[PDF] [PDF] Design Patterns Cheat Sheet

[PDF] Design Patterns Cheat Sheet - Web Developer Juice

Creational Patterns Design Patterns Cheat Sheet Abstract Factory Provides an interface for creating families of related or dependent objects without specifying 

[PDF] Design Patterns Cheat Sheet

Creational Patterns Design Patterns Cheat Sheet Abstract Factory Provides an interface for creating families of related or dependent objects without specifying 

[PDF] Design Patterns

Design Patterns By Jason McDonald CONTENTS INCLUDE: n Chain of Responsibility n Command n Interpreter n Iterator n Mediator n Observer n Template 

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Template Method Type: Behavioral What it is: State B Strategy B Template Method B Visitor B Design Patterns: Elements of Reusable Object-Oriented 

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Deals with the problem of creating related objects without specifying the exact class of object that will be created Singleton This pattern ensures a class has only 

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In Factory Method, a derived-class override makes the object See Also Abstract Factory, Template Method BusinessObject +doSomething () # 

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Sample queues are widely used to facilitate asynchronous processing of algorithms By using a command template, the functionality that needs to be performed 

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Creational Patterns

Design Patterns Cheat Sheet

Abstract Factory

Provides an interface for creating families of related or dependent objects without specifying their concrete classes

Client

ConcreteFactory

AbstractProduct

ProductB

ProductA

+CreateProductA()+CreateProductB()

AbstractFactory

+CreateProductA()+CreateProductB()Structural Patterns

Adapter

Converts the interface of a class into another interface clients expect

Client

Adapter

+Request()

Target

+Request()Adaptee +SpecificRequest()

Structural Patterns (cont'd)

creates

Singleton

Ensure a class only has one instance and provide a global point of access to it

Singleton

-instance -Singleton()+GetInstance()

Builder

Separates the construction of a complex object from its representation so that the same construction process can create different representations.

Director

+Construct()Builder +BuildPart()

ConcreteBuilder

+BuildPart()Productbuilds

Factory Method

Defines an interface for creating an object but let subclasses decide which class to instantiate

Product

ConcreteProduct

Creator

+FactoryMethod()

ConcreteCreator

+FactoryMethod()createsPrototype

Specifies the kinds of objects to create using a prototypical instance and create new objects by copying this prototype

Client

ConcretePrototype1

+Clone()

Prototype

+Clone()

ConcretePrototype2

+Clone() Proxy Provides a surrogate or placeholder for another object to control access to it

Subject

+Request()

Client

RealSubject

+Request() Proxy +Request()Flyweight Uses sharing to support large numbers of fine-grained objects efficiently

Flyweight

+Operation(state)

FlyweightFactory

+GetFlyweight(key)

Flyweight

+Operation(state)

UnsharedFlyweight

+Operation(state)

Client

Bridge

Decouples an abstraction from its implementation so that the two can vary independently

Client

Abstraction

+Operation()ConcreteImplementorA +OperationImpl()

Implementor

+OperationImpl()

ConcreteImplementorB

+OperationImpl()

Composite

Composes objects into tree structures to represent part-whole hierarchies

Client

Component

Leaf +Operation()

Composite

Attaches additional responsibilities to an object dynamically

Component

+Operation()

Decorator

+Operation()

ConcreteComponent

+Operation()

ConcreteDecorator

+Operation()+AddedBehavior()

Facade

Provides a unified interface to a set of interfaces in a subsystem

Facade

Subsystem

Behavioral Patterns

Design Patterns Cheat Sheet

Chain of Responsibility

Avoids coupling the sender of a request to its receiver by giving more than one object a chance to handle the request

Client

ConcreteHandler1

+HandleRequest()

Handler

+HandleRequest()

ConcreteHandler2

+HandleRequest()

Command

Encapsulates a request as an object, thereby letting you parameterize clients with different requests, queue or log requests, and support undoable operations

ClientInvoker

Command

+Execute()ConcreteCommand +Execute()Receiver +Action()

Interpreter

Given a language, defines a representation for its grammar along with an interpreter that uses the representation to interpret sentences in the language

ClientContext

TerminalExpression

+Interpret(context)

AbstractExpression

+Interpret(context)

NonterminalExpression

+Interpret(context)

Iterator

Given a language, defines a representation for its grammar along with an interpreter that uses the representation to interpret sentences in the language

Client

Aggregate

+CreateIterator()ConcreteAggregate +CreateIterator()

Iterator

+First()+Next()+CurrentItem()

ConcreteIterator

+Next()

Mediator

Defines an object that encapsulates how a set of objects interact

Mediator

Colleague

ConcreteColleague1

ConcreteColleague2

ConcreteMediator

Memento

Without violating encapsulation, capture and externalize an object's internal state so that the object can be restored to this state later

Caretaker

Originator

+SetMemento(memento) +CreateMemento()Memento +GetState() +SetState()

Behavioral Patterns (cont'd)

Observer

Defines a one-to-many dependency between objects so that when one object changes state all its dependents are notified and updated automatically

Observer

+Update()

Subject

ConcreteSubject

-subjectStateConcreteObserver -observerState State Allows an object to alter its behavior when its internal state changes State +Handle()

ConcreteStateA

+Handle()

ConcreteStateB

+Handle()

Context

+Request()

Strategy

Defines a family of algorithms, encapsulate each one, and make them interchangeable

Strategy

+AlgorithmInterface()

StrategyA

+AlgorithmInterface()

StrategyB

+AlgorithmInterface()

Context

TemplateMethod

Defines the skeleton of an algorithm in an operation, deferring some steps to subclasses

AbstractClass

ConcreteClass

TemplateMethod

Represents an operation to be performed on the elements of an object structure

Client

Visitor

ConcreteElementA

+Accept(visitor)

Element

+Accept(visitor)

ConcreteElementB

+Accept(visitor)

ConcreteVisitor

executes -state-state +HandleRequest() +Update() +ContextInterface()quotesdbs_dbs8.pdfusesText_14