Software Design Patterns Questions Medium
The purpose of the Command design pattern is to encapsulate a request as an object, thereby allowing clients to parameterize clients with different requests, queue or log requests, and support undoable operations.
The Command pattern is implemented by defining separate classes for each command, where each class encapsulates a specific request. These command classes typically implement a common interface or base class, which defines a method to execute the command. The client then creates an instance of the desired command class and passes it to an invoker object. The invoker object is responsible for executing the command by calling the execute method on the command object.
The command object itself holds all the necessary information and context required to perform the requested action. This allows the command to be executed independently of the client or the receiver of the command. Additionally, the command pattern supports the concept of undoing or redoing commands by providing methods such as undo or redo in the command interface or base class.
Overall, the Command design pattern provides a way to decouple the sender of a request from the receiver, allowing for greater flexibility and extensibility in the system design.