These are some of the benefits of the Command pattern:
- Decoupling: The pattern permits the decoupling of the object that invokes the operation from the one that knows how to execute it. This layer of separation allows the addition of an intermediary that will be able to bookkeep and sequence operations.
- Sequencing: The Command pattern facilitates the process of queuing user inputs, which permits the implementation of undo/redo features, macros, and command queues.
This is a potential drawback of the Command pattern:
- Complexity: It takes numerous classes to implement this pattern as each command is a class in itself. And it takes a good understanding of the pattern to maintain code built with it. In most cases, this is not an issue, but if you are using the Command pattern without a specific goal in mind, it can become an unnecessary layer of complexity and verbosity in your code base.
Benefits and drawbacks are usually contextual...
