public synchronized boolean getSnapshot()

in metrics/src/main/java/com/facebook/battery/metrics/disk/DiskMetricsCollector.java [40:99]

48 lines of code
9 McCabe index (conditional complexity)


  public synchronized boolean getSnapshot(DiskMetrics snapshot) {
    checkNotNull(snapshot, "Null value passed to getSnapshot!");
    if (!mIsEnabled) {
      return false;
    }

    try {
      ProcFileReader ioReader = mProcIoFileReader.get();
      if (ioReader == null) {
        ioReader = new ProcFileReader(getIoFilePath());
        mProcIoFileReader.set(ioReader);
      }

      ioReader.reset();

      if (!ioReader.isValid()) {
        return false;
      }

      snapshot.rcharBytes = readField(ioReader);
      snapshot.wcharBytes = readField(ioReader);
      snapshot.syscrCount = readField(ioReader);
      snapshot.syscwCount = readField(ioReader);
      snapshot.readBytes = readField(ioReader);
      snapshot.writeBytes = readField(ioReader);
      snapshot.cancelledWriteBytes = readField(ioReader);

      ProcFileReader statReader = mProcStatFileReader.get();
      if (statReader == null) {
        statReader = new ProcFileReader(getStatFilePath());
        mProcStatFileReader.set(statReader);
      }

      statReader.reset();

      if (!statReader.isValid()) {
        return false;
      }

      int index = 0;
      while (index < PROC_STAT_MAJOR_FAULTS_FIELD) {
        statReader.skipSpaces();
        index++;
      }

      snapshot.majorFaults = statReader.readNumber();

      while (index < PROC_STAT_BLKIO_TICKS_FIELD) {
        statReader.skipSpaces();
        index++;
      }

      snapshot.blkIoTicks = statReader.readNumber();
    } catch (ProcFileReader.ParseException pe) {
      SystemMetricsLogger.wtf(TAG, "Unable to parse disk field", pe);
      return false;
    }

    return true;
  }