Chain of Responsibility Pattern and Decorator Pattern have very similar class structures. Both patterns rely on recursive composition to pass the execution through a series of objects. However, there are several crucial differences.
- The CoR handlers can execute arbitrary operations independently of each other. They can also stop passing the request further at any point. On the other hand, various Decorators can extend the object’s behavior while keeping it consistent with the base interface. In addition, decorators aren’t allowed to break the flow of the request.