/// <summary>
/// Update the weighted moving average for the available results.
/// </summary>
/// <remarks>
/// Results are stored in <see cref="WeightedResult"/> if there are results to compute.
/// </remarks>
public void Update()
{
if (m_NumResults == 0)
{
return; // Nothing to do
}
// The specified weight is a percentage [0.0f..1.0f], so we'll
// use 100.0 as our "arbitrary" weighing value. Do not use a
// weight if there is only one result.
float currentResultWeight = ((m_NumResults == 1) ? 1.0f : m_Weight) * 100.0f;
// Give the current result the appropriate weight. We'll cast back to integer at the end.
QosStatsResult currentResult = m_Results[m_CurrentResult];
float weightedLatencyMs = currentResult.LatencyMs * (currentResultWeight / 100.0f);
float weightedPacketLoss = currentResult.PacketLoss * (currentResultWeight / 100.0f);
// Combine the remaining results and apply the remainder of the weight equally.
if (m_NumResults > 1)
{
float remainingWeightPerResult = (100.0f - currentResultWeight) / (m_NumResults - 1);
uint nextValidIndex = NextValidIndex(m_CurrentResult); // find the index of the next set of valid results.
for (int i = 0; i < m_NumResults - 1; ++i) // m_NumResults-1 so we don't include the currentResult again
{
QosStatsResult result = m_Results[(nextValidIndex + i) % m_MaxResults];
weightedLatencyMs += result.LatencyMs * (remainingWeightPerResult / 100.0f);
weightedPacketLoss += result.PacketLoss * (remainingWeightPerResult / 100.0f);
}
}
WeightedResult = new QosStatsResult(
Mathf.RoundToInt(weightedLatencyMs),
Mathf.Min(weightedPacketLoss, 1.0f)); // Make sure precision issues don't yield >100% packet loss
}
public WeightedMovingAverage(uint numResults, float weightOfCurrentResult)
{
m_MaxResults = numResults;
m_Weight = weightOfCurrentResult;
// Initial results are flagged as invalid until we have some results.
m_Results = new QosStatsResult[m_MaxResults];
for (int i = 0; i < m_MaxResults; ++i)
{
m_Results[i] = new QosStatsResult(-1, -1f);
}
WeightedResult = new QosStatsResult(-1, -1f);
}
public void AddResult(QosStatsResult result, bool updateAfterAdd = false)
{
if (m_NumResults < m_MaxResults)
{
++m_NumResults;
}
m_CurrentResult = (m_CurrentResult + 1) % m_NumResults;
m_Results[m_CurrentResult] = result;
if (updateAfterAdd)
{
Update();
}
}
/// <summary>
/// Get an array of all the results currently being tracked for the given key.
/// </summary>
/// <param name="ipAndPort">IP:Port string to get results for</param>
/// <param name="results">Array of results (unweighted) used to compute the weighted average.</param>
/// <returns>true if record(s) were found, false if key does not exist or no valid records found</returns>
/// <remarks>There is no way to determine which results correspond to the most recently added results.</remarks>
public bool TryGetAllResults(string ipAndPort, out QosStatsResult[] results)
{
m_ResultsLock.EnterReadLock();
try
{
if (!m_Results.TryGetValue(ipAndPort, out WeightedMovingAverage wma))
{
results = new QosStatsResult[0];
return(false);
}
wma.AllResults(out results);
return(results.Length > 0);
}
finally
{
m_ResultsLock.ExitReadLock();
}
}
/// <summary>
/// Get the weighted rolling average for the given key.
/// </summary>
/// <param name="ipAndPort">IP:Port string to get results for</param>
/// <param name="result">The weighted rolling average for the given ipAndPort</param>
/// <returns>true if the record was found, false otherwise</returns>
public bool TryGetWeightedAverage(string ipAndPort, out QosStatsResult result)
{
m_ResultsLock.EnterReadLock();
try
{
if (!m_Results.TryGetValue(ipAndPort, out WeightedMovingAverage wma))
{
result = new QosStatsResult(-1, -1f); // Make result invalid
return(false);
}
wma.Update();
result = wma.WeightedResult.IsValid() ? wma.WeightedResult : new QosStatsResult(-1, -1f);
return(result.IsValid());
}
finally
{
m_ResultsLock.ExitReadLock();
}
}
public void AllResults(out QosStatsResult[] results)
{
results = new QosStatsResult[m_Results.Length];
m_Results.CopyTo(results, 0);
}
