Design Patterns - Strategy Pattern
17 Jul 2018
Define a family of algorithms, encapsulate each one, and make them interchangeable. Strategy lets the algorithm vary independently from the clients that use it.
| Intent | Enables you to use different business rules or algorithms depending on the context in which they occur |
| Problem | The selection of an algorithm that needs to be applied depends on the client making the request or the data being acted on. |
| Solution | Separate the selection of algorithm from the implementation of the algorithm. Allows for the selection to be made based upon context. |
| Participants and Collaborators | Strategy declares an interface common to all supported algorithms, and specifies how the different algorithms are used. Concrete Strategy implements these different algorithms using Strategy interface. Context uses a specific Concrete Strategy with a reference of the type Strategy |
| Consequences | The Strategy pattern defines a family of algorithms. Switch or Conditional can be eliminated |
Example
