如何在游戏框架中的动作中获得被叫动作的响应

Question

i have two Actions in different controllers ActionA and ActionB i am calling ActionB in ActionA and i want to get its(ActionB) response in ActionA is it possible ? how can i achive this please help here is my code

class ControllerA extends Controller{

def ActionA = Action { implicit request =>
    var jsonRequest = request.body.asJson.get
    val uuid = (jsonRequest \ "uuid").as[String]
    log.info("in ActionA" + uuid)
    val controllerB= new ControllerB
    val actionB=controllerB.ActionB.apply(request)
    //here i want to get the response of ActionB and return this response as the response of ActionA whether its OK or InternelServerError
    Ok("i want to show the response of ActionB")
    }
}

class ControllerB extends Controller{
def ActionB = Action { implicit request =>
    var jsonRequest = request.body.asJson.get
    val uuid = (jsonRequest \ "uuid").as[String]
    log.info("in ActionB " + uuid)
    try {
      Ok("i am ActionB with id {}"+uuid)
    } catch {
      case e: Exception =>
        log.error("Exception ", e)
        val status = Http.Status.INTERNAL_SERVER_ERROR
        InternalServerError(Json.obj("status" -> status, "msg" -> ServerResponseMessages.INTERNAL_SERVER_ERROR))
    }
  }
}

please help

Answer 1

In play 2.2 and 2.3 controllers are typically an object instead of a class so I changed your controllers to be objects. In newer versions of play controllers are classes that are injected using the Guice framework.

Since invocations of actions is asynchronous, you need to change ActionA to be Action.async . Below are the changes that I made:

object ControllerA extends Controller{

  def ActionA = Action.async { implicit request =>
    var jsonRequest = request.body.asJson.get
    val uuid = (jsonRequest \ "uuid").as[String]
    log.info("in ActionA" + uuid)
    ControllerB.ActionB(request)
  }
}

object ControllerB extends Controller{
  def ActionB = Action { implicit request =>
    var jsonRequest = request.body.asJson.get
    val uuid = (jsonRequest \ "uuid").as[String]
    log.info("in ActionB " + uuid)
    try {
      Ok("i am ActionB with id {}"+uuid)
    } catch {
      case e: Exception =>
        log.error("Exception ", e)
        val status = Http.Status.INTERNAL_SERVER_ERROR
        InternalServerError(Json.obj("status" -> status, "msg" -> ServerResponseMessages.INTERNAL_SERVER_ERROR))
    }
  }
}

As the previous answer alluded to, it's far more advantageous to have shared controller code in a service layer that sits below your controllers as opposed to sharing controller code directly. Given your simplistic example though it seems OK to do what you're doing.

Answer 2

If you deploy your controllers in a single JVM, I think you can extract a function from ActionB and share the code between two controllers. If you deploy your controllers in two different JVMs, in this case you need to use a web service client library to query the endpoint. Just my two cents.