// add a counter to the counter list
public void AddCounter(CounterData counter)
{
if (counters.Count < MAX_COUNTERS)
{
counters.Add(counter);
}
}
// fetches a counter - used as a callback
// if the counter is a big multi-instance counter it doesn't sleep the sampleTime
// because it take a lot of time and it won't be able to send data faster than once per second anyway
void FetchCounter(object o)
{
List <PerformanceCounter> entry = (List <PerformanceCounter>)o;
while (true)
{
DateTime time = DateTime.Now;
PerformanceCounter pc0 = entry[0];
// obtain event.id and event.Description
var query = from CounterData cd in counters where cd.CategoryName == pc0.CategoryName && cd.CounterName == pc0.CounterName select cd;
CounterData qcd = query.FirstOrDefault();
int id = qcd.id;
string description = qcd.description;
if (entry.Count == 1)
{
// single-instance
int val = (int)Math.Round(pc0.NextValue());
if (val < 0)
{
val = 0;
}
ParseData(new SEvent(id, time, description, "global", EventType.SINGLE, new string[] { "value" }, new string[] { val.ToString() }));
Thread.Sleep(samplingTime);
}
if (entry.Count > 1)
{
// multi-instance
SEvent[] events = new SEvent[entry.Count];
int i = 0;
foreach (PerformanceCounter pc in entry)
{
string instance = pc.InstanceName;
int val;
try
{
val = (int)Math.Round(pc.NextValue());
if (val < 0)
{
val = 0;
}
}
catch
{
val = -1;
}
events[i++] = new SEvent(id, time, description, instance, EventType.SINGLE, new string[] { "value" }, new string[] { val.ToString() });
}
ParseData(new MEvent(id, time, description, EventType.MULTIPLE, events.Length, events));
// if it's a big multi-instance counter skip the sleeping part
if (entry.Count < 10)
{
Thread.Sleep(samplingTime);
}
}
}
}
// remove a counter from the counter list
public void RemoveCounter(CounterData counter)
{
counters.Remove(counter);
}