyse and synchronise Business • Generate Web Services
changes between domain Analyst • Apply standards and best-
and message model practice
• Generate XML Schemas • Abstract the platform
Developers • Develop Java Code
• Deploy Services
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Getting there

THE STORY
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The Story - Overview

Prototype:
POC: Service Project Issues with
UML to XSD Generator Release 1.0 Release 2.0 Sonic ESB

Project goes live Release 2.1

with generated Sonic ESB
Web Service Introduced
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The proof-of-concept

FROM UML TO XSD

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POC: The Stack

• UML API
• UML Meta-model
• UML to Ecore Conversion
UML to XSD POC

UML2 Eclipse Modeling Framework

• Meta-Modelling Language
EMF • Code Generation
• XML Persistence
Eclipse • XML Schema Generation

• Plug-in Architecture
• UI Framework
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POC: UML to XML Schema

Custom Custom
UML2Ecore Ecore Schema
Converter Builder

Eclipse UML Ecore XML

Model Models Schemas
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POC: UML to XML Schema

• Suppress Ecore annotations

• Customise Data Mapping
• Standardise Namespace
• Experiment with XML Choice
• Reference XML Data Types
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CHOOSING A UML MODELLING TOOL

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The Contenders

Rational
MagicDraw Enterprise Architect
Software Modeler
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Why RSM?
• Eclipse Based
– Extensible
• Plugin Development Environment
– Integrated
• Java Development
• XML Editing
• Version Control
– Developer Friendly
• UML API
• Open-Source Foundations
– EMF
– UML2
– GMF
– TPTP
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More Eclipse Frameworks

WEB SERVICE GENERATION

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Web Service Generation Stack

• Web Projects & Facets

Service Project Generator • WSDL
• Deployment Descriptors
Web Tools • ...
UML2
Platform
• Templates (JET)
EMF • Source Code Merging

JDT
• Classpath Handling
• Java Compiling
Eclipse
• UI Framework
• UML Profiles • Resources Framework
• Builders
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The Generation-Chain Model

USING MDD TO DEVELOP MDD TOOLS

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The Generation Chain

Generate
Expand/Apply Generate Generate Web Platform Retrieve
UML to Ecore Ecore to XSD
Patterns Java Bindings Project Specific Dependencies
Artefacts
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Generation Chain Meta-Model

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Generating an API

Java API
with
XMI Persistance

EMF
UML
Code
Importer
Generator
Eclipse Model
Generation Ecore Model Editor
Chain Model & EMF GenModel
(UML)
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Creating and Synchronizing

MESSAGE MODELS
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Creating a Derived Model

Domain • Palette is constrained by

Model
domain
Constraint • Relationships limited to
those available in Domain
Message
Model Model
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Creating a Derived Model

• Message Palette
• Domain Element Selection Dialog
Message Modeling • Edit Helpers

Rational Software Modeler

Graphical Modeling Framework
• Integrated Platform for modelling
UML2 GMF tools
• Unites GEF and EMF
• Notational Meta-Model
EMF GEF • Model-View Separation

Eclipse
Graphical Editing Framework
• Drawing Canvas
• Palettes & Tools
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Synchronisation Problem

Domain
Model

Constraint

Message
Model
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Synchronisation Problem

Domain • Model elements renamed

Model
• Model elements deleted
Constraint • Types change
Message
• Packages are restructured
Model
• Traces break
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Synchronising Models

• Detect and automatically fix

broken traces
Rational BGI • Report items requiring human
Software Model decision making
Modeler Analysis

TPTP
Test & Performance Tools Platform
• Static Analysis
Eclipse • Reporting
• Quick Fix Support
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Keeping the models pure

THE ‘IDENTIFIABLE’ PROBLEM

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The ‘Identifiable’ Problem

<schema xmlns= "http://www.w3.org/2001/XMLSchema"

targetNamespace= "http://gxml.bglobal.com/Identifiable”>
<complexType name= "Identifier">
<attribute name="type" type="string"/>
<attribute name="value" type="string"/>
</complexType>
</schema>

<Instrument>
...
<Identifier type="SEDOL" value="0263494"/>
<Identifier type="CUSIP" value="037833100"/>
...
</Instrument>
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The ‘Identifiable’ Problem

Just model it?

Pollutes business model with

technical concerns
Identifiable is not a business
concept (in this case)
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The ‘Identifiable’ Problem

Does not change structure of
business model
Downstream Implementation
can change

<schema xmlns= "http://www.w3.org/2001/XMLSchema"

targetNamespace= "http://gxml.bglobal.com/Identifiable”>
<complexType name= "Identifier">
<attribute name="type" type="string"/>
<attribute name="value" type="string"/>
</complexType>
</schema>

«apply»
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Summary and tips

WRAPPING UP
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Benefits of Model-Driven

• Models improve communication

• Agile Architecture
• Platform Independence
• Time-to-market
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Benefits of Eclipse Technology

• Eclipse enables a seamlessly integrated solution
• Modeling Projects provide all the scaffolding for
Model-Driven Development
• Reduces the gap between the generators and
platforms
• UI, Projects, Resources – all taken care of
• Developers are comfortable with Eclipse Plugins
• Keeps getting better
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Thinking of giving this a go?

TOP 10 TIPS
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Tip #1
Take an iterative and incremental approach
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Tip #2
Get buy-in from key stakeholders and groups
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Tip #3
Use what is already out there...

...but be wary of in-the-box

solutions
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Tip #4
Don’t pollute your business models
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Tip #5
Have at least one MDD veteran
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Tip #6
Version your models along with everything else
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Tip #7
Manage your inter-model dependencies and monitor
them for leakages
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Tip #8
Automate where possible
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Tip #9
Work with project teams and reduce their risk...
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Tip #10
and if there is failure..

Share It
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Questions?

Thank You
tas@model-driven.co.uk