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Weather Station State Machine

publish date: 2026/06/12 07:12:26.387767 UTC

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The weather station state diagram shows how the system responds to requests for various services. Which state does the system enter when a reportWeather() message is received while the system is in the Running state?

Operation Shutdown Configuring Running Controlled Testing Transmitting Collecting Summarizing shutdown() restart() reconfigure() powerSave() configuration ​done remoteControl() reportStatus() test complete weather summary complete transmission done clock collection done reportWeather()

Correct Answer

Summarizing

Explanation

When a reportWeather() message is received while the system is in the Running state, the system moves to the Summarizing state. When the summary is complete, it moves to a Transmitting state where the information is transmitted to the remote system, and then returns to the Running state. If a clock signal is received in Running state, the system moves to the Collecting state to collect data from instruments.

Reference

Software Engineering, Ian Sommerville, 10th edition

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