Callback using a random port done :D

"-features" in build.sbt and scalacOptions
Thread now is launched ans runs the callback RMI server

Author: Yawolf

build.sbt

@@ -15,6 +15,7 @@ lazy val root = (project in file(".")).
   settings(
     // set the name of the project
     name := "Client",
+	scalacOptions += "-feature",
     scalaSource in Compile := baseDirectory.value / "src",
 
     mainClass in (Compile, run) := Some("client.Client")

src/client/Client.scala

@@ -6,6 +6,7 @@ import java.util.Calendar
 import scala.annotation.tailrec
 import scala.language.postfixOps
 import java.rmi.server.UnicastRemoteObject
+import scala.util.Random
 
 sealed abstract class State
 object State {
@@ -34,13 +35,8 @@ object Client {
       val ret = stub login(user,pass)
       if (ret) {
         println("Welcome back! :D")
-        // val callback: ClientTrait = new ClientTraitImpl(user)
-        // stub registerForCallback(user,callback)
-        new Thread(new Runnable {
-          def run() {
-            ClientTraitImpl.main(user)
-          }
-        })
+        val port = getRandomPort
+        createCallback(user,port)
         stub justRegisterMe(user)
         (MainState,user)
       }
@@ -51,6 +47,20 @@ object Client {
     }
   }
 
+  def getRandomPort: Int = {
+    val r = new Random
+    r.nextInt(65535-6969) + 6969
+  }
+
+  def createCallback(user: String, port: Int): Unit = {
+    val cb = new Thread(new Runnable {
+          def run() {
+            ClientTraitImpl.main(user,port)
+          }
+    })
+    cb.start
+  }
+
   def createUserCli(stub: server.ServerTrait): (State,String) = {
     val user = readLine("User: ")
     val pass = readLine("Password: ")

src/client/ClientTraitImpl.scala

@@ -3,6 +3,7 @@ package client
 import java.rmi.server.UnicastRemoteObject
 import java.rmi.registry.Registry
 import java.rmi.registry.LocateRegistry
+import scala.language.postfixOps
 
 class ClientTraitImpl extends ClientTrait {
 
@@ -12,11 +13,12 @@ class ClientTraitImpl extends ClientTrait {
 }
 
 object ClientTraitImpl {
-  def main(name: String): Unit = {
+  def main(name: String, port: Int): Unit = {
     try {
       val cb: ClientTrait = new ClientTraitImpl
       val stub = UnicastRemoteObject.exportObject(cb,0).asInstanceOf[ClientTrait]
-      val registry = LocateRegistry.createRegistry(1099)
+      val port = getRandomPort
+      val registry = LocateRegistry.createRegistry(port)
       registry.rebind(name, stub)
     } catch {
       case e: Exception => e printStackTrace