Design and Development of a Space Weather Web Service Vern Raben Raben Systems Inc.

Overview of presentation Background What is a web service? Web service architecture XML, SOAP and WSDL Space weather service implementation Lessons learned Conclusion

Background Objective Initial implementation Transitions

What is a web service? Web application that is Self-contained Self-describing Modular Can be published, located, and invoked across the web

Web service architecture Basic View Client Application Web Service SOAP/HTTP Request SOAP/HTTP Response

Enabling Technologies XML Permits movement of structured data Separates content and presentation SOAP Use XML messages to invoke remote methods

SOAP What is SOAP Provides mechanism for exchanging structured and typed information Parts of a SOAP Message Envelope Encoding rules Conventions for procedure calls

Example SOAP Message Request Planetary Kp data from service

Example SOAP Message Response for Planetary Kp data from service

WSDL What is WSDL XML based language describing web services Tools available to generate WSDL from software code And vice-versa

WSDL Example Types

WSDL Example (Cont'd) Messages and Ports

WSDL Example (Cont'd) Binding

WSDL Status Tools available from Microsoft, IBM, Sun Microsystems Interoperability is a problem Probably year or so away

Space weather services Time series data service Ap, Flares, Kp, Neutrons, Protons,Radio, Active Regions, and X-ray Image service Synoptic images from Kitt Peak and SOHO

Space Weather Service Architecture Overview Tomcat Web server Mysql Database Apache SOAP Servlet Data Ingest Servlet Client Apps Product Generation Servlets SEC SOHO

Client applications Solar map application Real time monitor application Graph application Wireless application Interactive voice application

Solar map application

Graph application

Wireless device application Available in October Challenges Memory scarce Processor slow Network is slow No floating point Tiny screen

Wireless device application Advantages Remote data access View data graphically Interactive

Interactive voice application. IVR Gateway Web service HTTP Get VoiceXML Data Voice

Interactive voice application Advantages Easy to use (accessible) Remote data access Interactive Disadvantages Voice menu limitations Security

Accessibility Current applications meet 1 st level Java Accessibility Next release will meet 2 nd level Don't provide SRAG web content

All static content 508 compliant Dynamic content by Nov

Lessons Learned Early technology adoption has its challenges XML datasets very important Importance software design

Conclusion What a web service is SOAP and WSDL Examples from Space Weather Service

Questions?