/// <summary>
/// Report the current statistics of sampling rules and
/// get back the new assigned quota/TTL/Interval from the X-Ray service.
/// The call is proxied and signed via X-Ray Daemon.
/// </summary>
/// <param name="rules">List of <see cref="SamplingRule"/>.</param>
/// <returns>Instance of <see cref="GetSamplingRulesResponse"/>.</returns>
public async Task <GetSamplingTargetsResponse> GetSamplingTargets(List <SamplingRule> rules)
{
GetSamplingTargetsRequest request = new GetSamplingTargetsRequest();
IList <Target> newTargets = new List <Target>();
DateTime currentTime = TimeStamp.CurrentDateTime();
List <SamplingStatisticsDocument> samplingStatisticsDocuments = GetSamplingStatisticsDocuments(rules, currentTime);
request.SamplingStatisticsDocuments = samplingStatisticsDocuments;
Task <Model.GetSamplingTargetsResponse> responseTask;
lock (_xrayClientLock)
{
RefreshEndPoint();
responseTask = _xrayClient.GetSamplingTargetsAsync(request);
}
var response = await responseTask;
foreach (var record in response.SamplingTargetDocuments)
{
Target t = new Target(record.RuleName, record.FixedRate, record.ReservoirQuota, record.ReservoirQuotaTTL, record.Interval);
newTargets.Add(t);
}
GetSamplingTargetsResponse result = new GetSamplingTargetsResponse(newTargets);
result.RuleFreshness = new TimeStamp(response.LastRuleModification);
return(result);
}
internal async Task RefreshTargets()
{
List <SamplingRule> rules = GetCandidates();
if (rules == null || rules.Count == 0)
{
_logger.DebugFormat("There is no sampling rule statistics to report, skipping.");
return;
}
_logger.DebugFormat("Reporting rule statistics to get new quota.");
GetSamplingTargetsResponse response = await _connector.GetSamplingTargets(rules);
_ruleCache.LoadTargets(response.Targets);
if (response.RuleFreshness.IsGreaterThan(_ruleCache.LastUpdated))
{
_logger.InfoFormat("Performing out-of-band sampling rule polling to fetch updated rules.");
_rulePoller.WakeUp();
}
}
