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<?php |
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/** |
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* @author Marwan Al-Soltany <[email protected]> |
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* @copyright Marwan Al-Soltany 2020 |
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* For the full copyright and license information, please view |
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* the LICENSE file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace MAKS\AmqpAgent\Helper; |
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use MAKS\AmqpAgent\Exception\SingletonViolationException; |
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/** |
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* An abstract class implementing the fundamental functionality of a singleton. |
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* @since 1.0.0 |
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*/ |
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abstract class Singleton |
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{ |
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/** |
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* Each sub-class of the Singleton stores its own instance here. |
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* @var array |
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*/ |
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private static $instances = []; |
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/** |
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* Can't be private if we want to allow sub-classing. |
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*/ |
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protected function __construct() |
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{ |
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// |
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} |
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/** |
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* Cloning is not permitted for singletons. |
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*/ |
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public function __clone() |
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{ |
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throw new SingletonViolationException("Bad call. Cannot clone a singleton!"); |
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} |
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/** |
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* Serialization is not permitted for singletons. |
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*/ |
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public function __sleep() |
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{ |
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throw new SingletonViolationException("Bad call. Cannot serialize a singleton!"); |
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} |
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/** |
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* Unserialization is not permitted for singletons. |
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*/ |
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public function __wakeup() |
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{ |
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throw new SingletonViolationException("Bad call. Cannot unserialize a singleton!"); |
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} |
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/** |
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* The method used to get the singleton's instance. |
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* @return self |
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*/ |
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public static function getInstance() |
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{ |
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$subclass = static::class; |
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if (!isset(self::$instances[$subclass])) { |
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self::$instances[$subclass] = new static(); |
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} |
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return self::$instances[$subclass]; |
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} |
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/** |
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* Destroys the singleton's instance it was called on. |
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* @param self &$object The instance it was called on. |
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* @return void |
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*/ |
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public function destroyInstance(&$object) |
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{ |
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if (is_subclass_of($object, __CLASS__)) { |
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$object = null; |
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} |
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} |
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} |
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MarwanAlsoltany /
amqp-agent
