/// <summary>
///
/// </summary>
/// <param name="telemetryPipeline"></param>
/// <returns></returns>
public static MetricManager Metrics(this TelemetryConfiguration telemetryPipeline)
{
if (telemetryPipeline == null)
{
return(null);
}
// Fast path for the default configuration:
if (telemetryPipeline == TelemetryConfiguration.Active)
{
MetricManager manager = s_defaultMetricManager;
if (manager == null)
{
var pipelineAdapter = new ApplicationInsightsTelemetryPipeline(telemetryPipeline);
MetricManager newManager = new MetricManager(pipelineAdapter);
MetricManager prevManager = Interlocked.CompareExchange(ref s_defaultMetricManager, newManager, null);
if (prevManager == null)
{
return(newManager);
}
else
{
Task fireAndForget = newManager.StopDefaultAggregationCycleAsync();
return(prevManager);
}
}
return(manager);
}
// Ok, we have a non-default config. Get the table:
ConditionalWeakTable <TelemetryConfiguration, MetricManager> metricManagers = s_metricManagers;
if (metricManagers == null)
{
ConditionalWeakTable <TelemetryConfiguration, MetricManager> newTable = new ConditionalWeakTable <TelemetryConfiguration, MetricManager>();
ConditionalWeakTable <TelemetryConfiguration, MetricManager> prevTable = Interlocked.CompareExchange(ref s_metricManagers, newTable, null);
metricManagers = prevTable ?? newTable;
}
// Get the manager from the table:
{
MetricManager manager = GetOrGreateFromTable(telemetryPipeline, metricManagers);
return(manager);
}
}
internal MetricManager GetMetricManager(bool createIfNotExists)
{
MetricManager manager = this.metricManager;
if (manager == null && createIfNotExists)
{
var pipelineAdapter = new ApplicationInsightsTelemetryPipeline(this);
MetricManager newManager = new MetricManager(pipelineAdapter);
MetricManager prevManager = Interlocked.CompareExchange(ref this.metricManager, newManager, null);
if (prevManager == null)
{
manager = newManager;
}
else
{
// We just created a new manager that we are not using. Stop is before discarding.
Task fireAndForget = newManager.StopDefaultAggregationCycleAsync();
manager = prevManager;
}
}
return(manager);
}
