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<?php
/**
* This file is part of Railt package.
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
declare(strict_types=1);
namespace Railt\SDL\Runtime;
* Trait Observer
* @mixin Observable
trait Observer
{
* @var array|\Closure[]
private $observers = [];
* @param \Closure $observer
* @param bool $prepend
* @return Observable
public function subscribe(\Closure $observer, bool $prepend = false): Observable
if ($prepend) {
\array_unshift($this->observers, $observer);
} else {
$this->observers[] = $observer;
}
return $this;
* @param mixed $payload
* @param bool $overwrite
* @return mixed
protected function notify($payload, bool $overwrite = false)
foreach ($this->observers as $observer) {
if ($overwrite && ($data = $observer($payload)) !== null) {
$payload = $data;
return $payload;
railt /
sdl
