[GitHub] [incubator-livy] o-shevchenko commented on a change in pull request #220: [LIVY-654] Ability to validate string before creating state/kind of session/statement

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o-shevchenko commented on a change in pull request #220: [LIVY-654] Ability to validate string before creating state/kind of session/statement
URL: https://github.com/apache/incubator-livy/pull/220#discussion_r319828092
 
 

 ##########
 File path: core/src/main/scala/org/apache/livy/sessions/SessionState.scala
 ##########
 @@ -30,33 +30,33 @@ class FinishedSessionState(
 object SessionState {
 
   def apply(s: String): SessionState = s match {
-    case "not_started" => NotStarted
-    case "starting" => Starting
-    case "recovering" => Recovering
-    case "idle" => Idle
-    case "running" => Running
-    case "busy" => Busy
-    case "shutting_down" => ShuttingDown
+    case "not_started" => NotStarted()
+    case "starting" => Starting()
+    case "recovering" => Recovering()
+    case "idle" => Idle()
+    case "running" => Running()
+    case "busy" => Busy()
+    case "shutting_down" => ShuttingDown()
     case "error" => Error()
     case "dead" => Dead()
     case "killed" => Killed()
     case "success" => Success()
     case _ => throw new IllegalArgumentException(s"Illegal session state: $s")
   }
 
-  object NotStarted extends SessionState("not_started", true)
+  case class NotStarted() extends SessionState("not_started", true)
 
-  object Starting extends SessionState("starting", true)
+  case class Starting() extends SessionState("starting", true)
 
-  object Recovering extends SessionState("recovering", true)
+  case class Recovering() extends SessionState("recovering", true)
 
-  object Idle extends SessionState("idle", true)
+  case class Idle() extends SessionState("idle", true)
 
-  object Running extends SessionState("running", true)
+  case class Running() extends SessionState("running", true)
 
-  object Busy extends SessionState("busy", true)
+  case class Busy() extends SessionState("busy", true)
 
-  object ShuttingDown extends SessionState("shutting_down", false)
+  case class ShuttingDown() extends SessionState("shutting_down", false)
 
 Review comment:
   To unify access to enumeration type and to be able to create sequents of all states
   ```
   val states: Seq[SessionState] = Seq(NotStarted(), Starting(), Recovering(), Idle(), Running(),
       Busy(), ShuttingDown(), Killed(), Error(), Dead(), Success())
   ```

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