The chain of responsibility pattern promotes loose coupling by separating the request senders from the request receivers and processors. It works like how a sender sends a request to be fulfilled to one of the receiver objects, and this object either fulfills the request and returns, or it partially fulfills the request, does not process the request, and sends the request to the next request receiver/processor object until it has been handled. In this way, all the request receivers, processors, or handlers are chained to each other.
A more common example of this pattern is this: say, we have a request to purchase an item and it requires an approval; it depends on the value of an item whether it can be approved ...
