Adapter Design Pattern
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This presentation contains a specification of adapter design pattern, an example of its usage, advantage and disadvantage of it.
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Bt0066 database management system2
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Spark Summit EU talk by Mikhail Semeniuk Hollin Wilkins
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Adapter Design Pattern
- 1. ADAPTER DESIGN PATTERN MHD SALEM KABBANI
- 2. HOW ADAPTER WORKS UK power plugEU socket Adapter
- 3. PROBLEM • Client should works with specific interface (Interface A), but the logic is under another interface (Interface B) for some reason (e.g. external library). Interface A Syste m Interface B Syste m
- 4. ADAPTER PATTERN • Adapter pattern is one of the structural design patterns. • It works as a bridge between two incompatible interfaces. • This pattern involves a single class which is responsible to join functionalities of independent or incompatible interfaces. • Adapter doesn’t add new behavior to our interface.
- 5. SOLUTION • We create adapter class that implements our Interface A and has a reference to Interface B as a member. • In the implemented methods from Interface A, we call Interface B methods from its reference. Interface B Adapter (implements Interface A) Syste m
- 6. UML
- 8. IMPLEMENTATION EnemySoldier Does a Damage EnemySoldier moves ----------------- EnemyWizard casts a spell EnemyWizard teleports ----------------- EnemyWizard casts a
- 9. PROS. VS CONS. • The overall complexity of the code increases because you need to add a set of new interfaces and classes. • Single Responsibility Principle: separate data conversion code from the primary business logic of the program. • Open/Closed Principle: add new types of adapters into the program without modifying the existing client code.
Editor's Notes
- The Single Responsibility Principle — Classes should have a single responsibility and thus only a single reason to change. Open/Closed Principle — Classes and other entities should be open for extension but closed for modification. ------------ because they work with the adapters through the client interface