// 重连逻辑， 留给上层重写实现
func (this *NetworkConnector) NetworkReconnect() {
f := func() {
zwflog.LogDebug("start to reconnect ...")
this.NetworkConnectTo(this.remoteAddr)
}
time.AfterFunc(reconnectDuration*time.Second, f)
}
func (this *Server) waitToExit() {
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt, os.Kill)
s := <-c // block until a signal is received
zwflog.LogDebug("server receive signal%d, and will exit!", s)
this.closeServer()
}