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<?php |
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namespace PhpDDD\DomainDrivenDesign\Command; |
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use PhpDDD\DomainDrivenDesign\Exception\CommandDispatcherException; |
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/** |
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* Implementation of the CommandDispatcherInterface. |
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*/ |
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final class CommandDispatcher implements CommandDispatcherInterface |
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{ |
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/** |
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* List of command handler subscribed per command. |
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* This is mainly used for debug (exceptions). |
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* |
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* @var CommandHandlerInterface[] |
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*/ |
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private $handlers = []; |
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/** |
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* List of methods to call when a command is triggered. |
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* |
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* @var callable[] |
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*/ |
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private $handlingMethods = []; |
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/** |
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* Get the handler link to the command (if any) and run the callable associated. |
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* This method will try to look for handlers registered to: |
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* - the command class name |
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* - a parent of the current command |
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* - an interface that the current command may implement. |
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* |
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* @param AbstractCommand $command |
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* |
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* @return AbstractCommand |
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*/ |
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public function handle(AbstractCommand $command) |
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{ |
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$handlingMethods = $this->getHandlingMethodForCommand($command); |
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$nbMethods = count($handlingMethods); |
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if (0 === $nbMethods) { |
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throw CommandDispatcherException::commandHandlerNotFound($command); |
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} elseif (1 !== $nbMethods) { |
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throw CommandDispatcherException::tooManyCommandHandler($command, $this->getHandlerForCommand($command)); |
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} |
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$method = current($handlingMethods); |
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call_user_func($method, $command); |
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return $command; |
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} |
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/** |
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* @param CommandHandlerInterface $handler |
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*/ |
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public function register(CommandHandlerInterface $handler) |
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{ |
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foreach ($handler->getHandlingMethods() as $commandClassName => $callable) { |
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if (isset($this->handlers[$commandClassName])) { |
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throw CommandDispatcherException::commandHandlerAlreadyDefinedForCommand( |
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$commandClassName, |
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$this->handlers[$commandClassName], |
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$handler |
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); |
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} |
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// if callable is a string, then it should be a method name of the command handler |
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if (!is_callable($callable)) { |
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$callable = [$handler, $callable]; |
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} |
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$this->handlingMethods[$commandClassName] = $callable; |
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$this->handlers[$commandClassName] = $handler; |
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} |
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} |
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/** |
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* @return CommandHandlerInterface[] |
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*/ |
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public function getHandlers() |
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{ |
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return $this->handlers; |
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} |
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/** |
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* @param AbstractCommand $command |
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* |
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* @return callable[] |
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*/ |
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private function getHandlingMethodForCommand(AbstractCommand $command) |
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{ |
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return $this->filterForCommand($this->handlingMethods, $command); |
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} |
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/** |
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* @param AbstractCommand $command |
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* |
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* @return CommandHandlerInterface[] |
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*/ |
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private function getHandlerForCommand(AbstractCommand $command) |
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{ |
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return $this->filterForCommand($this->handlers, $command); |
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} |
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/** |
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* @param array $property |
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* @param AbstractCommand $command |
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* |
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* @return array |
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*/ |
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private function filterForCommand(array $property, AbstractCommand $command) |
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{ |
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$filtered = []; |
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foreach ($property as $commandClassName => $handler) { |
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if ($command instanceof $commandClassName) { |
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// After that, we still need to check if there is no other handler defined for this command. |
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// This is because we allow command handler to listen to parent class or interface. |
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$filtered[] = $handler; |
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} |
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} |
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return $filtered; |
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} |
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} |
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php-ddd /
domain-driven-design
