Basic HTML version of Foils prepared Sept 30 98

Foil 17 Summary of Pragmatic Object Web

From A Coarse Grain Performance Estimator -- PetaSIM and a Hybrid Distributed Object Model for the IPG NASA Workshop on Performance Engineered Information Systems -- Sept 28-29 98. by Geoffrey C. Fox, Yuhong Wen, Wojtek Furmanski, Tom Haupt
1 3-(or more)-tier architecture - Web browser front-ends, legacy (e.g. databases, HPC modules) backends; fat middleware
2 Use as appropriate the alternative / competing Middleware models:
  • Java RMI+ EJB (Enterprise Javabean) - single language solution by Sun
  • CORBA - all languages solution by OMG
  • COM - multi-language solution by Microsoft
  • WOM/XML - emergent solution by the Web Consortium
3 Each model has different tradeoffs (most elegant, powerful, fastest, simplest)
4 POW integrates various models and services either by linking multiple brokers/servers or in terms of a single multi-protocol middleware server (JWORB)
  • Note Java is often the best language to build middleware whether this is Java or some other distributed object model
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