Patterns In Your PastryPatterns In Your Pastry

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James Wattsjames.watts @ cakephp.org

CakeFest 2013: The CakePHP ConferenceAugust 31st, 2013 – San Francisco, USA

WARNINGWARNING

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WARNINGWARNING

You may feel hungryYou may feel hungryat some point duringat some point during

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Design PatternsDesign Patterns

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There are many!There are many!

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MVCMVC

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- M

- V

- C

- Model

- V

- C

- Model

- View

- C

- Model

- View

- Controller

- Business

- Presentation

- Mediation

- Business

- Presentation

- Mediation

- Business

- Presentation

- Mediation

“ separation of concerns ”

Neither layer . . .

Neither layer . . .

- wants to know

Neither layer . . .

- wants to know

- should know

Neither layer . . .

- wants to know

- should know

- or can know

Neither layer . . .

- wants to know

- should know

- or can know

about the other

Front ControllerFront Controller

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Single Point of Entry

Single Point of EntryObvious Jokes Omitted

Template MethodTemplate Method

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Override steps

Of a process

Without Modifying

The Process

“ Hooks “

FactoryFactory

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Create an Object

Without exposing

Instantiation logic

Animal

Animal

Cat

Animal Dog

Cat

Animal Dog

Cat

Moose

Animal Factory

Create ( 'dog' )

UtilityUtilityImage credit: Image credit: Kiran Foster (rueful)Kiran Foster (rueful) - http://www.flickr.com/photos/rueful/5697846897 - http://www.flickr.com/photos/rueful/5697846897

Don't Require

Instantiation

Static

Active RecordActive Record

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ORM

ORMObject Relational Mapping

Database Row = Object

Array

CRUD

CRUDCreate, Read, Update, Delete

DecoratorDecorator

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Add Behaviors

To an Object

Without Modifying

Other Instances

“ MIXIN “ OR “ TRAIT “

SingletonSingleton

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There can only be one

Only Allow a

Single Instance

StrategyStrategy

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Change a Process

Based on Criteria

Common Interface

Variable process

AdaptorAdaptor

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Adapts an Interface

Normalization

“ Wrapper ”

ObserverObserver

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Notifications

State Change

Event Driven