public void Start()
{
lock (this)
{
Stop();
monitorThread = new Thread(monitorRunner);
monitorThread.Name = "PerfMonManager " + spec.GetLabel();
monitorThread.IsBackground = true;
monitorThread.Start();
}
}
/// <summary>
/// Loops until this instance is stopped, gathering performance data at the specified interval.
/// </summary>
private void monitorRunner()
{
try
{
int checkInstanceNameCounter = 0;
int intervalMs = spec.GetIntervalMs();
while (true)
{
try
{
string instanceName = spec.GetInstanceName();
if (instanceName == null && spec.processFinder != null)
{
Logger.Info("Failed to find instance name for monitor " + spec.GetLabel());
Thread.Sleep(Math.Max(intervalMs, 10000));
continue;
}
using (PerformanceCounter counter = new PerformanceCounter(spec.categoryName, spec.counterName, instanceName, true))
{
counter.NextValue();
Thread.Sleep(intervalMs);
while (true)
{
if (spec.processFinder != null && ++checkInstanceNameCounter % 15 == 0 && spec.GetInstanceName() != counter.InstanceName)
{
break; // Breaking here will cause the PerformanceCounter to be reinitialized. This will catch process restarts.
}
PerfMonValue pmv = new PerfMonValue();
pmv.Time = (TimeUtil.GetTimeInMsSinceEpoch() / 100) * 100; // Round off to in 100ms interals so the graph tooltip works a little better.
pmv.Value = counter.NextValue();
lock (this)
{
values.AddFirst(pmv);
while (values.Last.Value.Time < pmv.Time - maxAge)
{
values.RemoveLast();
}
}
Thread.Sleep(intervalMs);
}
}
}
catch (ThreadAbortException) { }
catch (Exception ex)
{
Logger.Debug(ex);
}
}
}
catch (ThreadAbortException) { }
catch (Exception ex)
{
Logger.Debug(ex);
}
}