protected void Spectate(CancellationToken token, TaskScheduler scheduler = null)
{
var metricPrefix = _configuration.MetricPrefix;
try
{
Log.InfoFormat("Sampling for {0} configured metric definitions", _configuration.Metrics.Count);
var options = new ParallelOptions
{
CancellationToken = token,
MaxDegreeOfParallelism = 8,
TaskScheduler = scheduler
};
var allMetrics = new ConcurrentBag <Metric>();
Parallel.ForEach(_configuration.Metrics, options, metric =>
{
var queryableSource = _queryableSourceFactory.Create(metric.Source);
var metricValues = queryableSource.QueryValue(metric.Path).ToList();
Log.DebugFormat(" -> Queried '{0}' from '{1}', resulting in {2} metric samples (unfiltered)", metric.Path, metric.Source, metricValues.Count);
foreach (var sample in metricValues)
{
if (!Included(metric.Include, sample.Instance) || Excluded(metric.Exclude, sample.Instance))
{
continue;
}
var metricName = _metricFormatter.Format(metricPrefix, sample.Instance, metric.Template);
allMetrics.Add(new Metric(metricName, sample.Value, metric.Type));
}
});
Log.DebugFormat("Obtained {0} metrics to publish, publishing now...", allMetrics.Count);
foreach (var metric in allMetrics)
{
_publisher.Publish(metric);
}
}
catch (Exception ex)
{
Log.Error("Exception occurred while spectating", ex);
}
}
