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<?php |
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namespace Fwlib\Base; |
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use Fwlib\Base\Exception\ServiceInstanceCreationFailException; |
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/** |
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* Trait for service container |
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* |
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* Usually only one container instance is need, so use Singleton pattern. |
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* |
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* Service name better use camelCase or StudyCaps style. |
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* |
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* @copyright Copyright 2013-2015 Fwolf |
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* @license http://www.gnu.org/licenses/lgpl.html LGPL-3.0+ |
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* @see ServiceContainerInterface |
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*/ |
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trait ServiceContainerTrait |
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{ |
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use SingletonTrait; |
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/** |
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* Service class map |
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* |
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* These class can have static getInstance() method for reuse, see |
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* {@see SingleInstanceTrait}. |
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* |
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* For easy inherit and not conflict with user registered class, do not |
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* set value here, set them in {@see buildClassMap()}. |
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* |
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* @var string[] |
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*/ |
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protected $classMap = []; |
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/** |
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* Service instances |
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* |
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* @var object[] |
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*/ |
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protected $instances = []; |
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/** |
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* Constructor |
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*/ |
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protected function __construct() |
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{ |
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$this->classMap = $this->buildClassMap(); |
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} |
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/** |
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* Build service class map |
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* |
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* @return string[] |
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*/ |
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protected function buildClassMap() |
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{ |
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// Dummy for inherit and extend by child class. |
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$classMap = []; |
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return $classMap; |
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} |
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/** |
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* Create service instance by name |
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* |
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* Will try below sequence to create instance: |
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* |
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* - createName() in this container |
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* - Name::getInstance() |
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* - new Name |
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* |
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* @param string $name |
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* @return object |
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* @throws ServiceInstanceCreationFailException |
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*/ |
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protected function createService($name) |
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{ |
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$service = null; |
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$name = $this->unifyNameStyle($name); |
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$method = 'create' . $name; |
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if (method_exists($this, $method)) { |
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$service = $this->$method(); |
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} elseif (isset($this->classMap[$name])) { |
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$className = $this->classMap[$name]; |
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// Singleton or single instance class instantiate diffs |
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if (method_exists($className, 'getInstance')) { |
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$service = $className::getInstance(); |
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} else { |
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$service = new $className; |
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} |
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} else { |
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throw (new ServiceInstanceCreationFailException) |
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->setServiceName($name); |
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} |
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return $service; |
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} |
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/** |
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* Get service instance by name |
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* |
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* The return type maybe variable, so this method is inner use only. Make |
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* getFoo() methods in client class to identify return type. |
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* |
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* When $forcenew is true, it will ignore exists service instance and |
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* create a new one-time use instance, which will not be stored in instance |
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* array. |
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* |
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* $forcenew does not affect instances create according to class map, |
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* because they use singleton or single instance pattern. |
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* |
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* @param string $name |
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* @param boolean $forcenew |
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* @return object |
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*/ |
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protected function get($name, $forcenew = false) |
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{ |
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$name = $this->unifyNameStyle($name); |
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if ($forcenew) { |
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return $this->createService($name); |
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} else { |
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if (!isset($this->instances[$name])) { |
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$this->instances[$name] = $this->createService($name); |
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} |
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return $this->instances[$name]; |
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} |
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} |
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/** |
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* @see ServiceContainerInterface::getRegistered() |
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* |
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* @param string $name |
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* @return object |
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*/ |
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public function getRegistered($name) |
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{ |
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$name = $this->unifyNameStyle($name); |
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return $this->get($name, false); |
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} |
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/** |
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* @see ServiceContainerInterface::register() |
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* |
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* @param string $name |
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* @param string|object $service |
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* @return static |
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*/ |
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public function register($name, $service) |
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{ |
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$name = $this->unifyNameStyle($name); |
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if (is_string($service)) { |
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return $this->registerClass($name, $service); |
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} else { |
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return $this->registerInstance($name, $service); |
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} |
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} |
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/** |
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* @see ServiceContainerInterface::registerClass() |
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* |
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* @param string $name |
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* @param string $className Full qualified name without leading '\' |
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* @return static |
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*/ |
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public function registerClass($name, $className) |
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{ |
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$name = $this->unifyNameStyle($name); |
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$this->classMap[$name] = $className; |
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return $this; |
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} |
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/** |
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* @see ServiceContainerInterface::registerInstance() |
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* |
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* @param string $name |
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* @param object $instance |
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* @return static |
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*/ |
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public function registerInstance($name, $instance) |
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{ |
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$name = $this->unifyNameStyle($name); |
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$this->instances[$name] = $instance; |
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return $this; |
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} |
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/** |
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* Unify service name case style |
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* |
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* @param string $name |
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* @return string |
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*/ |
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protected function unifyNameStyle($name) |
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{ |
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return ucfirst($name); |
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} |
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} |
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This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently.
Both the
$myVar
assignment in line 1 and the$higher
assignment in line 2 are dead. The first because$myVar
is never used and the second because$higher
is always overwritten for every possible time line.