OTExample Observer

This is a reusable implementation of the omnipresent design pattern "Observer".

Note, that a well designed program in Object Teams will usually not require an explicit Observer infrastructure. See the Stopwatch example for an example, how a plain callin-binding (4) suffices.

This demo should, however, give a quick understanding to some techniques of Object Teams for all who are familiar with the Observer pattern (the OTDT ships with a simpler version of this pattern).

protocol/ ObserverPattern	This implements the GoF pattern very straight forwardly. Open spots are: method Subject.changeOp which should be triggered at relevant base-level events and the abstract method Observer.update() which should realize the Observer's reaction.
flower_example/ Bee Hummingbird Flower	Implement some base entities
flower_example/ ObservingOpen ObservingClose	Two applications of the Observer pattern binding the above open spots using callin (4) and callout (3) bindings.
flower_example/ Main	A simple main program