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<?php
declare(strict_types=1);
namespace Werkspot\MessageBus\Bus\DeliveryChain\Middleware;
use Exception;
use Werkspot\MessageBus\Bus\DeliveryChain\MiddlewareInterface;
use Werkspot\MessageBus\Message\MessageInterface;
/**
* This middleware isolates the execution of subsequent commands
* so we that they don't interfere on the execution of the
* current command
*/
final class LockingMiddleware implements MiddlewareInterface
{
* @var bool
private $executing = false;
* @var callable[]
private $queue = [];
public function deliver(MessageInterface $message, callable $next): void
$this->enqueue($message, $next);
if ($this->executing) {
return;
}
try {
$this->executing = true;
$this->processQueue();
} catch (Exception $e) {
$this->queue = [];
throw $e;
} finally {
$this->executing = false;
* Queues the execution of the next message instead of executing it
* when it's added to the message bus
private function enqueue(MessageInterface $message, callable $next): void
$this->queue[] = function () use ($message, $next): void {
$next($message);
};
* Process one message at time so we can isolate their execution
private function processQueue(): void
while ($resumeMessage = array_shift($this->queue)) {
$resumeMessage();
Werkspot /
message-bus
