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<?php |
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namespace League\Tactician\Handler; |
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use League\Tactician\Middleware; |
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use League\Tactician\Exception\CanNotInvokeHandlerException; |
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use League\Tactician\Handler\CommandNameExtractor\CommandNameExtractor; |
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use League\Tactician\Handler\Locator\HandlerLocator; |
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use League\Tactician\Handler\MethodNameInflector\MethodNameInflector; |
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/** |
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* The "core" CommandBus. Locates the appropriate handler and executes command. |
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*/ |
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class CommandHandlerMiddleware implements Middleware |
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{ |
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/** |
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* @var CommandNameExtractor |
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*/ |
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private $commandNameExtractor; |
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/** |
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* @var HandlerLocator |
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*/ |
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private $handlerLocator; |
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/** |
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* @var MethodNameInflector |
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*/ |
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private $methodNameInflector; |
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/** |
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* @param CommandNameExtractor $commandNameExtractor |
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* @param HandlerLocator $handlerLocator |
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* @param MethodNameInflector $methodNameInflector |
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*/ |
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public function __construct( |
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CommandNameExtractor $commandNameExtractor, |
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HandlerLocator $handlerLocator, |
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MethodNameInflector $methodNameInflector |
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) { |
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$this->commandNameExtractor = $commandNameExtractor; |
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$this->handlerLocator = $handlerLocator; |
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$this->methodNameInflector = $methodNameInflector; |
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} |
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/** |
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* Executes a command and optionally returns a value |
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* |
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* @param object $command |
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* @param callable $next |
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* |
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* @return mixed |
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* |
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* @throws CanNotInvokeHandlerException |
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*/ |
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public function execute($command, callable $next) |
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{ |
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$commandName = $this->commandNameExtractor->extract($command); |
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$handler = $this->handlerLocator->getHandlerForCommand($commandName); |
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$methodName = $this->methodNameInflector->inflect($command, $handler); |
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// is_callable is used here instead of method_exists, as method_exists |
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// will fail when given a handler that relies on __call. |
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if (!is_callable([$handler, $methodName])) { |
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throw CanNotInvokeHandlerException::forCommand( |
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$command, |
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"Method '{$methodName}' does not exist on handler" |
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); |
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} |
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return $handler->{$methodName}($command); |
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} |
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} |
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Adgoal /
tactician
