2. Wrapping a Weather Module into a CHAIMS MegaModule Mike Laskin Tools and Process for Software Stanford University - CS 446 - Fall 1998 December 2, 1998

3. Wrap a weather service so it can be used as a CHAIMS- compliant megamodule - Simple, Right? Which weather service?Which weather service? Interface: CHAIMS Weather ServiceInterface: CHAIMS Weather Service Wrapping a MegaModuleWrapping a MegaModule TestingTesting

4. Typical Scenario A general has to ship troops and/or various material from San Diego NOSC to Washington DC: –different kind of material: criteria for preferred transport differ –not every airport equally suited –congestion, prices –actual weather –certain due or ready dates

5. Typical Scenario (cont.) Today:Today: –calling different companies –looking up information on the web –reservations by hand TomorrowTomorrow –system proposes possibilities that take into account various conditions

6. Weather Data over TCP/IP http://www.wunderground.com/http://www.wunderground.com/ http://cirrus.sprl.umich.edu/wxnet/http://cirrus.sprl.umich.edu/wxnet/ Colorado Weather Underground Contel DUAT System Cornell University Weather & Climate Data NCDC Hurricane System NOAA Master Directory Southern Regional Climate Center...Colorado Weather Underground Contel DUAT System Cornell University Weather & Climate Data NCDC Hurricane System NOAA Master Directory Southern Regional Climate Center...

8. Weather Data Types GeoLocation: City / Airport abbreviation / State / lattitude & longitudeGeoLocation: City / Airport abbreviation / State / lattitude & longitude ConditionsConditions –Min/Max/Avg Temperature in °F and °C –Cloud Cover level –Wind speed, direction

9. Weather Data API WeatherToday(GeoLocation)WeatherToday(GeoLocation) 5DayWeather (GeoLocation)5DayWeather (GeoLocation) ClosestWeather(Conditions)ClosestWeather(Conditions) Weather(City, Day)Weather(City, Day) 5DayWeatherFrom(City, Day)5DayWeatherFrom(City, Day)

10. Architecture: Overview Distribution System (CORBA, RMI…) CHAIMS Repository adds information to e d a b c MEGA modules wraps non-CHAIMS compliant megamodules` Wrapper Templates writes Megaprogrammer CSRT (compiled megaprogram) Megaprogram (in CHAIMS language) CHAIMS Compiler generates information Megamodule Provider

11. Megaprogram Example: Code weather_mmh = SETUP (”Weather") route_mmh = SETUP ("RouteInfo")... dayweather_ih = weather_mmh.INVOKE (”WeatherToday”, city = “Palo Alto, CA”) WHILE (dayweather_ih.EXAMINE() != DONE) {} outweather = dayweather_ih.EXTRACT()...weather_mmh.TERMINATE() // Setup connections to megamodules. // Get information from // megaprogram user // about the city. // Get the weather for the // next day // Terminate all // invocations

12. In Closing CHAIMS is a viable architectureCHAIMS is a viable architecture The weather service can be implementedThe weather service can be implemented In the future: Will finish the weather service implementationWill finish the weather service implementation Updated documentation for CHAIMS would be of great helpUpdated documentation for CHAIMS would be of great help

13. Questions???