Material and some slide content from: - GoF Design Patterns Book. Design Patterns #1. Reid Holmes. Lecture 11 - Tuesday October
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1 Material and some slide content from: - GoF Design Patterns Book Design Patterns #1 Reid Holmes Lecture 11 - Tuesday October
2 GoF design patterns!"#$%&'()*$+,--&.*' /.&,-("*, ,0 4&5,6(".,0 #,3-".7$8&-5"9 :9,<-".$=$30,'' B*-&.<.&-&. D&><0,-&$8&-5"9 30,'' :;'-.,3-$#,3-".7 :9,<-".=";?&3- /5,(*$"C$.&'<"*'(;(0(-7 42(09&. 4.(9)& /">>,*9 +."-"-7<& /"><"'(-& B-&.,-". 1(*)0&-"* %&3".,-". 8&9(,-". 8&>&*-" E;'&.6&. #,3,9& ";?&3- +."A7 1-,-& 1-.,-&)7 F('(-".
3 Singleton Intent: Ensure a class has only one instance Motivation:? Applicability: Situations when there must be only one copy of a class.
4 Singleton Structure: Participants: an instance operation that retrieves the instance. may be responsible for creating instance.
5 Singleton Collaborations All collaboration via instance operation. Consequences: Controlled access to instance. Reduced name space. Permits variable number of instances. More flexible than class operations.
6 Singleton Implementation: 1.? 2.? Related to: Can be used to create Abstract Factory, Builder, and Prototype.
7 Abstract factory Intent: Provide an interface for creating families of related objects without specifying their concrete classes Motivation: Consider a multi-platform UI toolkit. A WidgetFactory can provide an interface to make sure the right widget is instantiated for each platform. Applicability: When a system should be independent of how its products are created and represented. A system contains multiple families of products.?
8 Abstract factory Structure Participants: Abstract/Concrete Factory Abstract/Concrete Product Client
9 Abstract factory Collaborations Usually only one Abstract Factory (singleton). Objects are created by concrete factories. Consequences: Isolates concrete classes from clients.? Makes exchanging families easy.? Makes adding products hard.?
10 Abstract factory Implementation: Create abstract factory interface. Use factory method to create descriptive names. Create concrete products/factories.? Known uses: Frequently used in widget toolkits. Related to: Often implemented with Factory Method or Prototypes. Concrete factories are often Singletons.
11 Builder Intent: Separate the construction of complex objects from its representation. Motivation: Consider a text reader that must convert back and forth between RTF, ASCII, and TeX. The ordering / combinations are unbounded requiring a flexible composition mechanism. Applicability:? When the construction process must allow for different representation.
12 Builder Structure Participants: Builder / Concrete Builder Director Product
13 Builder Collaborations: Client creates director with desired builder. Director tells builder to build parts. Client retrieves parts from builder. Consequences: Vary internal representation. Isolates code from construction / representation.?
14 Builder Implementation: 1) Create flexible construction interface. Allow new parts to be appended to the existing whole. 2) Don t bother with abstract products, they usually vary enough that it doesn t help much. 3) Don t use interface for Builder; empty methods allow ConcreteBuilders to choose what methods to implement. Known uses: Smalltalk parser & ClassBuilder. Related to: Similar to Abstract Factory. Frequently builds Composite objects.
15 Builder Example REID HOLMES - SE2: SOFTWARE DESIGN & ARCHITECTURE
16 Proxy Intent: Provide a placeholder to control access to another object. Motivation: One reason to control access is cost: consider an object that is expensive to populate entirely but cheap to partially populate. (e.g., remote object, large file from disk, etc.) Applicability: (When a more versatile reference is needed.) Remote:? Virtual:? Protection: Protect access to objects. Smart reference: Performs additional actions.
17 Proxy Structure Participants: Proxy Subject / RealSubject
18 Proxy Collaborations: Client interacts with proxy. Proxy forwards req. to RealSubject as required. Consequences: Remote:? Virtual:? Protection: Housekeeping / auth can occur.
19 Proxy Implementation: 1) Create common interface for Proxy/ RealSubject. 2) Reference Proxy in Client. 3) Proxy forwards requests as necessary. Known uses: Image manipulation / RPC. Related to: Similar to Adapter and Decorator. Decorators add responsibilities while proxies serve as mediators.
20 Proxy wrt Project REID HOLMES - SE2: SOFTWARE DESIGN & ARCHITECTURE
21 Facade Intent: Provide a unified, higher-level, interface to a whole module making it easier to use. Motivation:? Applicability: When you want a simple interface to a complex subsystem.? You want to layer your subsystems.
22 Facade REID HOLMES - SE2: SOFTWARE DESIGN & ARCHITECTURE
23 Facade Participants: Facade Subsystem classes Collaborations: Clients interact subsystem via Facade. Consequences:? Promotes? Doesn t prevent access to subsystem classes.
24 Facade Implementation: 1) Analyze client / subsystem tangling. 2) Create interface. Abstract factories can also be used to add further decoupling. Known uses: Varied. Related to: Abstract Factory can be used with Facade to create subsystem objects. Facades are frequently Singletons. Abstracts functionality similar to Mediator but does not concentrate on communication.
25 Facade wrt Project REID HOLMES - SE2: SOFTWARE DESIGN & ARCHITECTURE
26 Activity 5 mins: Right side: Develop a use for a facade pattern for your system. Left side: Develop a usage of a proxy pattern for your system. 10 mins (5 / group): Match up with team from other side of room. Explain your pattern and how it improves your system s design.
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