evo/patterns

Common programing patterns

Patterns

Common programing patterns for evo, _(*1)

• Singleton (trait and interface)

• Multiton (trait and interface), _(*2)

  If you don't know what a Singlton is I suggest reading about it, _(*3)

  https://en.wikipedia.org/wiki/Singleton_pattern, _(*4)

  Singleton useage, _(*5)

  ``` use evo\pattern\singleton\SingletonTrait; use evo\pattern\singleton\SingletonInterface;, <sub>(*6)</sub>

  Class Foo implements SingletonInterface{ use Singleton; protected function init(){ //stuff to do on __construct } }, <sub>(*7)</sub>

Then you can call your class like this (each additional call will return the same instance of the class)

$Foo = Foo:getInstance();, <sub>(*8)</sub>

Multiton usage

use evo\pattern\singleton\MultitonTrait; use evo\pattern\singleton\MultitonInterface;, <sub>(*9)</sub>

Class Foo implements MultitonInterface{ use Multiton; protected function init(){ //stuff to do on __construct } } ```, <sub>(*10)</sub>

Then you can call your class like this, <sub>(*11)</sub>

$Foo = Foo:getInstance();

The diffrence between them is the Multiton acts more like a container for Singlton instances. So you can call the getInstance method multiple times with diffrent aliases and get multiple copies of the class, each a singleton in it's own right. Becareful using Static proprites on multitons as they can be a bit tricky., <sub>(*12)</sub>

``` //this will produce two singleton instances of the class $Foo1 = Foo:getInstance('instance1'); $Foo2 = Foo:getInstance('instance2');, <sub>(*13)</sub>

 Install via composer 

{ "require" : { "evo/patterns" : "~1.0" } } ``` I plan to add a few more to this, as needed., <sub>(*14)</sub>