/**
* Indicate that an elapsed time sample should be taken. The sample is the time that has passed
* since the last start() call with the name timer name (the argument key). It is an error to
* call stop if there has been no corresponding call to start.
*
* @param key The name of the timer with which to record the new elapsed time sample.
* @param dataAmount The amount of data transfered during this interval.
* @return The length of the measured interval, in msec.
*/
public static double stop(String key, long dataAmount) {
if (key == null) throw new RuntimeException("ElapsedTime key can't be null");
TransferRateInterval entry = mSampleSetManager.get(key);
if (entry == null || entry.mStartTime < 0)
throw new RuntimeException("stop(" + key + ") called but there was no matching start");
double timeSample = (System.nanoTime() - entry.mStartTime) * MSEC_SCALE;
entry.mStartTime = -1;
entry.addSample(timeSample, dataAmount);
return timeSample > 0.0 ? dataAmount / timeSample : Double.MAX_VALUE;
}
