EnqueueHandler.php

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<?php

namespace Elgg\Email\DelayedQueue;

use Elgg\Notifications\Notification;

class EnqueueHandler {
    
    public function __invoke(\Elgg\Hook $hook): ?bool {
        if ($hook->getValue() === true) {
            // assume someone else already sent the message
            return null;
        }
        
        $notification = $hook->getParam('notification');
        if (!$notification instanceof Notification) {
            return false;
        }
        
        return _elgg_services()->delayedEmailService->enqueueNotification($notification);
    }
}