PHP Classes

PHP Singleton Trait: Implement the Singleton pattern as a trait

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singletone 1.4GNU General Publi...5.4PHP 5, Language, Design Patterns, Traits
Description 

Author

Kiril Savchev

This package can implement the Singleton pattern as a trait.

It defines a trait with a function named getinstance() that creates an instance of the current class if it does not exist.

The created object is stored in static variable of the trait, so next time it is checked, the created object is returned.

The trait defines the constructor as protected and the class using the trait can override it. The entire application can get the singleton object only instance via the public static method getInstance().

When there is an attempt to clone or serialize the object, the trait throws RuntimeException.

The static property for the only instance is declared as protected and is instantiated with the static keyword to allow the access from the extended class.

Innovation Award
PHP Programming Innovation award nominee
April 2015
Number 13		 Many classes implement the singleton design pattern to assure that no more than one instance of a given class exists at a given moment.

This package implements the singleton pattern using a trait, so the it can be reused by many other packages that need to implement that same pattern.

Manuel Lemos
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Name: Kiril Savchev <contact>
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 Innovation award
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Example

<?php

require_once 'ite/structs/Singletone.php';

use ite\structs\Singletone;

class MySingletoneClass {

    use Singletone;

    public function myMethod() {
        return 'Singletone trait example';
    }

}

try {
    $MySingletoneObject = MySingletoneClass::getInstance();
    echo $MySingletoneObject->myMethod();

    $object = $MySingletoneObject();
    var_dump($object === $MySingletoneObject);

    $str = serialize($MySingletoneObject);
}
catch (RuntimeException $e) {
    try {
        $object = clone $MySingletoneObject
    }
    catch (RuntimeException $ee) {
        die($e->getMessage().'<br />'.$ee->getMessage());
    }
    die($e->getMessage());
}

?>

  Files folder image Files (2)  
File Role Description
Files folder imageite (1 directory)
Accessible without login Plain text file singletone_examples.php Example Examples with SIngletone trait

  Files folder image Files (2)  /  ite  
File Role Description
Files folder imagestructs (1 file)

  Files folder image Files (2)  /  ite  /  structs  
File Role Description
  Plain text file Singletone.php Class Singletone trait

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User Comments (6)
There's a typo in all the files.
9 years ago (pvdptje)		47%StarStarStar
There's a typo in all the files.
9 years ago (pvdptje)		47%StarStarStar
There's a typo in all the files.
9 years ago (pvdptje)		47%StarStarStar
There's a typo in all the files.
9 years ago (pvdptje)		47%StarStarStar
There's a typo in all the files.
9 years ago (pvdptje)		47%StarStarStar
There's a typo in all the files.
9 years ago (pvdptje)		47%StarStarStar
 

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