Mastering Python Design Patterns - Second Edition

The Chain of Responsibility Pattern

When developing an application, most of the time we know which method should satisfy a particular request in advance. However, this is not always the case. For example, think of any broadcast computer network, such as the original Ethernet implementation (j.mp/wikishared). In broadcast computer networks, all requests are sent to all nodes (broadcast domains are excluded for simplicity), but only the nodes that are interested in a sent request process it.

All computers that participate in a broadcast network are connected to each other using a common medium such as the cable that connects all nodes. If a node is not interested or does not know how to handle a request, it can perform the following actions: ...