EventListener/AbstractConsumeEventListener.php
public function onConsume(ItemPipelineEvent $event)
    {
        if ($event->getItemSkip()) {
            $this->skip($event);
        } else {
            $this->consume($event);
        }
    }
public function onConsume(ItemPipelineEvent $event)
    {
        if ($event->getItemSkip()) {
            $this->skip($event);
        } else {
            $this->consume($event);
        }
    }
Entry point of consume event.

@param ItemPipelineEvent $event