/// <summary>
/// Renders RulerIntervals to the sequence of marks ready to be painted on the screen
/// </summary>
public static IEnumerable <TimeRulerMark> GenerateTimeRulerMarks(TimeRulerIntervals intervals, DateRange range)
{
RulerIntervalInternal major = new RulerIntervalInternal(intervals.Major);
RulerIntervalInternal minor = new RulerIntervalInternal(intervals.Minor);
DateTime lastMajor = DateTime.MaxValue;
for (DateTime d = major.StickToIntervalBounds(range.Begin);
d < range.End; d = minor.MoveDate(d))
{
if (d < range.Begin)
{
continue;
}
if (!major.IsHiddenWhenMajor)
{
DateTime tmp = major.StickToIntervalBounds(d);
if (tmp >= range.Begin && tmp != lastMajor)
{
yield return(new TimeRulerMark(tmp, true, major.Component));
lastMajor = tmp;
if (tmp == d)
{
continue;
}
}
yield return(new TimeRulerMark(d, false, minor.Component));
}
else
{
yield return(new TimeRulerMark(d, true, minor.Component));
}
}
}
async Task <ResultCode> FindGaps(DateRange range, TimeSpan threshold, int?maxGapsCount, List <TimeGap> ret)
{
using (trace.NewFrame)
{
trace.Info("threshold={0}", threshold.ToString());
if (threshold.Ticks == 0)
{
trace.Warning("threshold is empty");
return(ResultCode.None);
}
ResultCode resultCode = ResultCode.None;
Helper helper = new Helper(this);
// Below is the actual algorithm of finding the gaps:
// - we start from the begin of the range (d = range.Begin).
// On the first iteration we find the positions of the messages
// that have the date less than d.
// - on the next iterations we are finding out if there are messages
// with the date less than (d + threshold) with position different from
// the current positions. If yes, then there is no gap on
// interval (d, d + threshold).
// - If no messages are found on the interval then we encountered with
// a time gap. The end of the gap is located by searching for the
// first message that is greated than d.
TimeSpan cumulativeGapsLen = new TimeSpan();
for (DateTime d = range.Begin; d < range.End;)
{
trace.Info("moving to the lower bound of {0}", d);
if (IsStopOrInvalidate(resultCode = await helper.MoveToDateBound(d, reversedMode: true)))
{
return(resultCode);
}
if (resultCode == ResultCode.Ok)
{
trace.Info("moved successfully. The lower bound is {0}.", helper.CurrentDate);
d = helper.CurrentDate.Advance(threshold).ToLocalDateTime();
}
else
{
var gapBegin = helper.CurrentDate.ToLocalDateTime();
// A tick is needed here becuase CurrentDate is a date of an existing message.
// The gap begins right after this date. This tick matters when
// we are comparing gap's date range with a date range of messages.
// Do not forget: date ranges use the idea that DateRange.End doesn't belong
// to the range.
gapBegin = gapBegin.AddTicks(1);
trace.Info("no readers advanced. It's time gap starting at {0}", gapBegin);
trace.Info("moving to the date greater than {0}", d);
if (IsStopOrInvalidate(resultCode = await helper.MoveToDateBound(d, reversedMode: false)))
{
return(resultCode);
}
DateTime gapEnd = helper.CurrentDate.ToLocalDateTime();
trace.Info("the end of the gap: {0}", gapEnd);
if (MessageTimestamp.Compare(helper.CurrentDate, MessageTimestamp.MaxValue) != 0)
{
d = helper.CurrentDate.Advance(threshold).ToLocalDateTime();
}
else
{
d = DateTime.MaxValue;
}
var gap = new TimeGap(new DateRange(gapBegin, gapEnd));
trace.Info("creating new gap {0}", gap);
ret.Add(gap);
if (maxGapsCount.HasValue && ret.Count > maxGapsCount.Value)
{
throw new TooManyGapsException();
}
cumulativeGapsLen += gap.Range.Length;
}
}
trace.Info("returning {0} gaps", ret.Count);
return(ResultCode.None);
}
}
public TimeGap(DateRange r)
{
this.range = r;
}
public LifetimeBar(DateRange lifetime, string label)
{
Lifetime = lifetime;
Label = label;
}
async Task <bool> UpdateAvailableTime(bool incrementalMode)
{
bool itIsFirstUpdate = firstUpdateFlag;
firstUpdateFlag = false;
UpdateBoundsStatus status = reader.UpdateAvailableBounds(incrementalMode);
if (status == UpdateBoundsStatus.NothingUpdated && incrementalMode)
{
return(false);
}
if (status == UpdateBoundsStatus.OldMessagesAreInvalid)
{
incrementalMode = false;
}
// Get new boundary values into temporary variables
IMessage newFirst, newLast;
PositionedMessagesUtils.GetBoundaryMessages(reader, null, out newFirst, out newLast);
if (firstMessage != null)
{
if (newFirst == null || MessageTimestamp.Compare(newFirst.Time, firstMessage.Time) != 0)
{
// The first message we've just read differs from the cached one.
// This means that the log was overwritten. Fall to non-incremental mode.
incrementalMode = false;
}
}
if (!incrementalMode)
{
if (!itIsFirstUpdate)
{
// Reset everything that has been loaded so far
await InvalidateEverythingThatHasBeenLoaded();
}
firstMessage = null;
}
// Try to get the dates range for new boundary messages
DateRange newAvailTime = GetAvailableDateRangeHelper(newFirst, newLast);
firstMessage = newFirst;
// Getting here means that the boundaries changed.
// Fire the notification.
var positionsRange = new FileRange.Range(reader.BeginPosition, reader.EndPosition);
if (!incrementalMode)
{
readerContentsEtag = reader.GetContentsEtag();
}
int contentsEtag =
readerContentsEtag
^ positionsRange.Begin.GetHashCode()
^ positionsRange.End.GetHashCode();
StatsTransaction(stats =>
{
stats.AvailableTime = newAvailTime;
LogProviderStatsFlag f = LogProviderStatsFlag.AvailableTime;
if (incrementalMode)
{
f |= LogProviderStatsFlag.AvailableTimeUpdatedIncrementallyFlag;
}
stats.TotalBytes = CalcTotalBytesStats(reader);
f |= LogProviderStatsFlag.BytesCount;
stats.PositionsRange = positionsRange;
f |= LogProviderStatsFlag.PositionsRange;
stats.PositionsRangeUpdatesCount++;
if (stats.ContentsEtag == null || contentsEtag != stats.ContentsEtag.Value)
{
stats.ContentsEtag = contentsEtag;
f |= LogProviderStatsFlag.ContentsEtag;
}
return(f);
});
return(true);
}
