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<?php
declare(strict_types=1);
namespace League\Tactician;
use Closure;
use function array_pop;
/**
* Receives a command and sends it through a chain of middleware for processing.
*/
final class CommandBus
{
/** @var Closure(object $command):mixed */
private Closure $middlewareChain;
public function __construct(Middleware ...$middleware)
$this->middlewareChain = $this->createExecutionChain($middleware);
}
* Executes the given command and optionally returns a value
*
* @return mixed
public function handle(object $command)
return ($this->middlewareChain)($command);
* @param Middleware[] $middlewareList
private function createExecutionChain(array $middlewareList): Closure
$lastCallable = static fn () => null;
while ($middleware = array_pop($middlewareList)) {
$lastCallable = static fn (object $command) => $middleware->execute($command, $lastCallable);
return $lastCallable;
thephpleague /
tactician
