exercises-in-programming-style/12-hollywood

Style #13

Constraints:

• Larger problem is decomposed into entities using some form of abstraction (objects, modules or similar)

• The entities are never called on directly for actions

• The entities provide interfaces for other entities to be able to register callbacks

• At certain points of the computation, the entities call on the other entities that have registered for callbacks

Possible names:

• Hollywood agent: "don't call us, we'll call you"
• Inversion of control
• Callback heaven/hell