Event Subscriber Instead of Hooks

drupal_hook_events.info.yml

name: 'Drupal hook events'
description: 'Events Subscriber instead of hooks'
type: module
core: 8.x
dependencies:
  - 'drupal:hook_event_dispatcher' 

drupal_hook_events.services.yml

services:
  preprocess.hook_entity_view:
    class: 'Drupal\drupal_hook_events\EventSubscriber\EntityViewSubScriber'
    tags:
      - { name: 'event_subscriber' }

drupal_hook_events/src/EventSubscriber/EntityViewSubScriber.php

<?php

namespace Drupal\drupal_hook_events\EventSubscriber;

use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Drupal\hook_event_dispatcher\HookEventDispatcherInterface;

/**
 * Class EntityViewModeAlterEventSubScriber.
 */
class EntityViewSubScriber implements EventSubscriberInterface {

  /**
   * {@inheritdoc}
   */
  public static function getSubscribedEvents() {
    return [
      HookEventDispatcherInterface::ENTITY_VIEW => 'entityViewCallback',
    ];
  }

  /**
   * Preprocessing the our logic
   */
  public function entityViewCallback($event) {
    // Here we can write our things which we do in hook_entity_view().
  }

}