The application
The application keeps track of truck information, transportation route information, and current weather information. The truck and route information may be stored in the company's own database, while the weather information may be an external service that the company has access to (such as a proprietary weather forecasting business, or weather information available on the web from the government weather services).
A transportation manager for the company is concerned with a particular transportation route that is much quicker than alternatives, but becomes dangerous in severe weather. The manager installs a continual query (CQ) over the truck and route database that gets triggered whenever the weather along the route in question becomes severe.
The application notifies the manager whenever the weather is severe, and suggests other routes for the company's trucks to take.
The Continual Query
Monitor the weather on the Oregon coast between New Port and Astoria over the next 3 months, and provide a list of alternate transport routes when the weather is bad (snow, heavy wind, or heavy rain).
The components of the system
Interactions of the system
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