1. Command Pattern

2. Command Pattern Intent Also known as “Action” or “Transaction”
Encapsulate a request as an object, thereby letting you parameterize clients with different requests, queue or log requests,and support undoable operations.
Also known as “Action” or “Transaction”
Motivating example
GUI button or menuitem, when clicked, do some action. The button or menuitem (the invoker) do not have to know what actions are being carried out and by whom (the receiver)

3. (Imperfect) Diner Analogy
Customer (client); Order (command); Waitress (invoker); Cook (receiver);

4. Home Automation Remote Example

5. Ventor Supplied Classes

6. Command Object

7. Command Pattern Defined

8. Command Pattern Class Diagram

9. Implement Remote Control

10. Support Undo

11. Undo with State

12. MacroCommand

13. Use Case: Queuing Requests

14. Use Case: Logging Requests