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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 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 ### a. Pattern description
The observer pattern is a software design pattern in which an object, called the subject, 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, maintains a list of its dependents, called observers, and notifies them automatically of any state changes,
usually by calling one of their methods. 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 ### b. When to use Observer pattern
### c. Actors ### c. Actors