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Petrutiu Mihai
2016-07-13 20:08:58 +03:00
committed by Petrutiu Mihai
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@@ -254,10 +254,10 @@ usually by calling one of their methods.
### b. When to use Observer pattern
### c. Actors
* Subject -> Interface/Abstract Notifies interested observers when an event occurs
* Concrete Subject -> Implementation of Subject
* Observer -> Interface/Abstract class -> Registers to a subject, to be notified when a specific event happens
* Concrete Observer -> Implementation of the observer
* Subject -> Interface/Abstract Notifies interested observers when an event occurs. Allows Observer to subscribe/unsubscribe.
* Concrete Subject -> Implementation of Subject.
* Observer -> Interface/Abstract class -> Defines a method to be called when the Subject wants to notify observers
* Concrete Observer -> Implementation of the observer. Registers to a subject, to be notified when a specific event happens
### d. Pitfalls
* Lapsed Listener problem