LeaveEvent example

$this->dispatcher->dispatch($event, sprintf('workflow.%s.guard', $this->name));
        $this->dispatcher->dispatch($event, sprintf('workflow.%s.guard.%s', $this->name, $transition->getName()));

        return $event;
    }

    private function leave(object $subject, Transition $transition, Marking $marking, array $context = []): void
    {
        $places = $transition->getFroms();

        if ($this->shouldDispatchEvent(WorkflowEvents::LEAVE, $context)) {
            $event = new LeaveEvent($subject, $marking, $transition, $this, $context);

            $this->dispatcher->dispatch($event, WorkflowEvents::LEAVE);
            $this->dispatcher->dispatch($event, sprintf('workflow.%s.leave', $this->name));

            foreach ($places as $place) {
                $this->dispatcher->dispatch($event, sprintf('workflow.%s.leave.%s', $this->name, $place));
            }
        }

        foreach ($places as $place) {
            $marking->unmark($place);
        }