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<?php |
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namespace Faulancer\ServiceLocator; |
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use Faulancer\Exception\FactoryMayIncompatibleException; |
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use Faulancer\Exception\ServiceNotFoundException; |
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/** |
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* Class ServiceLocator |
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* |
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* @package Faulancer\ServiceLocator |
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* @author Florian Knapp <[email protected]> |
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*/ |
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class ServiceLocator implements ServiceLocatorInterface { |
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/** |
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* Holds the service locator instance |
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* @var ServiceLocator |
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*/ |
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private static $instance = null; |
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/** |
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* Holds the requested services |
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* @var array |
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*/ |
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private static $services = []; |
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/** @var array */ |
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private static $backup = []; |
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/** |
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* ServiceLocator private constructor. |
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*/ |
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private function __construct() {} |
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/** |
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* Return the instance of the service locator |
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* @return ServiceLocator |
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*/ |
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public static function instance() |
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{ |
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if (self::$instance === null) { |
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self::$instance = new self; |
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} |
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return self::$instance; |
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} |
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/** |
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* Try to get the service. |
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* Returns per default always the same instance of the service/factory. |
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* |
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* @param string $service |
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* @param bool $shared |
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* @return ServiceInterface|FactoryInterface |
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*/ |
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public function get(string $service = '', bool $shared = true) |
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{ |
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if (in_array($service, array_keys(self::$backup))) { |
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$overriddenService = self::$services[$service]; |
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self::$services[$service] = self::$backup[$service]; |
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unset(self::$backup[$service]); |
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return $overriddenService; |
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} |
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if ($shared && !empty(self::$services[$service])) { |
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return self::$services[$service]; |
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} |
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try { |
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$class = $this->_getFactory($service)->createService($this); |
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} catch (FactoryMayIncompatibleException $e) { |
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$class = $this->_getService($service); |
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} |
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self::$services[$service] = $class; |
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return $class; |
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} |
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/** |
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* Get specific service by class name |
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* |
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* @param string $service |
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* @return mixed |
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* @throws ServiceNotFoundException |
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*/ |
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private function _getService(string $service) |
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{ |
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if (!class_exists($service)) { |
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throw new ServiceNotFoundException($service . ' not found'); |
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} |
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return new $service(); |
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} |
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/** |
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* Check if we have a factory for this service |
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* |
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* @param string $service |
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* @return FactoryInterface|null |
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* @throws FactoryMayIncompatibleException |
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*/ |
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private function _getFactory(string $service) |
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{ |
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$parts = explode('\\', $service); |
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$className = array_splice($parts, count($parts) - 1, 1); |
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$class = implode('\\', $parts) . '\\Factory\\' . $className[0] . 'Factory'; |
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$isAutoDetected = class_exists($class) && in_array(FactoryInterface::class, class_implements($class)); |
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$isDirectAccess = class_exists($service) && in_array(FactoryInterface::class, class_implements($service)); |
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if ($isAutoDetected) { |
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return new $class(); |
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} |
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// This is a direct factory access |
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if ($isDirectAccess) { |
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return new $service(); |
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} |
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throw new FactoryMayIncompatibleException(); |
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} |
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/** |
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* @param string $name |
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* @param ServiceInterface $service |
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* @internal |
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*/ |
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public function set($name, $service) |
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{ |
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if (isset(self::$services[$name])) { |
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self::$backup[$name] = self::$services[$name]; |
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} |
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self::$services[$name] = $service; |
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} |
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/** |
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* Reset the service locators instance |
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* |
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* @internal |
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*/ |
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public static function destroy() |
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{ |
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self::$instance = null; |
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} |
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} |
FloKnapp /
faulancer
