model driven code development using emf and jet

© 2012 IBM Corporation

Michail Matjuchin

IBM Software Group, Rational

Austria

Model-Driven Code Development using EMF and JET

IBM Software Group /



Michail Matjuchin © 2012 IBM Corporation

A little bit about JET History

3




Agenda

Short JET Overview

JET Demo

How IBM extends EMF with UML Front-End

Standard Transformation in Rational Software Architect (RSA)

How to use JET in order to extend standard RSA behavior




What you will see in the Demo

5

Simplest Way to use JET from Java Code

Develop and Run JET Transformation (using Authoring Tool in RSA)

Create UML Model as Front-End for EMF Model

Create UML-to-EMF Transformation




JET Installation on Eclipse

6




How Does JET work ?

7

Originally built from the source code of Tomcat’s JSP compiler

JET works similar to JSP – Templates are to JET what JSP’s are to J2EE

– Generators are to JET what JSP-generated Servlets are to J2EE

– Generated source code is to JET what HTML output is to J2EE




Simplest Way to use JET

8





9





10




What are JET, JET2, EMFT JET, …

11

JET 1 = Java Emitter Templates. – Started out as separate component of the Eclipse Modeling Project

(EMF) - 2004

JET 2 – An initiative to unify Design Pattern Toolkit (DPTK) and the JET

component of EMF

– Lives in EMF Technology (EMFT) project, hence the name EMFT JET

– JET 2 = EMFT JET





12





13

Out-of-the-Box Loaders:

EMF based: org.eclipse.jet.emf

XML: org.eclipse.jet.emfxml





14




You need a little bit more in “real life”

15




JET Authoring Theory

16

Normal

development Pattern Recognized

Build a Reference Solution Build a JET Transformation




JET Transformation using Authoring Tool in RSA

17




Model-to-Text Transformation / Steps

18

„Backward“ move from the

Reference Solution to a JET

Transformation that can

produce it

Reference

Solution

Actions and

Templates

Generated

Solution Input Model




Important Caveats

19

JET does not help you recognize a pattern. Possible clues you have: – “I keep doing the same thing over and over again.”

– You find yourself copying code.

JET does not help you build a reference solution. This is the job of

the ADC tooling. A good reference solution: – Reflects domain knowledge.

– Employs best practices.

– Identifies and (as much as possible) separates areas where the solution

is incomplete (and would require user customization).

– Works




Steps to a complete solution

20

Reference

Solution

JET Transformation Input

Model

User

Model Front-end

1. Jet Authoring

2. Model-to-model authoring




Model-to-Text Transformation / Steps

21

Create a Reference Solution (Exemplar)

Identify Patterns in your Reference Implementation

Use JET Tooling to produce „Code Generator“ – Create EMF Model of your Reference Solution

– Create JET Templates

If graphic front-end is needed

Identify the graphical model (UML + Profiles) or UML-based DSL

Build a Model-to-Model Transformation using Mapping Editor

Invoke JET Transformation




“Out-of-the-Box” JET Functionality

22




JET & UML

23




What about Code-Merge

24




What about Code-Merge

25




Transformations in MDD

27

Source Model (UML)

Target Source Code

Transformations

JET & UML API

Intermediate

ECORE Model

Model-to-Model

Transformations

Mapping Editor

JET

Transformations




Standard Transformations provided by RSA

28

UML-to-EJB 3

UML-to-JPA (Java Persistence API)

UML-to-WSDL (Web Services)

UML-to-SCA (Service Component Arcitecture)

UML-to-SOA (WSDL, XSD, BPEL)

UML-to-XSD (XML Schema Definition)

UML-to-REST (JSON)

C#, C++ und VB




RSA provides “Transformation Authoring Framework” to change/modify existing Transformations

29

Model-to-Text Transformations

Model-to-Model Transformations

Transformations – Extensions

model driven code development using emf and jet

Documents