/// <summary>
/// Add a filter by Event Type
/// </summary>
/// <param name="filter"></param>
/// <returns></returns>
public ReadFilter CombineFilter(ReadFilter filter)
{
Assert.IsNotNull(filter, "filter != null");
foreach (var oneTraceRecordFilter in filter.TraceRecordFilters)
{
this.TraceRecordFilters.Add(oneTraceRecordFilter);
}
return(this);
}
public Task <IEnumerable <TraceRecord> > ReadBackwardAsync(ReadFilter filter, int count, CancellationToken token)
{
return(this.ReadRecordsAsync(filter, count, false, token));
}
private async Task <IEnumerable <TraceRecord> > ReadRecordsAsync(ReadFilter filter, int count, bool forwardDirection, CancellationToken token)
{
var iterationStartTime = this.boundStart;
var iterationEndTime = this.boundEnd;
var traceResults = new List <TraceRecord>();
var timeSpanIncrement = StartingQueryInterval;
while (true)
{
if (forwardDirection)
{
iterationEndTime = iterationStartTime + timeSpanIncrement;
if (iterationEndTime > this.boundEnd)
{
iterationEndTime = this.boundEnd;
}
}
else
{
iterationStartTime = iterationEndTime - timeSpanIncrement;
if (iterationStartTime < this.boundStart)
{
iterationStartTime = this.boundStart;
}
}
if (iterationStartTime >= iterationEndTime)
{
break;
}
var results = await this.traceStoreReader.ReadTraceRecordsAsync(new Common.Duration(iterationStartTime, iterationEndTime), filter, token).ConfigureAwait(false);
traceResults.AddRange(results);
// We already have enough results.
if (traceResults.Count >= count)
{
break;
}
// Double the query interval with each iteration
timeSpanIncrement = TimeSpan.FromTicks(timeSpanIncrement.Ticks * 2);
if (forwardDirection)
{
iterationStartTime = iterationEndTime;
}
else
{
iterationEndTime = iterationStartTime;
}
}
if (forwardDirection)
{
return(traceResults.Take(count).OrderBy(item => item.TimeStamp));
}
else
{
return(traceResults.Take(count).OrderByDescending(item => item.TimeStamp));
}
}
public async Task <TraceRecord> ReadBackwardSingleAsync(ReadFilter filter, CancellationToken token)
{
return((await this.ReadBackwardAsync(filter, 1, token).ConfigureAwait(false)).SingleOrDefault());
}