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Active Web Technology

Active Web Technology. Alan Dix http://www.hiraeth.com/alan/topics/web/ alan@hcibook.com. user view. what changes? media stream, presentation, content by whom? automatic, site author, user other users - feedthrough how often? pace of change: days, months, seconds. computation.

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Active Web Technology

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  1. Active Web Technology Alan Dix http://www.hiraeth.com/alan/topics/web/ alan@hcibook.com

  2. user view • what changes? • media stream, presentation, content • by whom? • automatic, site author, user • other users - feedthrough • how often? • pace of change: days, months, seconds

  3. computation where does it happen client • applets, JavaScript, Shockwave, DHTML server • CGI scripts, active server pages, servlets, etc, other machine • authoring machine, database server, proxy people • socio-techncal solutions

  4. security • for computation • code and data at same place! • problem • data - needs to be secure • web-server - least secure machine • client machine even worse … and networks!

  5. architectural design • what happens where • affects: • complexity of implementation and maintenance • feedback • seeing results of one’s own actions • feedthrough • seeing effects of other people’s actions

  6. client side dynamism animation Java and JavaScript DHTML

  7. animated gif or movie • pros: simple • cons: predetermined sequence also … streaming audio/video

  8. Java applet or JavaScript running locally • pros: rapid feedback • cons: only local, no feedthrough

  9. server side dynamism CGI scripts searches

  10. searches • create indices off-line • fast lookup when needed see http://www.hcibook.com/

  11. database access client-side - JDBC server side - CGI etc.

  12. Java applet accesses database using JDBC • pros: interactive DB access • cons: bandwidth, security

  13. CGI script accesses database • pros: up-to-date, use existing DB • cons: not proxy/index friendly

  14. socio-technical solutions off-line generation people in the process

  15. batch pre-generation of web pages • pros: indexable, secure • cons: slower turnaround

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