FutureUsers.scala

  def users(): Future[List[User]] = {
    val pl = Promise[List[User]]()
    Future {
      _roster.reloadAndWait()
      val entries = _roster.getEntries().asScala.toList
      val futures = entries map { entry =>
        val pu = Promise[User]()
        Future {  // wrap all this stuff in the future just so it doesn't block
          val target = entry.getUser()
          connection.sendIqWithResponseCallback(ProfileIQ(target), new StanzaListener() {
            def processPacket(packet: Stanza) = {
              if (packet != null && packet.isInstanceOf[ProfileIQ]) {
                val profile = Profile(packet.asInstanceOf[ProfileIQ])
                val user: User = User(
                  name     = entry.getName(),
                  jid      = entry.getUser(),
                  nick     = profile.mention_name,
                  entry    = entry
                )
                pu.success(user)
              } else {
                pu.failure(UserUseless("omg I have no idea"))
              }
            }
          })
        }
        pu.future // our return is a future of whatever results we get from the future above
      } 
      p1.success(Future.sequence(futures).flatten)
    }
    p1.future
  }

gistfile1.txt

Errors:
[error] /Users/vitocutten/playground/v2d2/src/main/scala/v2d2/RoboV2D2.scala:346: type mismatch;
[error]  found   : List[scala.concurrent.Future[Unit]]
[error]  required: List[v2d2.client.User]
[error]       pl.success(futures)
[error]                  ^
[error] one error found
[error] (compile:compileIncremental) Compilation failed
[error] Total time: 1 s, completed Mar 5, 2016 4:59:45 PM
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