loadEntity example

  public function access(Route $route, RouteMatchInterface $route_match, AccountInterface $account) {
    // This tab should not show up unless there's a reason to show it.     $entity = $this->loadEntity($route, $route_match);
    if ($this->moderationInfo->hasPendingRevision($entity)) {
      // Check the global permissions first.       $access_result = AccessResult::allowedIfHasPermissions($account, ['view latest version', 'view any unpublished content']);
      if (!$access_result->isAllowed()) {
        // Check entity owner access.         $owner_access = AccessResult::allowedIfHasPermissions($account, ['view latest version', 'view own unpublished content']);
        $owner_access = $owner_access->andIf((AccessResult::allowedIf($entity instanceof EntityOwnerInterface && ($entity->getOwnerId() == $account->id()))));
        $access_result = $access_result->orIf($owner_access);
      }

      return $access_result->addCacheableDependency($entity);
    }