file logger com.codahale.metrics fix akka

fileReporter

// cancel sheduler and cloase file as one cancelable  
private def fileLogger(): Cancellable with Object {def cancel(): Boolean; def isCancelled: Boolean} = {

    val w = new BufferedWriter(new FileWriter(
      s"../metrics_${TcpUtil.firstPartFromIp}_${numberOfClients}_${LocalTime.now()}.dat"))
    val scheduled = context.system.scheduler.schedule(Config.STAT_PROBE_DURATION, Config.STAT_PROBE_DURATION) {
      w.write( LineLog.toFileString(LocalTime.now(),
        beats.getCount, fails.getCount, closings.getCount, receives.getCount, reconnects.getCount)+"\n")
      w.flush()
    }
    // binding two bounded resources to be released at once
    new Cancellable {
      @deprecated override def isCancelled: Boolean = scheduled.isCancelled

      override def cancel(): Boolean = {
        scheduled.cancel()
        w.close() // should wait for canceling schedule?
        true
      }
    }

  }