public static PerfCounter[] AddDefaultCountersForClient(string clientId, PerfCounter[] existingCounters)
{
// TODO: add existingCounters if they are valid counters and remove set from default.
// the hash for existingCounters may be stale, so need to recalc and then match.
_clientPerformanceCounters.TryAdd(clientId, _defaultPerformanceCounters.ToList());
// take snapshot of current counters. another client may be updating it.
var allCounters = _perfomanceCounters.ToDictionary(x => x.Key, x => x.Value);
// default counters should never be removed. so this is safe.
return _defaultPerformanceCounters.Select(x => new { hash = x, counter = allCounters[x] }).Select(x => new PerfCounter() { CategoryName = x.counter.CategoryName, CounterHelp = x.counter.CounterHelp, CounterName = x.counter.CounterName, CounterType = x.counter.CounterType.ToString(), InstanceName = x.counter.InstanceName, Hash = x.hash }).ToArray();
}
public object GetPerformanceCounters(PerfCounter[] existingCounters)
{
return new { snapshotMilliseconds = PerformanceCounterUtils.SNAPSHOT_MILLISECONDS, perfCounters = PerformanceCounterUtils.AddDefaultCountersForClient(Context.ConnectionId, existingCounters) };
}