|Introduction to Object-oriented Programming - slide 7 : 22|
Peter orders a Pizza at AAU Pizza by email.
Via interaction between a number of service providers, a pizza is delivered to Peters group room
A client asks for a service at some given service provider (server ).
This may lead the service provider (which now plays a client role) to ask for subservices
Clients and servers communicate by passing messages that return results
Try the accompanying SVG animation