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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Messenger;
use Symfony\Component\Messenger\Exception\LogicException;
use Symfony\Component\Messenger\Stamp\HandledStamp;
/**
* Leverages a message bus to expect a single, synchronous message handling and return its result.
*
* @author Maxime Steinhausser <maxime.steinhausser@gmail.com>
*/
trait HandleTrait
{
private MessageBusInterface $messageBus;
/**
* Dispatches the given message, expecting to be handled by a single handler
* and returns the result from the handler returned value.
* This behavior is useful for both synchronous command & query buses,
* the last one usually returning the handler result.
*
* @param object|Envelope $message The message or the message pre-wrapped in an envelope
*/
private function handle(object $message): mixed
{
if (!isset($this->messageBus)) {
throw new LogicException(sprintf('You must provide a "%s" instance in the "%s::$messageBus" property, but that property has not been initialized yet.', MessageBusInterface::class, static::class));
}
$envelope = $this->messageBus->dispatch($message);
/** @var HandledStamp[] $handledStamps */
$handledStamps = $envelope->all(HandledStamp::class);
if (!$handledStamps) {
throw new LogicException(sprintf('Message of type "%s" was handled zero times. Exactly one handler is expected when using "%s::%s()".', get_debug_type($envelope->getMessage()), static::class, __FUNCTION__));
}
if (\count($handledStamps) > 1) {
$handlers = implode(', ', array_map(fn (HandledStamp $stamp): string => sprintf('"%s"', $stamp->getHandlerName()), $handledStamps));
throw new LogicException(sprintf('Message of type "%s" was handled multiple times. Only one handler is expected when using "%s::%s()", got %d: %s.', get_debug_type($envelope->getMessage()), static::class, __FUNCTION__, \count($handledStamps), $handlers));
}
return $handledStamps[0]->getResult();
}
}