xql refactoring

提交任务

AdminHandler

+ receive: Receive

ServerStateStorage

AdminService

+ startEngine(engineId: Int): Future[Boolean]+ stopEngine(engineId: Int): Future[Boolean]+ replaceEngine(engineConfig: XQLEngineConf): Future[Boolean]+ serverState: Future[XQLServerState]

根据策略，返回一个可用连接

 请求一个远程连接

JobService

发回结果

RemoteRef

- id: Int- ref: ActorRef

QueryStorage

JobHandler

ComputeMasterActor

初始化注册