Shulou(Shulou.com)06/01 Report--

This article mainly introduces the example analysis of deferred events in EA's UML state diagram, which is very detailed and has a certain reference value. Interested friends must read it!

Postpone the incident.

Let's first go back to the example of the traffic signal system, whether programming or design, all pay attention to a symmetry, the traffic signal system has a start process, there should also be a stop process. The demand is roughly as follows:

The operator shuts down the system by operating the stop button

If the system is ready (red light on both sides), turn it off directly.

If a certain direction is in the traffic state (green light), it is switched to a safe stop state (yellow light), and after the safe stop time has passed, the system shuts down.

If you are in a safe stop state (yellow light), the system shuts down after the safety stop time (no need to restart the timing) has passed.

In either case, the system must be at a red light in both directions before a power outage.

With the addition of the stop process, the state diagram of the traffic signal system looks like this:

The above is all the contents of the article "sample Analysis of deferred events in EA drawing UML State Diagram". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.