Design PatternsPHP

Un design pattern o patrón de diseño es una solución

reutilizable frente a problemas frecuentes en el

diseño de software.

Design Patterns

¿Por qué utilizarlos?

Acelera el desarrollo

Soluciones probadas frente a paradigmas de desarrollo

Mejora la legibilidad del código

Factory method

El factory pattern es una clase que tiene una sierie de methods que permiten

crear objetos.

Command

Un objeto es utilizado para representar y encapsular todo la información necesaria para

llamar luego a un method. Esta información incluye el method name, el objeto dueño del

method y los valores los parámetros del method.

Cadena de responsabilidades

Avoid coupling the sender of a request to its receiver by giving more than one object a

chance to handle a request. Chain the receiving objects and pass the request along the chain

until an object handles it.A mechanism also exists for adding new

processing objects to the end of this chain.

Variación: árbol de responsabilidad..

This pattern shares some structural similarities with Java exceptions: either they are handled or passed on.

This pattern is useful for hierarchical structures where a request can be handled at multiple layers.

Like our GUI event handling is done hierarchically. If an object doesn't want to handle an event it can delegate it to its parent, up the chain.

Decorator

Attach additional responsibilities to an object dynamically. Decorators provide a flexible alternative to subclassing for extending

functionality

The original code is open to extension but closed to modification

“Open/closed principle”

CompositeThe composite pattern describes that a group of objects are to be treated in the same way as a

single instance of an object.Compose objects into tree structures to

represent part-whole hierarchies. Composite lets clients treat individual objects and

compositions of objects uniformly.

State

Allow an object to alter its behavior when its internal state changes.

The object will appear to change its class.