Design Patterns in .NET: Reusable Approaches in C# and F# for Object-Oriented Software Design

© Dmitri Nesteruk 2019

Dmitri NesterukDesign Patterns in .NEThttps://doi.org/10.1007/978-1-4842-4366-4_22

22. State

Dmitri Nesteruk¹ 

(1)

St. Petersburg, c.St-Peterburg, Russia

 

I must confess, my behavior is governed by my state. If I didn’t get enough sleep, I am going to be a bit tired. If I had a drink, I wouldn’t get behind the wheel. All of these are states and they govern my behavior: how I feel, what I can and cannot do.

I can, of course, transition from one state to another. I can go get a coffee, and this will take me from sleepy to alert (I hope). In this case, we can think of coffee as a trigger that causes a transition of yours truly from sleepy to alert. Let me clumsily illustrate it for you:¹

        coffee

sleepy --------> alert

The State ...