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The Command pattern is a behavioral design pattern in object-oriented programming (OOP) that encapsulates a request as an object, thereby allowing clients to parameterize clients with different requests, queue or log requests, and support undoable operations. It decouples the sender of a request from the receiver, allowing different types of requests to be handled in a uniform manner. |
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The Command pattern consists of several key components:
Command: Defines an interface for executing a specific operation. This interface typically includes a method like
execute()that triggers the execution of the command.Concrete Command: Implements the
Commandinterface and represents a specific command or action. It encapsulates the receiver and binds the receiver with the action to be performed.Receiver: Represents the object that receives the request and knows how to perform the actual operations.
Invoker: Requests the execution of a command by calling the
execute()method defined in theCommandinterface. It does not know the specifics of the command or how the command is executed.Client: Creates a command and sets its receiver, then passes the command to the invoker to execute.