DesignPatternsPHP/Multiton/Multiton.php at master · NandoKstroNet/DesignPatternsPHP · GitHub

History

87 lines (75 loc) · 1.75 KB

Raw

<?php

namespace DesignPatterns;

/**

* Multiton pattern

* --------------------------------------------------------------------------------------------------------------

* THIS IS CONSIDERED TO BE AN ANTI-PATTERN! FOR BETTER TESTABILITY AND MAINTAINABILITY USE DEPENDENCY INJECTION!

* --------------------------------------------------------------------------------------------------------------

* Purpose:

* to have only a list of named instances that are used, like a singleton but with n instances

* Examples:

* - 2 DB Connectors, e.g. one for MySQL, the other for SQLite

* - multiple Loggers (one for debug messages, one for errors)

class Multiton

{

/**

* the first instance

const INSTANCE_1 = '1';

/**

* the second instance

const INSTANCE_2 = '2';

/**

* holds the named instances

* @var array

private static $instances = array();

/**

* should not be called from outside: private!

private function __construct()

{

}

/**

* gets the instance with the given name, e.g. Multiton::INSTANCE_1

* uses lazy initialization

* @param string $instanceName

* @return Multiton

public static function getInstance($instanceName)

{

if (!array_key_exists($instanceName, self::$instances)) {

self::$instances[$instanceName] = new self();

}

return self::$instances[$instanceName];

}

/**

* prevent instance from being cloned

* @return void

private function __clone()

{

}

/**

* prevent instance from being unserialized

* @return void

private function __wakeup()

{

}

DesignPatternsPHP/Multiton/Multiton.php at master · NandoKstroNet/DesignPatternsPHP · GitHub

Expand file tree

Breadcrumbs

Multiton.php

Latest commit

History

Breadcrumbs

Multiton.php

File metadata and controls