This chapter covers the Command pattern.
GoF Definition
Encapsulate a request as an object, thereby letting you parameterize clients with different requests, queue or log requests, and support undoable operations.
Concept
With this pattern, you encapsulate a method invocation process. In general, four terms are important here: invoker, client, command, and receiver. A command object can invoke a method of the receiver in a way that is specific to that receiver’s class. The receiver then starts processing the job. A command object is separately passed to the invoker object to ...
