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WebML and WebRatio 5 - TOOLS conference, Zurich 2008

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We present WebRatio 5.0, a design tool that supports WebML (Web Modelling Language). WebML is a domain specific language (DSL) for designing complex, distributed, multi-actor, and adaptive ...

We present WebRatio 5.0, a design tool that supports WebML (Web Modelling Language). WebML is a domain specific language (DSL) for designing complex, distributed, multi-actor, and adaptive applications deployed on the Web and on Service Oriented Architectures using Web Services. WebRatio 5.0 provides visual design facilities based on the WebML notation and code generation engines for J2EE Web applications. The tool is developed as a set of Eclipse plug-ins and takes advantage of all the features of this IDE framework. It also provides support of customized extensions to the models, project documentation, and requirements specifications. The overall approach moves towards a full coverage of the specification, design, verification, and implementation of Web applications.

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    WebML and WebRatio 5 - TOOLS conference, Zurich 2008 WebML and WebRatio 5 - TOOLS conference, Zurich 2008 Presentation Transcript

    • http://home.dei.polimi.it
      marco.brambilla@polimi.itmarcobrambiMarcoBrambi
      Web applications design and development
      with WebML and WebRatio 5.0
      Roberto Acerbis1, Aldo Bongio1, Marco Brambilla2, Stefano Butti1, Stefano Ceri2, Piero Fraternali2
      1WebRatio, Italy2 Politecnico di Milano, Italy @ TOOLS Europe 2008, Zurich
    • Summary
      Introduction
      WebML
      Trends and evolutions
      WebRatio toolsuite
      The WebRatio 5 edition for Eclipse
      Industrial experiences
      Conclusions
      2
    • Intro
      Conceptual modelsfor Web applications
      Software engineering practicesapplied to the Web environment
      Methodologies
      CASE tools
      Model verification
      Code generation
      Our story:
      Starting from data-intensive Web applications
      Moving toward service-oriented architectures, distributed business process modeling, client-side computation (RIA), semantic Web services and applications
      Added value to the analyst (Function Points), the designer and the developer
      Formalization of semantics, MDA representation
      3
    • WebML (Web Modeling Language)
      DSL for designing large-scale Web applications
      Specifies CONTENT, HYPERTEXT, and PRESENTATION
      4
      Content + Hypertext + Presentation
    • WebML: Data model
      5
      ShipmentServicewhere ShipmentService.shipTonot inShipmentService.locatedIn
      Self TO Europe where Self.locatedIn isa Europe
      Content model + redundant data calculation
      ER or UML class diagrams
    • WebML: Hypertext model
      6
      • Composition modeling:pages and units
      • Navigation modeling:links
      • Execution modeling: operations, control and data (FSM formalization)
    • Going beyond: trends and challenges
      7
      Scenario:
      The Web as an implementation platform of business information systems
      Distributed intra- and inter-enterprise business processes
      Support to new user interaction patterns
      Integration of reasoning and Semantic Web features
      Needs:
      SOA support
      Business process management
      Rich Web Interfaces (RIAs)
      Solution:
      Modeling primitives for
      Business process management
      Service invocation and publishing
      AJAX-based user interaction
    • Development step
      Focus: model driven design of collaborative Web applications based on business processes, spanning multiple individuals and organizations
      Proposal: a methodology for seamless flow from specifications to design, exploiting Top Down Design, Model Driven Specifications, standard models and languages. The methodology is supported by CASE tools, engines for semi-automatic generation of intermediate models, and automatic generation of running code
      8
    • Overall picture
      9
    • Business process modeling
      10
      The Workflow Model represents the business process to be executed, in terms of activities, precedence constraints, and actors in charge of executing the activities.
    • Process Distribution
      11
      • Possibility of delegating one activity or a whole subprocess to different peers
      • Interaction between peersbased on Web services
      • Exchanged messagesnotify the workflow status changes to the peers
    • Mapping of BP to Hypertext Models
      12
      Automatic generation of:
      • SQL script
      • WebML skeleton (different styles)
      • Hypertext links behaviour
      • Project documentation (specifications and design)
    • Rich Internet Application design and code generation
      RIA features covered by the language:
      partial page refresh, in-page popup windows, splash screens, dynamic tooltips, animations;
      drag&drop and dynamic dependencies;
      text autocompletion, on-event actions, and field dependencies.
      Code generation and runtime support:
      mix of opensource technologies, extensively exploiting the XMLhttpRequest method.
      Runtime solution: two dynamic pages for each conceptual page that interact through XMLhttpRequest for providing the rich interface features:
      a back-end dynamic XML page that stores the data of interest for a specific navigation context
      the front-end JSP page (including JavaScript for event management) shown to the user
      13
    • WebRatio: The company and the product
      Some customers:
      Web Models
      Location: Como (research and product development)
      and Milano (sales and application development)
      Born in 2001 as a “spin-off”
      of Politecnico di Milano
      Continuous cross-fertilization with Politecnico
      for research and exploitation
      … and 80+ universities and research centers that use the tool for free
    • WebML Project Design
      WebRatio
      Visual Identity
      Running
      Web Application
      Data Sources
      Custom Components
      WebRatio Tool Overview
      Model Diagram Editor based on GEF
      Text Editors and component wizards for implementation of custom units
      Full workspace and CVS support for versioning and multi-user development
      Code Generators based on Ant, Groovy, and XSL
    • Model Diagram Editor
      Graph Editor
      Tabbed Properties
      Multi-editor
      Problems
    • Text Editor
      Syntax Highlighting
      Code Completion
    • Business Components Editor
      Eclipse Forms Components
      Multi-editor
    • Runtime Architecture and Code Generation
      • Smart services: created upon request, cached, and reused;
      • Activity log, XML parsing and access, Connection pooling
      • One single service class is deployed for each type of component and one runtime XML descriptor is deployed for each component
    • Code Generation for a simple unit:
      <INDEXUNIT entity="News" name="News List"> <DISPLAYATTRIBUTE attribute="name"/> <ORDERATTRIBUTE attribute="date"/></INDEXUNIT>
      <Descriptor service="com.webratio.IndexUnitService">
      <OutputParameter position="1" type="String"/> <Query>
      SELECT NAME
      FROM NEWS_TABLE
      ORDER BY DATE
      </Query></Descriptor>
      Runtime Architecture and Code Generation
      • Smart services: created upon request, cached, and reused;
      • Activity log, XML parsing and access, Connection pooling
      • One single service class is deployed for each type of component and one runtime XML descriptor is deployed for each component
    • Conclusions and ongoing activities
      Current status:
      Established DSL and tool for Web application design
      Ongoing research on:
      Rich Internet Applications: models and code generation
      Business Process-based Applications: model transformations
      Search-oriented applications: technological platforms and front end architectures
      Semantic Web and SOA
      DSL modernization through MDD/MDA mainstream tools
      21
    • Thanks
      22
      ?
      Questions
      Marco Brambilla
      http://home.dei.polimi.it
      Politecnico di Milano
      marco.brambilla@polimi.itmarcobrambiMarcoBrambi