B.8 Observer pattern tags

B.8 Observer pattern tags

Figure B.8 shows the static structure of the Observer pattern (Gamma et al. 1995) annotated with UML-F tags. Table B.8 summarizes the Observer pattern UML-F tags. Observer is based on the Separation construction principle.

Figure B.8. Structure of the Observer pattern annotated with UML-F tags.

Table B.8. Definition of the UML-F Observer pattern tags.

Tags	Observer Subject , Observer Observer , Observer ConcreteObserver , Observer notify , Observer update , Observer update , Observer observers
Apply to	As shown in Fig. B.8: Class ( Observer Subject , Observer Observer , Observer ConcreteObserver ) Method ( Observer notify , Observer update , Observer update ) Interface ( Observer Subject , Observer Observer ) Association ( Observer observer )
Type	String.
Expansion	The Observer pattern is based on the Separation principle and therefore its tags expand as follows: Observer Subject to Sep T , Observer notify to Sep t , Observer Observer to Sep H , and Observer update to Sep h .