private void Initialize(PerformanceCounterInputConfiguration configuration, IHealthReporter healthReporter)
{
this.syncObject = new object();
this.subject = new EventFlowSubject <EventData>();
this.healthReporter = healthReporter;
this.processInstanceNameCache = new ProcessInstanceNameCache();
this.sampleInterval = TimeSpan.FromMilliseconds(configuration.SampleIntervalMsec);
var currentProcess = Process.GetCurrentProcess();
this.currentProcessName = currentProcess.ProcessName;
this.currentProcessId = currentProcess.Id;
// The CLR Process ID counter used for process ID to counter instance name mapping for CLR counters will not read correctly
// until at least one garbage collection is performed, so we will force one now.
// The listener is usually created during service startup so the GC should not take very long.
GC.Collect();
this.trackedPerformanceCounters = new List <TrackedPerformanceCounter>();
foreach (var counterConfiguration in configuration.Counters)
{
if (!counterConfiguration.Validate())
{
healthReporter.ReportProblem($"{nameof(PerformanceCounterInput)}: configuration for counter {counterConfiguration.CounterName} is invalid");
}
else
{
this.trackedPerformanceCounters.Add(new TrackedPerformanceCounter(counterConfiguration));
}
}
this.collectionTimer = new Timer(this.DoCollection, null, this.sampleInterval, TimeSpan.FromDays(1));
}
public bool SampleNextValue(ProcessInstanceNameCache processInstanceNameCache, out float newValue)
{
Requires.NotNull(processInstanceNameCache, nameof(processInstanceNameCache));
newValue = 0;
if (disposed)
{
return(false);
}
var now = DateTimeOffset.UtcNow;
if (now - this.lastAccessedOn < TimeSpan.FromMilliseconds(this.Configuration.SamplingIntervalMsec))
{
return(false);
}
string instanceName = processInstanceNameCache.GetCounterInstanceNameForCurrentProcess(this.Configuration);
this.lastAccessedOn = now;
if (this.counter == null || (!string.IsNullOrEmpty(instanceName) && instanceName != this.lastInstanceName))
{
if (this.counter != null)
{
this.counter.Dispose();
}
this.counter = new PerformanceCounter(
this.Configuration.CounterCategory,
this.Configuration.CounterName,
instanceName,
readOnly: true);
}
this.lastInstanceName = instanceName;
newValue = this.counter.NextValue();
return(true);
}