Design Patterns - 04 Adapter and Facade Pattern

Aug 10, 201010 likes4,943 views

Fourth presentation of a multi part series covering design patterns. This one is about adapter and facade design patterns.

04 Adapter and Façade PatternDesign Patterns© Prafulla Paraskar 2010

AdapterStructural Design Pattern© Prafulla Paraskar 2010

DefinitionThe adapter pattern (often referred to as the wrapper pattern or simply a wrapper) is a design pattern that translates one interface for a class into a compatible interface. (wikipedia)© Prafulla Paraskar 2010

Adapter Pattern – Explained (1/2)© Prafulla Paraskar 2010

Adapter Pattern – Explained (2/2) An adapter allows classes to work together that normally could not because of incompatible interfaces, by providing its interface to clients while using the original interface.The adapter translates calls to its interface into calls to the original interface, and the amount of code necessary to do this is typically small.The adapter is also responsible for transforming data into appropriate forms.© Prafulla Paraskar 2010

Adapter Pattern – Types of AdaptersClass adapterSimple and versatile, invisible to the client.Object adapterExtensible to subclasses of the adapter.Two-way adapterEnables different clients to view an object differently.Pluggable adapterPresence of adapter is transparent; it can be put in and taken out. Several adapter can be active.© Prafulla Paraskar 2010

Adapter Pattern – UML Diagram© Prafulla Paraskar 2010

Adapter Pattern – Real World SamplesAC adaptorsCar charger for mobile phonesCOM InterOp in .NETSQLAdapter in .NET© Prafulla Paraskar 2010

Adapter Pattern – GuidelinesYou have :A domain specific interface.A Class to connect to with a mismatching interface.You Want :Create a reusable class to cooperate with yet-to-be-built classes.Change the names of methods as called and as implemented.Support different sets of methods for different purposes.© Prafulla Paraskar 2010

FacadeStructural Design Pattern© Prafulla Paraskar 2010

DefinitionA facade is an object that provides a simplified interface to a larger body of code, such as a class library (wikipedia).© Prafulla Paraskar 2010

Façade Pattern – Explained (1/2)© Prafulla Paraskar 2010

Façade Pattern – Explained (2/2)The name is by analogy to an architectural facade.A facade can:make a software library easier to use and understand and test, since the facade has convenient methods for common tasks.make code that uses the library more readable, for the same reason.reduce dependencies of outside code on the inner workings of a library, since most code uses the facade, thus allowing more flexibility in developing the system.wrap a poorly-designed collection of APIs with a single well-designed API (as per task needs).© Prafulla Paraskar 2010

Façade Pattern – Types of AdaptersOpaqueSubsystem operations can only be called through the Façade.TransparentSubsystem operations can be called directly as well as through the Façade.SingletonOnly one instance of the Façade is meaningful.© Prafulla Paraskar 2010

Façade Pattern – UML Diagram© Prafulla Paraskar 2010

Façade Pattern – Real World SamplesWedding planners / Event management.DirectX / OpenGLOnline bill paymentMacros in MS Office© Prafulla Paraskar 2010

Façade Pattern – GuidelinesWhen:A system has several identifiable subsystems and:The abstractions and implementations of a subsystem are tightly coupled.The system evolves and gets more complex, but early adapters might want to retain their simple views.You want to provide alternative novice, intermediate and power user interfaces.There is a need for an entry point to each level of layered software. © Prafulla Paraskar 2010

Thank you!http://geekswithblogs.net/technomadPresentation by Prafulla Paraskar prafulla.paraskar@s1.com© 2010 S1 India Pvt. Ltd.Presentation by Prafulla Paraskar eprafulla@gmail.com© 2010 Prafulla Paraskar

This document discusses the facade design pattern. The facade pattern provides a simplified interface to a more complex subsystem. It decouples the subsystem from the client and makes the subsystem easier to use. A facade acts as a front-facing interface that hides the underlying complexities of the subsystem and delegates client requests to appropriate subsystem classes. This reduces dependencies between subsystems and promotes loose coupling. The facade pattern is useful for layering subsystems and simplifying access to them through a single interface.

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Design Patterns - 04 Adapter and Facade Pattern

3. DefinitionThe adapter pattern (often referred to as the wrapper pattern or simply a wrapper) is a design pattern that translates one interface for a class into a compatible interface. (wikipedia)© Prafulla Paraskar 2010

5. Adapter Pattern – Explained (2/2) An adapter allows classes to work together that normally could not because of incompatible interfaces, by providing its interface to clients while using the original interface.The adapter translates calls to its interface into calls to the original interface, and the amount of code necessary to do this is typically small.The adapter is also responsible for transforming data into appropriate forms.© Prafulla Paraskar 2010

6. Adapter Pattern – Types of AdaptersClass adapterSimple and versatile, invisible to the client.Object adapterExtensible to subclasses of the adapter.Two-way adapterEnables different clients to view an object differently.Pluggable adapterPresence of adapter is transparent; it can be put in and taken out. Several adapter can be active.© Prafulla Paraskar 2010

8. Adapter Pattern – Real World SamplesAC adaptorsCar charger for mobile phonesCOM InterOp in .NETSQLAdapter in .NET© Prafulla Paraskar 2010

9. Adapter Pattern – GuidelinesYou have :A domain specific interface.A Class to connect to with a mismatching interface.You Want :Create a reusable class to cooperate with yet-to-be-built classes.Change the names of methods as called and as implemented.Support different sets of methods for different purposes.© Prafulla Paraskar 2010

11. DefinitionA facade is an object that provides a simplified interface to a larger body of code, such as a class library (wikipedia).© Prafulla Paraskar 2010

13. Façade Pattern – Explained (2/2)The name is by analogy to an architectural facade.A facade can:make a software library easier to use and understand and test, since the facade has convenient methods for common tasks.make code that uses the library more readable, for the same reason.reduce dependencies of outside code on the inner workings of a library, since most code uses the facade, thus allowing more flexibility in developing the system.wrap a poorly-designed collection of APIs with a single well-designed API (as per task needs).© Prafulla Paraskar 2010

14. Façade Pattern – Types of AdaptersOpaqueSubsystem operations can only be called through the Façade.TransparentSubsystem operations can be called directly as well as through the Façade.SingletonOnly one instance of the Façade is meaningful.© Prafulla Paraskar 2010

16. Façade Pattern – Real World SamplesWedding planners / Event management.DirectX / OpenGLOnline bill paymentMacros in MS Office© Prafulla Paraskar 2010

17. Façade Pattern – GuidelinesWhen:A system has several identifiable subsystems and:The abstractions and implementations of a subsystem are tightly coupled.The system evolves and gets more complex, but early adapters might want to retain their simple views.You want to provide alternative novice, intermediate and power user interfaces.There is a need for an entry point to each level of layered software. © Prafulla Paraskar 2010

18. Thank you!http://geekswithblogs.net/technomadPresentation by Prafulla Paraskar [email protected]© 2010 S1 India Pvt. Ltd.Presentation by Prafulla Paraskar [email protected]© 2010 Prafulla Paraskar

Design Patterns - 04 Adapter and Facade Pattern

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