Github user manuzhang commented on a diff in the pull request:

    https://github.com/apache/incubator-gearpump/pull/134#discussion_r97273193
  
    --- Diff: 
core/src/main/scala/org/apache/gearpump/cluster/client/RunningApplication.scala 
---
    @@ -18,17 +18,21 @@
     package org.apache.gearpump.cluster.client
     
     import akka.pattern.ask
    -import akka.actor.ActorRef
    +import akka.actor.{Actor, ActorRef, ActorSystem, Props}
     import akka.util.Timeout
    -import org.apache.gearpump.cluster.ClientToMaster.{ResolveAppId, 
ShutdownApplication}
    -import org.apache.gearpump.cluster.MasterToClient.{ResolveAppIdResult, 
ShutdownApplicationResult}
    +import 
org.apache.gearpump.cluster.ClientToMaster.{RegisterAppResultListener, 
ResolveAppId, ShutdownApplication}
    +import org.apache.gearpump.cluster.MasterToClient._
    +import 
org.apache.gearpump.cluster.client.RunningApplication.{AppResultListener, 
WaitUntilFinish}
     import org.apache.gearpump.util.ActorUtil
    +import org.apache.gearpump.cluster.client.RunningApplication._
     
    +import scala.concurrent.duration._
     import scala.concurrent.Future
     import scala.util.{Failure, Success}
     import scala.concurrent.ExecutionContext.Implicits.global
     
    -class RunningApplication(val appId: Int, master: ActorRef, timeout: 
Timeout) {
    +class RunningApplication(val appId: Int, master: ActorRef, timeout: 
Timeout,
    --- End diff --
    
    I think we need a user interface here. `RunningApplication` could be the 
default implementation. Plus, please add guide on how to use the interface. 


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