如何检测g:include标记lib调用了控制器?

为了发送适当的响应,我需要 检测控制器操作是否已由经典HTTP GET请求、Ajax请求或 g:include 标签库 .

例如,考虑到以下代码片段:

class CommunityController {
  def show = {
    def users = getUsers()
    if (/* WHAT IS THE CODE HERE??? */)  //g:include request => render 'show' template only
      render template:'show', model=[users]
    else if (request.xhr)  //Ajax => we send JSON content
      render users as JSON
    else //Classic request => we render 'show' GSP page
      [users]
  }
}

…如何检测已通过g:include标记lib调用了操作?

谢谢您。