Pro Design Patterns in Swift

Chapter    19

The Chain of Responsibility Pattern

The chain of responsibility pattern is useful when there are multiple objects that could take responsibility for a request but you don’t want to expose details of those objects to the calling component. Table 19-1 puts the chain of responsibility pattern into context.

Table 19-1. Putting the Chain of Responsibility Pattern into Context

Question	Answer
What is it?	The chain of responsibility pattern organizes sequentially a set of objects that may be able to take responsibility for a request from a calling component. The sequence of objects is referred to as a chain, and each object in the chain is asked to take responsibility for the request. The request moves along the chain until one of the objects ...