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<?php |
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namespace Anax\DI; |
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use Anax\DI\Exception\Exception; |
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use Anax\DI\Exception\NotFoundException; |
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use Psr\Container\ContainerInterface; |
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/** |
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* A dependency/service container implementing the interface FIG PSR-11. |
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* It can contain any of the fraework services, using lazy loading. |
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*/ |
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class DI implements ContainerInterface |
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{ |
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/** |
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* @var array $loaded Store all lazy loaded services, ready to be |
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* instantiated. |
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* @var array $active A service is instantiated into this array, |
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* once its accessed. |
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*/ |
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protected $loaded = []; |
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protected $active = []; |
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/** |
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* Finds an entry in the container by its identifier and returns it. |
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* If the service is active/singelton then that instance is returned, |
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* else the service is loaded and a new instance is returned. |
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* |
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* @param string $service Identifier of the entry to look for. |
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* |
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* @throws NotFoundException No entry was found for this identifier. |
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* @throws Exception Error while retrieving the entry. |
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* |
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* @return mixed Entry. |
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*/ |
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public function get($service) |
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{ |
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if (!$this->has($service)) { |
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throw new NotFoundException("The service '$service' is not loaded in the DI-container."); |
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} |
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if (isset($this->active[$service]) |
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&& $this->loaded[$service]['singleton']) { |
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return $this->active[$service]; |
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} |
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return $this->load($service); |
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} |
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/** |
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* Load a prepared service object and create an instance of it. |
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* |
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* @param string $service as a service label, naming this service. |
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* |
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* @throws Exception when service could not be loaded. |
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* |
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* @return object as instance of the service object. |
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*/ |
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protected function load($service) |
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{ |
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$sol = $this->loaded[$service]['loader'] ?? null; |
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if (is_callable($sol)) { |
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// Load by calling a function |
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try { |
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$this->active[$service] = $sol(); |
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} catch (\Exception $e) { |
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throw new Exception( |
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"Could not load service '$service'." |
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. "Failed in the callback that instantiates the service. " |
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. $e->getMessage() |
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); |
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} |
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} elseif (is_object($sol)) { |
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// Load by pre-instantiated object |
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$this->active[$service] = $sol; |
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} elseif (is_string($sol)) { |
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// Load by creating a new object from class-string |
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if (!class_exists($sol)) { |
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throw new Exception( |
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"Could not load service '$service'." |
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. "Class '$sol' does not exists." |
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); |
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} |
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$this->active[$service] = new $sol(); |
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} else { |
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throw new Exception("The service '$service' has no init mechanism."); |
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} |
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$this->$service = $this->active[$service]; |
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return $this->active[$service]; |
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} |
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/** |
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* Returns true if the container can return an entry for the given |
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* identifier, otherwise false |
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* |
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* @param string $service Identifier of the entry to look for. |
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* |
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* @return boolean |
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*/ |
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public function has($service) |
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{ |
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return isset($this->loaded[$service]); |
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} |
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/** |
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* Set a service and connect it to a task which creates the object |
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* (lazy loading). |
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* |
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* @param string $service as a service label, naming this service. |
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* @param mixed $loader contains a pre-defined object, a string with |
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* class name or an callable which returns an |
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* instance of the service object. Its the way |
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* to actually load, insantiate, the service |
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* object. |
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* |
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* @return void |
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*/ |
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public function set($service, $loader) |
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{ |
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$this->loaded[$service]['loader'] = $loader; |
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$this->loaded[$service]['singleton'] = false; |
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} |
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/** |
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* Set a singleton service and connect it to a task which creates the |
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* object (lazy loading). |
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* |
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* @param string $service as a service label, naming this service. |
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* @param mixed $loader contains a pre-defined object, a string with |
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* class name or an callable which returns an |
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* instance of the service object. Its the way |
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* to actually load, insantiate, the service |
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* object. |
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* |
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* @return void |
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*/ |
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public function setShared($service, $loader) |
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{ |
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$this->loaded[$service]['loader'] = $loader; |
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$this->loaded[$service]['singleton'] = true; |
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} |
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/** |
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* Return an array with all loaded services names. |
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* |
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* @return array |
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*/ |
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public function getServices() |
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{ |
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return array_keys($this->loaded); |
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} |
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/** |
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* Return an array with all active services names. |
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* |
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* @return array |
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*/ |
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public function getActiveServices() |
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{ |
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return array_keys($this->active); |
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} |
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} |
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canax /
di
