The intent of the Strategy Pattern is to define a family of algorithms, encapsulate each algorithm, and make them interchangeable. … All (27) Design patterns (7) Composer (2) PHP & Angular (7) PHP tips (5) PHP & AngularJS (1) Strategy in PHP Back to Strategy description In the Strategy Pattern a context will choose the appropriate concrete extension of a class interface. ebook on design patterns. Using the strategy patter… The strategy design pattern is another commonly used design pattern. In a complex example, all those parts would be in the same class. This pattern is used to handle the software algorithms, manage interactions and responsibilities among objects to achieve a specific task. This design pattern focuses on separating the used algorithm from the client. The original class, called context, must have a field for storing a reference to one of the strategies. Strategy design pattern is identified as a behavioral design pattern since it directly controls the object behaviors. The original object, called context, holds a reference to a strategy object and delegates it executing the behavior. Clear, short and fun! Strategy. In this pattern, algorithms are extracted from complex classes so they can be replaced easily. It is used when you might have multiple ways (different implementations) to … Simple descriptions and full source code examples in Java, C++, C#, PHP and Delphi. After 3 years of work, we've finally released a new ebook on design patterns! us, 22 design patterns and 8 principles explained in depth, 406 well-structured, easy to read, jargon-free pages, 228 clear and helpful illustrations and diagrams, An archive with code examples in 4 languages, All devices supported: EPUB/MOBI/PDF formats. For example, we have multiple algorithms for sorting arrays, but based on the number of elements of the array, we should choose which algorithm to use that yields the best performance. The two classes (StreamRecord and DatabaseRecord share the same interface for their own implementation of recording data via baseclass member function store() which has all the shared implementation methods (actually, api). In addition the pattern, defines a group of classes that represent a set of possible behaviors. As per theory it can defined as “A general solution to commonly occurring problems in software design”. Design Patterns: Strategy Pattern, In this sample, we have two ways of recording contact information: stream & database. Code: '; } ?> Output: One of the best example of strategy pattern is Collections.sort () method that takes Comparator parameter. Ensures only one (n = 1.. n) instance. When the showName() method is called in StrategyContext it will call the showName() method in the Strategy that it set. For example, the strategy pattern is an option if you want to change the way pages are ranked in a search engine. In the Strategy Pattern a context will choose the appropriate concrete extension of a class interface. Hey, check out our new Hooray! This pattern is also known as a policy pattern. Shape Class ( That Composites Strategy Class )