A template method contains a generic algorithm skeleton, delegates part of algorithm to abstract hook methods.
- Hook methods are overwritten in sub-classes to provide the specifics steps.
- Template and hook method are implemented in the same class / object.
- Polymorphism enables variability.
Benefits:
- Easily separate core logic and variation points.
- Easily provide many different implementations of the details and use the one you need.
Disadvantages:
- Variation is only supported at compile time.