trait CachedAttributesAwareEntityControllerTrait in Apigee Edge 8

trait CachedAttributesAwareEntityControllerTrait {
  use EntityCacheAwareControllerTrait;

  /**
   * The decorated entity controller from the SDK.
   *
   * We did not added a return type because this way all entity controller's
   * decorated() method becomes compatible with this declaration.
   *
   * @return \Apigee\Edge\Api\Management\Controller\AttributesAwareEntityControllerInterface
   *   An entity controller that extends this interface.
   */
  protected abstract function decorated();

  /**
   * {@inheritdoc}
   */
  public function getAttributes(string $entity_id) : AttributesProperty {
    $entity = $this
      ->entityCache()
      ->getEntity($entity_id);

    /** @var \Apigee\Edge\Entity\Property\AttributesPropertyInterface $entity */
    if ($entity) {
      return $entity
        ->getAttributes();
    }
    return $this
      ->decorated()
      ->getAttributes($entity_id);
  }

  /**
   * {@inheritdoc}
   */
  public function getAttribute(string $entity_id, string $name) : string {
    $entity = $this
      ->entityCache()
      ->getEntity($entity_id);

    /** @var \Apigee\Edge\Entity\Property\AttributesPropertyInterface $entity */
    if ($entity) {
      return $entity
        ->getAttributeValue($name);
    }
    return $this
      ->decorated()
      ->getAttribute($entity_id, $name);
  }

  /**
   * {@inheritdoc}
   */
  public function updateAttributes(string $entity_id, AttributesProperty $attributes) : AttributesProperty {
    $attributes = $this
      ->decorated()
      ->updateAttributes($entity_id, $attributes);

    // Enforce reload of entity from Apigee Edge.
    $this
      ->entityCache()
      ->removeEntities([
      $entity_id,
    ]);
    $this
      ->entityCache()
      ->allEntitiesInCache(FALSE);
    return $attributes;
  }

  /**
   * {@inheritdoc}
   */
  public function updateAttribute(string $entity_id, string $name, string $value) : string {
    $value = $this
      ->decorated()
      ->updateAttribute($entity_id, $name, $value);

    // Enforce reload of entity from Apigee Edge.
    $this
      ->entityCache()
      ->removeEntities([
      $entity_id,
    ]);
    $this
      ->entityCache()
      ->allEntitiesInCache(FALSE);
    return $value;
  }

  /**
   * {@inheritdoc}
   */
  public function deleteAttribute(string $entity_id, string $name) : void {
    $this
      ->decorated()
      ->deleteAttribute($entity_id, $name);

    // Enforce reload of entity from Apigee Edge.
    $this
      ->entityCache()
      ->removeEntities([
      $entity_id,
    ]);
    $this
      ->entityCache()
      ->allEntitiesInCache(FALSE);
  }

}