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<?php |
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namespace Joselfonseca\LaravelTactician; |
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use ReflectionClass; |
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use InvalidArgumentException; |
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use League\Tactician\CommandBus; |
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use League\Tactician\Plugins\LockingMiddleware; |
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use League\Tactician\Handler\CommandHandlerMiddleware; |
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use Joselfonseca\LaravelTactician\Locator\LocatorInterface; |
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use League\Tactician\Handler\MethodNameInflector\MethodNameInflector; |
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use League\Tactician\Handler\CommandNameExtractor\CommandNameExtractor; |
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/** |
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* The default Command bus Using Tactician, this is an implementation to dispatch commands to their handlers trough a middleware stack, every class is resolved from the laravel's service container. |
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* |
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* @package Joselfonseca\LaravelTactician |
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*/ |
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class Bus implements CommandBusInterface |
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{ |
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/** |
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* @var CommandBus |
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*/ |
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protected $bus; |
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/** |
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* @var CommandNameExtractor |
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*/ |
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protected $CommandNameExtractor; |
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/** |
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* @var MethodNameInflector |
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*/ |
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protected $MethodNameInflector; |
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/** |
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* @var LocatorInterface |
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*/ |
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protected $HandlerLocator; |
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/** |
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* @param MethodNameInflector $MethodNameInflector |
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* @param CommandNameExtractor $CommandNameExtractor |
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* @param LocatorInterface $HandlerLocator |
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*/ |
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public function __construct( |
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MethodNameInflector $MethodNameInflector, |
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CommandNameExtractor $CommandNameExtractor, |
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LocatorInterface $HandlerLocator |
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) { |
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$this->MethodNameInflector = $MethodNameInflector; |
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$this->CommandNameExtractor = $CommandNameExtractor; |
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$this->HandlerLocator = $HandlerLocator; |
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} |
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/** |
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* Dispatch a command |
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* |
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* @param object $command Command to be dispatched |
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* @param array $input Array of input to map to the command |
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* @param array $middleware Array of middleware class name to add to the stack, they are resolved from the laravel container |
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* @return mixed |
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*/ |
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public function dispatch($command, array $input = [], array $middleware = []) |
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{ |
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return $this->handleTheCommand($command, $input, $middleware); |
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} |
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/** |
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* Add the Command Handler |
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* |
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* @param string $command Class name of the command |
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* @param string $handler Class name of the handler to be resolved from the Laravel Container |
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* @return mixed |
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*/ |
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public function addHandler($command, $handler) |
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{ |
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$this->HandlerLocator->addHandler($handler, $command); |
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} |
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/** |
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* Handle the command |
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* |
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* @param $command |
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* @param $input |
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* @param $middleware |
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* @return mixed |
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*/ |
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protected function handleTheCommand($command, $input, array $middleware) |
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{ |
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$this->bus = new CommandBus( |
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array_merge( |
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[new LockingMiddleware()], |
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$this->resolveMiddleware($middleware), |
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[new CommandHandlerMiddleware($this->CommandNameExtractor, $this->HandlerLocator, $this->MethodNameInflector)] |
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) |
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); |
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return $this->bus->handle($this->mapInputToCommand($command, $input)); |
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} |
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/** |
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* Resolve the middleware stack from the laravel container |
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* |
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* @param $middleware |
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* @return array |
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*/ |
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protected function resolveMiddleware(array $middleware) |
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{ |
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$m = []; |
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foreach ($middleware as $class) { |
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$m[] = app($class); |
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} |
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return $m; |
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} |
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/** |
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* Map the input to the command |
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* |
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* @param $command |
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* @param $input |
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* @return object |
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*/ |
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protected function mapInputToCommand($command, $input) |
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{ |
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if (is_object($command)) { |
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return $command; |
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} |
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$dependencies = []; |
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$class = new ReflectionClass($command); |
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foreach ($class->getConstructor()->getParameters() as $parameter) { |
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if ( $parameter->getPosition() == 0 && $parameter->isArray() ) { |
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if ($input !== []) { |
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$dependencies[] = $input; |
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} else { |
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$dependencies[] = $this->getDefaultValueOrFail($parameter); |
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} |
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} else { |
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$name = $parameter->getName(); |
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if (array_key_exists($name, $input)) { |
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$dependencies[] = $input[$name]; |
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} else { |
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$dependencies[] = $this->getDefaultValueOrFail($parameter); |
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} |
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} |
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} |
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return $class->newInstanceArgs($dependencies); |
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} |
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/** |
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* Returns Default Value for parameter if it exists Or Fail |
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* |
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* @ReflectionParameter $parameter |
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* @return mixed |
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*/ |
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private function getDefaultValueOrFail($parameter) |
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{ |
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if (! $parameter->isDefaultValueAvailable()) { |
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throw new InvalidArgumentException("Unable to map input to command: {$parameter->getName()}"); |
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} |
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return $parameter->getDefaultValue(); |
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} |
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} |
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joselfonseca /
laravel-tactician
