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Merge pull request #192 from marius-rizac/fixed-wrong-singleton-pattern

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Fixed wrong implementation of Singleton Pattern
This commit is contained in:
Dominik Liebler
2015-12-18 10:17:55 +01:00
parent f36bdcad9c df060dab97
commit 2c655a5cba
3 changed files with 37 additions and 4 deletions
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12
Creational/Singleton/Singleton.php
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@@ -2,6 +2,8 @@
namespace DesignPatterns\Creational\Singleton;
use DesignPatterns\Creational\Singleton\SingletonPatternViolationException;
/**
* class Singleton
*/
@@ -36,19 +38,21 @@ class Singleton
/**
* prevent the instance from being cloned
*
* @throws SingletonPatternViolationException
* @return void
*/
private function __clone()
public final function __clone()
{
throw new SingletonPatternViolationException('This is a Singleton. Clone is forbidden');
}
/**
* prevent from being unserialized
*
* @throws SingletonPatternViolationException
* @return void
*/
private function __wakeup()
public final function __wakeup()
{
throw new SingletonPatternViolationException('This is a Singleton. __wakeup usage is forbidden');
}
}

8
Creational/Singleton/SingletonPatternViolationException.php Normal file
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@@ -0,0 +1,8 @@
<?php
namespace DesignPatterns\Creational\Singleton;
class SingletonPatternViolationException extends \Exception
{
}

21
Creational/Singleton/Tests/SingletonTest.php
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@@ -26,4 +26,25 @@ class SingletonTest extends \PHPUnit_Framework_TestCase
$meth = $refl->getMethod('__construct');
$this->assertTrue($meth->isPrivate());
}
/**
* @expectedException \DesignPatterns\Creational\Singleton\SingletonPatternViolationException
* @return void
*/
public function testNoCloneAllowed()
{
$obj1 = Singleton::getInstance();
$obj2 = clone $obj1;
}
/**
* @expectedException \DesignPatterns\Creational\Singleton\SingletonPatternViolationException
* @return void
*/
public function testNoSerializationAllowed()
{
$obj1 = Singleton::getInstance();
$serialized = serialize($obj1);
$obj2 = unserialize($serialized);
}
}