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What do you mean by event ? What are the types of event explain with example ?

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By By Team EasyExamNotes

Event Definition:

  • An event is something that happens at a specific point in time. It’s like a message or notification from one thing to another.
  • Events are quick, occurring instantly in the application’s timescale.

Types of Events:

A. Signal Event:

  • What is it? It’s like sending or receiving a message (signal) between objects.
  • Example: Think of a “TrainDeparture” signal with details like train, train number, city, and date.

B. Time Event:

  • What is it? It happens at a specific time or after a certain time interval.
  • Example: “when (date = January 1, 2020)” or “after (30 seconds)”.

C. Change Event:

  • What is it? Triggered when a certain condition changes from false to true.
  • Example: Events like “when (cabin temperature < heating set point)” or “when (temperature > cooling set point)”.
  • Signal: Sending messages between objects.
  • Time: Happens at a specific time or after an interval.
  • Change: Triggered when a condition changes.
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