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Petrutiu Mihai
2016-07-14 10:15:51 +03:00
committed by Petrutiu Mihai
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@@ -260,11 +260,20 @@ The memento pattern is a software design pattern that provides the ability to re
6. Observer pattern
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[ObserverClassDiagram]: https://github.com/MihaiTheCoder/BehavioralPatterns/blob/master/BehavioralPatternsDiagrams/Observer/ObserverClassDiagram.PNG "Observer class diagram"
[ObserverSequenceDiagram]: https://github.com/MihaiTheCoder/BehavioralPatterns/blob/master/BehavioralPatternsDiagrams/Observer/ObserverSequenceDiagram.PNG "Observer sequence diagram"
### a. Pattern description
The observer pattern is a software design pattern in which an object, called the subject,
maintains a list of its dependents, called observers, and notifies them automatically of any state changes,
usually by calling one of their methods.
Class diagram for the observer pattern:
![alt text][ObserverClassDiagram]
Sequence diagram for the observer pattern:
![alt text][ObserverSequenceDiagram]
### b. When to use Observer pattern
### c. Actors