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<?php |
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namespace Joselfonseca\LaravelTactician; |
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use League\Tactician\CommandBus; |
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use League\Tactician\Exception\InvalidCommandException; |
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use League\Tactician\Exception\InvalidMiddlewareException; |
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use League\Tactician\Middleware; |
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/** |
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* Receives a command and sends it through a chain of middleware for processing. |
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* |
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* @final |
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*/ |
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class CommandBusUndoable extends CommandBus // Not really, but L for Liskov in SOLID Principles applies here too |
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{ |
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/** |
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* @var callable |
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*/ |
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private $middlewareUndoChain; |
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/** |
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* @var callable |
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*/ |
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private $middlewareRedoChain; |
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/** |
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* @param Middleware[] $middleware |
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*/ |
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public function __construct(array $middleware) |
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{ |
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$this->middlewareUndoChain = $this->createExecutionChain($middleware, 'executeUndo'); |
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$this->middlewareRedoChain = $this->createExecutionChain($middleware, 'executeRedo'); |
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} |
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/** |
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* Executes the given command and optionally returns a value |
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* |
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* @param object $command |
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* |
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* @return mixed |
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*/ |
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public function handlerUndo($command) |
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{ |
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if (is_object($command)) { |
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return $command; |
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} |
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if (!is_object($command)) { |
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throw InvalidCommandException::forUnknownValue($command); |
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} |
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return ($this->middlewareUndoChain)($command); |
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} |
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public function handlerRedo($command) |
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{ |
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if (is_object($command)) { |
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return $command; |
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} |
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if (!is_object($command)) { |
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throw InvalidCommandException::forUnknownValue($command); |
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} |
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return ($this->middlewareRedoChain)($command); |
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} |
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private function createExecutionChain($middlewareList, $executor) |
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{ |
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$lastCallable = function () { |
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// the final callable is a no-op |
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}; |
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while ($middleware = array_pop($middlewareList)) { |
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if (! $middleware instanceof Middleware) { |
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throw InvalidMiddlewareException::forMiddleware($middleware); |
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} |
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$lastCallable = function ($command) use ($middleware, $lastCallable, $executor) { |
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return $middleware->{$executor}($command, $lastCallable); |
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}; |
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} |
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return $lastCallable; |
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} |
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} |
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jagarsoft /
laravel-tactician
