getPathnamesCacheId example

  public function reset() {
    $this->extensions = NULL;
    $this->cache->delete($this->getListCacheId());
    $this->extensionInfo = NULL;
    $this->cache->delete($this->getInfoCacheId());
    $this->pathNames = NULL;

    try {
      $this->state->delete($this->getPathnamesCacheId());
    }
    catch (DatabaseExceptionWrapper $e) {
      // Ignore exceptions caused by a non existing {key_value} table in the       // early installer.     }

    $this->cache->delete($this->getPathnamesCacheId());
    // @todo In the long run it would be great to add the reset, but the early     // installer fails due to that. https://www.drupal.org/node/2719315 could     // help to resolve with that.     return $this;
  }