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Yu, et al.’s “A Model-Driven Development Framework for Enterprise Web Services” In proceedings of the 10 th IEEE Intl Enterprise Distributed Object Computing Conference (EDOC06). A summary. Agenda. Context: 5 mins intro to MDD Summary of the main points in the paper: The idea

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A summary

Yu, et al.’s“A Model-Driven Development Framework for Enterprise Web Services”In proceedings of the 10th IEEE Intl Enterprise Distributed Object Computing Conference (EDOC06)

A summary


Agenda
Agenda

  • Context: 5 mins intro to MDD

  • Summary of the main points in the paper:

    • The idea

    • The main contribution

    • Section by section summary

  • Discussion

    • Some possibilities for improvement

    • The final grades!


Mdd the basic idea
MDD – the basic idea

  • Raising the level of abstraction

  • Main benefits:

    • “Closer” to the real concepts  Software specification and understanding are easier

    • Less bound to the underlying platform  Software maintenance is easier (“Model once, Generate everywhere”)


Mdd the lingo
MDD – The Lingo

  • Models

    • M1: Describe/Specify the real things

  • Modeling languages

    • Notation, Syntax, Semantics

  • Meta models and meta languages

    • M2: Describe the modeling language

      • An XSD file is an M2, XML schema is the meta language


Mdd the lingo 2
MDD – The Lingo (2)

  • Model Transformation:

    • Same idea as compiling

      • just more difficult, due too the wider gap of abstraction

    • Is done at the meta level

      • Elements and relationships mappings

    • Involves:

      • A set of mappings (Transformation Rules), expressed in a certain transformation language

      • A transformation engine (like a compiler)


The paper idea
The paper - Idea

  • Start with EDOC models

    • Enterprise Distributed Object Component, a UML-based language designed for distributed, component-based systems

  • Automatically generate the WDSL files (Not the web services themselves) for all the Web Services involved in the models


The paper contributions
The paper – Contributions

  • A set of EDOCWDSL transformation rules

    • Could be used for what it is designed for (of course)

    • Serve as a a concrete example of MDD

      • Meta models for both EDOC and WDSL were given in UML notations

      • How entities and relationships from one meta model are mapped to another


The proposed transformation rules
The proposed transformation rules

  • Described in details in section 4 of paper

  • Transformation language used: An extended version of OCL

    • OCL = Object Constraint Language

    • Designed for specifying syntax of languages

    • Authors wanted to stay transformation language neutral

  • Maps data types and elements from CCA (Component Collaboration Architecture) to data types and elements in WSDL meta model (an XML Schema)


Other sections
Other sections

  • Section 1, 2 & 3:

    • Briefly introduces MDD, MDA, UML, EDOC, SOA, WS

  • Section 5:

    • An illustrative example on how the proposed transformation rules can be used

    • An E-library system, modeled in EDOC, to be implemented using WS, whose WDSL files are auto-generated by the proposed rules

  • Section 6 & 7:

    • Related works and Conclusions


Improvement possibilities
Improvement Possibilities

  • Specificity

    • Author didn’t mention what transformation engine used, and its complexity

    • How UML models (graphical notation) are first converted to textual notations before the transformation rules can be applied?


Improvement possibilities1
Improvement Possibilities

  • Generality

    • OCL works (according to the paper) for this particular mapping, but was not designed as a transformation language.

    • UML and its derivatives have been questioned as machine-processable modeling language: Originally intended for human reading  No formal semantics


Improvement possibilities2
Improvement Possibilities

  • Only generate the WDSL files

    • Actual implementation, if to be auto-generated, requires a different transformation

    • More results would be needed to make a complete solution

      • The author mentioned that they have some work in progress

      • Can it be combined with other reported approaches? (Commercial tools already do this for other modeling language)


Numerical grades
Numerical Grades?

  • Originality 4/5

  • Technical merit 3/5

  • Presentation 4/5

  • Overall 4/5


Conclusions
Conclusions

  • The paper provides a concrete example of MDD and model transformation

    • Graphical meta models for EDOC and WSDL were given in the paper

  • A set of mappings between EDOC and WSDL was provided

    • No vigorous testing provided, but very sensical

  • More result will make the solution more complete and useful

    • How the actual implementations can be generated (using either the author’s or other’s approaches)


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