[Special] Design Pattern - Behavioral Patterns - Command Pattern

2007

Section 2, Chapter 3

Command Pattern

Concept

Use

This is useful in the case of undoing or redoing some action, or simply storing an action in a request queue on an object.

Design

The Command pattern has three main components:

• the Invoker: acts as a link between the commands and the receiver and houses the receiver and the individual commands as they are sent;
• the Command: an object that encapsulates a request to the receiver;
• the Receiver: the component that is acted upon by each request.

Illustration