A generic pull-style UML class diagram is shown below. ConcreteSubject inherits subscription management from Subject; ConcreteObserver realizes the Observer interface. The subject can have many registered observers, while a concrete observer uses its subject reference to obtain state during update.
Figure 1.
Observer-pattern roles, subscriptions and pull-style state access
. Open triangles indicate inheritance or interface realization. Ordinary directed associations indicate references and do not assert ownership of observer lifetimes. Subject notification invokes the Observer update interface. Details.

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