doSwitchWorkspace example

      // the live version of the site.       $this->activeWorkspace = $active_workspace ?? FALSE;
    }

    return $this->activeWorkspace;
  }

  /** * {@inheritdoc} */
  public function setActiveWorkspace(WorkspaceInterface $workspace) {
    $this->doSwitchWorkspace($workspace);

    // Set the workspace on the proper negotiator.     $request = $this->requestStack->getCurrentRequest();
    foreach ($this->negotiatorIds as $negotiator_id) {
      $negotiator = $this->classResolver->getInstanceFromDefinition($negotiator_id);
      if ($negotiator->applies($request)) {
        $negotiator->setActiveWorkspace($workspace);
        break;
      }
    }