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<?php |
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/** |
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* (c) 2018 Douglas Reith. |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace Reith\ToyRobot\Infrastructure\Bus; |
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use Psr\Log\LoggerInterface; |
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use Assert\Assertion; |
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use Reith\ToyRobot\Messaging\BusInterface; |
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abstract class AbstractBus implements BusInterface |
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{ |
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// Message handlers |
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private $handlers; |
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private $logger; |
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/** |
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* @param LoggerInterface|null $logger |
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*/ |
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public function __construct(?LoggerInterface $logger = null) |
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{ |
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$this->logger = $logger; |
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} |
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/** |
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* @param mixed $handler |
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*/ |
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public function registerHandler($handler): AbstractBus |
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{ |
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// Expect the handler to be an object |
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Assertion::isObject($handler); |
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$this->handlers[] = new HandlerWrapper($handler); |
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return $this; |
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} |
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/** |
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* @param mixed $message |
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* |
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* @throws \Assert\AssertionFailedException |
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*/ |
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public function post($message, ?callable $callback = null): void |
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{ |
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// Expect the message to be an object to use reflection |
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// and match the handler method |
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Assertion::isObject($message); |
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$messageHandler = $this->findHandler($message); |
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$this->log( |
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sprintf( |
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'Sending message [%s] to handler [%s::%s()]', |
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get_class($message), |
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get_class($messageHandler[0]), |
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$messageHandler[1] |
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) |
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); |
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// Run the command |
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$result = call_user_func($messageHandler, $message); |
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if ($callback) { |
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call_user_func($callback, $result); |
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} |
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} |
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/** |
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* @param string $msg |
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*/ |
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private function log(string $msg): void |
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{ |
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if (!$this->logger) { |
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return; |
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} |
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$this->logger->info($msg); |
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} |
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/** |
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* @return callable |
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* |
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* @throws \RuntimeException |
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*/ |
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private function findHandler($message): callable |
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{ |
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// In this implementation the first handler wins but |
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// actually we would want to fail if there is more than |
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// one for Commands and Queries |
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foreach ($this->handlers as $handler) { |
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if ($callable = $handler->getCallable($message)) { |
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return $callable; |
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} |
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} |
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throw new \RuntimeException( |
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sprintf('No handler was found for message [%s]', get_class($message)) |
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); |
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} |
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} |
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reithbot /
toyrobot-php
