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Petrutiu Mihai
2016-07-20 14:58:22 +03:00
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@@ -415,6 +415,15 @@ If we want to implement this using state pattern, we would need to make a new cl
### a. Pattern description ### a. Pattern description
Strategy pattern (also known as the policy pattern) is a software design pattern that enables an algorithm's behavior to be selected at runtime. Strategy pattern (also known as the policy pattern) is a software design pattern that enables an algorithm's behavior to be selected at runtime.
The strategy pattern defines a family of algorithms, encapsulates each algorithm, and makes the algorithms interchangeable within that family. The strategy pattern defines a family of algorithms, encapsulates each algorithm, and makes the algorithms interchangeable within that family.
[StrategyClassDiagram]: https://github.com/MihaiTheCoder/BehavioralPatterns/blob/master/BehavioralPatternsDiagrams/Strategy/StrategyPatternClassDiagram.png "Strategy class diagram"
[StrategySequenceDiagram]: https://github.com/MihaiTheCoder/BehavioralPatterns/blob/master/BehavioralPatternsDiagrams/Strategy/StrategyPatternSequenceDiagram.png "Strategy sequence diagram"
Class diagram for the strategy pattern:
![alt text][StrategyClassDiagram]
Sequence diagram for the strategy pattern:
![alt text][StrategySequenceDiagram]
### b. When to use Strategy pattern ### b. When to use Strategy pattern
* Classical thing to say: Whenever you start to use a switch statement you should ask yourself whether you can use Strategy Pattern instead. * Classical thing to say: Whenever you start to use a switch statement you should ask yourself whether you can use Strategy Pattern instead.
* When you want to externalize part of the algorithm * When you want to externalize part of the algorithm