/// <summary>Calculates the top N users over a time interval.</summary>
/// <param name="time">the current time</param>
/// <param name="metricName">Name of metric</param>
/// <returns/>
private RollingWindowManager.TopN GetTopUsersForMetric(long time, string metricName
, RollingWindowManager.RollingWindowMap rollingWindows)
{
RollingWindowManager.TopN topN = new RollingWindowManager.TopN(topUsersCnt);
IEnumerator <KeyValuePair <string, RollingWindow> > iterator = rollingWindows.GetEnumerator
();
while (iterator.HasNext())
{
KeyValuePair <string, RollingWindow> entry = iterator.Next();
string userName = entry.Key;
RollingWindow aWindow = entry.Value;
long windowSum = aWindow.GetSum(time);
// do the gc here
if (windowSum == 0)
{
Log.Debug("gc window of metric: {} userName: {}", metricName, userName);
iterator.Remove();
continue;
}
Log.Debug("offer window of metric: {} userName: {} sum: {}", metricName, userName
, windowSum);
topN.Offer(new RollingWindowManager.NameValuePair(userName, windowSum));
}
Log.Info("topN size for command {} is: {}", metricName, topN.Count);
return(topN);
}
/// <summary>Get the rolling window specified by metric and user.</summary>
/// <param name="metric">the updated metric</param>
/// <param name="user">the user that updated the metric</param>
/// <returns>the rolling window</returns>
private RollingWindow GetRollingWindow(string metric, string user)
{
RollingWindowManager.RollingWindowMap rwMap = metricMap[metric];
if (rwMap == null)
{
rwMap = new RollingWindowManager.RollingWindowMap();
RollingWindowManager.RollingWindowMap prevRwMap = metricMap.PutIfAbsent(metric, rwMap
);
if (prevRwMap != null)
{
rwMap = prevRwMap;
}
}
RollingWindow window = rwMap[user];
if (window != null)
{
return(window);
}
window = new RollingWindow(windowLenMs, bucketsPerWindow);
RollingWindow prevWindow = rwMap.PutIfAbsent(user, window);
if (prevWindow != null)
{
window = prevWindow;
}
return(window);
}
/// <summary>Take a snapshot of current top users in the past period.</summary>
/// <param name="time">the current time</param>
/// <returns>
/// a TopWindow describing the top users for each metric in the
/// window.
/// </returns>
public virtual RollingWindowManager.TopWindow Snapshot(long time)
{
RollingWindowManager.TopWindow window = new RollingWindowManager.TopWindow(windowLenMs
);
if (Log.IsDebugEnabled())
{
ICollection <string> metricNames = metricMap.Keys;
Log.Debug("iterating in reported metrics, size={} values={}", metricNames.Count,
metricNames);
}
foreach (KeyValuePair <string, RollingWindowManager.RollingWindowMap> entry in metricMap)
{
string metricName = entry.Key;
RollingWindowManager.RollingWindowMap rollingWindows = entry.Value;
RollingWindowManager.TopN topN = GetTopUsersForMetric(time, metricName, rollingWindows
);
int size = topN.Count;
if (size == 0)
{
continue;
}
RollingWindowManager.OP op = new RollingWindowManager.OP(metricName, topN.GetTotal
());
window.AddOp(op);
// Reverse the users from the TopUsers using a stack,
// since we'd like them sorted in descending rather than ascending order
Stack <RollingWindowManager.NameValuePair> reverse = new Stack <RollingWindowManager.NameValuePair
>();
for (int i = 0; i < size; i++)
{
reverse.Push(topN.Poll());
}
for (int i_1 = 0; i_1 < size; i_1++)
{
RollingWindowManager.NameValuePair userEntry = reverse.Pop();
RollingWindowManager.User user = new RollingWindowManager.User(userEntry.name, Sharpen.Extensions.ValueOf
(userEntry.value));
op.AddUser(user);
}
}
return(window);
}