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    PPT PPT Presentation Transcript

    • The Developer Perspective Michelle Osmond
    • Design – Requirements Gathering
      • Sales & Research projects
        • Prototypes/Demos
      • User group meetings
      • Usability workshops & questionnaires
        • With close collaborators: resource-intensive process
        • Focus on Java Client, not portal
      • Support calls
        • Bugs
        • Feature requests
    • Design - implementation
      • Service-oriented approach to implementation
        • J2EE, EJBs / Java RMI / Web Services
      Server Configuration Deployment Execution Task Archive Data/WF Storage Java Client Servlets Portlets Web services Command line Web Portal
      • Main focus on Java client for workflow development, execution and deployment
      Design – create workflows
      • Provide framework for users to develop and deploy their own workflows to the portal
        • Users manage their own design and evaluation of portal services
      Design – deploy workflows
      • Basic portal:
        • Userspace (file) access
        • List of services
        • Dynamically generated page for each service
      Design – web portal (servlets)
      • Jetspeed (portlet-based) portal:
        • Users additionally have control over the whole portal site layout
        • Can integrate own custom tools as portlets
      Design – web portal (portlets)
    • Technical Strategy
      • Technologies
        • J2EE (JBoss) server, includes portal on embedded Tomcat (servlets, JSPs, Struts).
        • Portlets: JSR-168, on Jetspeed 1.6
      • Portal Functionality: subset of Java Client, for simpler use
        • Userspace access (files and workflows)
        • Execution of deployed workflows (services)
        • Task management
        • Also:
        • Server administration
    • Development Issues
      • Time / Resources
        • Portal & its usability not a top priority
        • Engine and Java Client have the focus
        • Many developer skills needed:
          • Java RMI, Swing GUIs, Tomcat/J2EE, XML, HTML, CGI, JavaScript, JSP, Servlets, Struts & Tiles, JSR-168, Applets, AJAX…
          • Web design, accessibility, usability, compatibility
    • Development Issues
      • Browser differences
        • Discourages development of rich interfaces using JavaScript
        • Plugin support, e.g. SVG
      • Technology limitations
        • Struts & portlets
      • Portal QA
        • Difficult to do comprehensively
      • Maintainability/testing of rich JavaScript interfaces
    • Evaluation
      • Java client has the focus
        • Usability workshops, questionnaires
      • Portal not formally evaluated
        • Bug reports, feature requests
        • Users design and evaluate their own portal services
    • Lessons Learnt - Good
      • Deployed services are useful and popular
        • Easy to parameterise and execute
        • Easy to update and add functionality
          • Users have complete control over portal services: design, construct workflow, deploy to web
          • Flexible and powerful workflow system
      • Portlets allow portals to be easily customised further
        • Skinning, layout
        • New, custom or third-party tools
      • Continually developing new features, driven by user requests
    • Lessons Learnt – Not so good
      • No formal UI design stage or manager
        • Inconsistent look & feel
        • UI convenient/intuitive for the developer, not the user
        • Deployment tool UI in particular (working on this)
      • Awareness of UI problems: existence, importance
        • “ INVALID” bugs, “it’s documented in the manual”
      • Interactivity, rich interfaces
        • More web renderers for parameter entry
        • Result visualisation
        • Service linking
    • Future Plans
      • Better deployment tool GUI
      • More custom, interactive web visualisers for data
      • Service linking & interactivity
        • More web renderers, e.g. applets & JavaScript, for complex input
        • Smoother use of multiple services
      • Update technology:
        • newer versions of JBoss, Tomcat
        • Look at newer portals: Jetspeed 2, JBoss Portal
    • end