public PerformanceCounterSampleSet ReadNextSet()
{
this._firstRead.Wait();
long fileTimeStamp = 0;
uint returnCode = this._isPreVista ? Apis.PdhCollectQueryData(this._safeQueryHandle)
: Apis.PdhCollectQueryDataWithTime(this._safeQueryHandle, ref fileTimeStamp);
if (this._isLastSampleBad)
{
return(null);
}
if (returnCode != PdhResults.PDH_CSTATUS_VALID_DATA)
{
//this makes sure next call to ReadNextSet doesn't examine the data, and just returns null
this._isLastSampleBad = true;
return(null);
}
DateTime now = (_isPreVista || returnCode == PdhResults.PDH_NO_DATA) ? DateTime.Now :
new DateTime(DateTime.FromFileTimeUtc(fileTimeStamp).Ticks, DateTimeKind.Local);
PerformanceCounterSample[] counterSamples = new PerformanceCounterSample[this._consumerPathToHandleAndInstanceMap.Count];
int samplesRead = 0;
foreach (string key in this._consumerPathToHandleAndInstanceMap.Keys)
{
IntPtr counterHandle = this._consumerPathToHandleAndInstanceMap[key].CounterHandle;
CounterInfo info = PdhHelper.GetCounterInfo(counterHandle);
var sample = GetRawCounterSample(counterHandle, key, info, now);
var performanceSample = sample.PerformanceCounterSample ?? GetFormattedCounterSample(counterHandle, key, info, sample.RawCounter);
if (!this._ignoreBadStatusCodes && (performanceSample.Status != 0))
{
throw BuildException(performanceSample.Status);
}
if (performanceSample.Status != 0)
{
_log.Info(() => string.Format("Status {0:x} ignored for counter {1}", performanceSample.Status, key));
continue;
}
counterSamples[samplesRead++] = performanceSample;
}
this._isLastSampleBad = false;
//in the event we skipped bad data
if (samplesRead < counterSamples.Length)
{
Array.Resize(ref counterSamples, samplesRead);
}
return(new PerformanceCounterSampleSet(this._isPreVista ? counterSamples[samplesRead].Timestamp : now, counterSamples));
}
private PerformanceCounterSample GetFormattedCounterSample(IntPtr counterHandle, string name, CounterInfo info, PDH_RAW_COUNTER rawCounter)
{
IntPtr counterType = new IntPtr(0);
long fileTime = (((long)rawCounter.TimeStamp.dwHighDateTime) << 0x20) + rawCounter.TimeStamp.dwLowDateTime;
DateTime timeStamp2 = new DateTime(DateTime.FromFileTimeUtc(fileTime).Ticks, DateTimeKind.Local);
PDH_FMT_COUNTERVALUE_DOUBLE doubleFormattedCounter;
uint returnCode = Apis.PdhGetFormattedCounterValue(counterHandle, PdhFormat.PDH_FMT_NOCAP100 + PdhFormat.PDH_FMT_DOUBLE, out counterType, out doubleFormattedCounter);
//vista and above, any non-valid result is returned like this
if ((!_isPreVista && (returnCode != PdhResults.PDH_CSTATUS_VALID_DATA)) ||
//below vista, return data for no_data and invalid_data, otherwise throw
(_isPreVista && (returnCode == PdhResults.PDH_INVALID_DATA || returnCode == PdhResults.PDH_NO_DATA)))
{
return(new PerformanceCounterSample(name, this._consumerPathToHandleAndInstanceMap[name].InstanceName,
0.0, (ulong)rawCounter.FirstValue, (ulong)rawCounter.SecondValue, rawCounter.MultiCount,
//TODO: not sure if its useful to stuff a bad returnCode in for status, as VerifySamples will throw when status isn't 0... not sure that's useful
//TODO: original code just uses pdh_raw_counter.CStatus when _isPreVista
(PerformanceCounterType)info.Type, info.DefaultScale, info.TimeBase, timeStamp2, (ulong)fileTime, (doubleFormattedCounter.CStatus == 0) ? returnCode : rawCounter.CStatus));
}
else if (_isPreVista && (returnCode != PdhResults.PDH_CSTATUS_VALID_DATA))
{
throw BuildException(returnCode);
}
return(new PerformanceCounterSample(name, this._consumerPathToHandleAndInstanceMap[name].InstanceName,
doubleFormattedCounter.doubleValue, (ulong)rawCounter.FirstValue, (ulong)rawCounter.SecondValue, rawCounter.MultiCount,
(PerformanceCounterType)counterType.ToInt32(), info.DefaultScale, info.TimeBase, timeStamp2, (ulong)fileTime, doubleFormattedCounter.CStatus));
}
private RawCounterSample GetRawCounterSample(IntPtr counterHandle, string key, CounterInfo info, DateTime?now)
{
IntPtr counterType = new IntPtr(0);
PDH_RAW_COUNTER rawCounter;
uint returnCode = Apis.PdhGetRawCounterValue(counterHandle, out counterType, out rawCounter);
//vista and above, any non-valid result is returned like this
if ((!_isPreVista && (returnCode != PdhResults.PDH_CSTATUS_VALID_DATA)) ||
//below vista, return data for no_data and invalid_data, otherwise throw
(_isPreVista && (returnCode == PdhResults.PDH_INVALID_DATA || returnCode == PdhResults.PDH_NO_DATA)))
{
DateTime timeStamp = this._isPreVista ? DateTime.Now : now.Value;
return(new RawCounterSample()
{
PerformanceCounterSample = new PerformanceCounterSample(key, this._consumerPathToHandleAndInstanceMap[key].InstanceName,
0.0, 0L, 0L, 0,
//TODO: original code just uses pdh_raw_counter.CStatus when _isPreVista
//TODO: not sure if its useful to stuff a bad returnCode in for status, as VerifySamples will throw when status isn't 0... not sure that's useful
PerformanceCounterType.RawBase, info.DefaultScale, info.TimeBase, timeStamp, (ulong)timeStamp.ToFileTime(), (rawCounter.CStatus == 0) ? returnCode : rawCounter.CStatus)
});
}
else if (_isPreVista && (returnCode != PdhResults.PDH_CSTATUS_VALID_DATA))
{
throw BuildException(returnCode);
}
//this is only used when return code is 0 -- PdhResults.PDH_CSTATUS_VALID_DATA
return(new RawCounterSample()
{
RawCounter = rawCounter
});
}
private RawCounterSample GetRawCounterSample(IntPtr counterHandle, string key, CounterInfo info, DateTime? now)
{
IntPtr counterType = new IntPtr(0);
PDH_RAW_COUNTER rawCounter;
uint returnCode = Apis.PdhGetRawCounterValue(counterHandle, out counterType, out rawCounter);
//vista and above, any non-valid result is returned like this
if ((!_isPreVista && (returnCode != PdhResults.PDH_CSTATUS_VALID_DATA)) ||
//below vista, return data for no_data and invalid_data, otherwise throw
(_isPreVista && (returnCode == PdhResults.PDH_INVALID_DATA || returnCode == PdhResults.PDH_NO_DATA)))
{
DateTime timeStamp = this._isPreVista ? DateTime.Now : now.Value;
return new RawCounterSample()
{
PerformanceCounterSample = new PerformanceCounterSample(key, this._consumerPathToHandleAndInstanceMap[key].InstanceName,
0.0, 0L, 0L, 0,
//TODO: original code just uses pdh_raw_counter.CStatus when _isPreVista
//TODO: not sure if its useful to stuff a bad returnCode in for status, as VerifySamples will throw when status isn't 0... not sure that's useful
PerformanceCounterType.RawBase, info.DefaultScale, info.TimeBase, timeStamp, (ulong)timeStamp.ToFileTime(), (rawCounter.CStatus == 0) ? returnCode : rawCounter.CStatus)
};
}
else if (_isPreVista && (returnCode != PdhResults.PDH_CSTATUS_VALID_DATA))
{
throw BuildException(returnCode);
}
//this is only used when return code is 0 -- PdhResults.PDH_CSTATUS_VALID_DATA
return new RawCounterSample() { RawCounter = rawCounter };
}
private PerformanceCounterSample GetFormattedCounterSample(IntPtr counterHandle, string name, CounterInfo info, PDH_RAW_COUNTER rawCounter)
{
IntPtr counterType = new IntPtr(0);
long fileTime = (((long)rawCounter.TimeStamp.dwHighDateTime) << 0x20) + rawCounter.TimeStamp.dwLowDateTime;
DateTime timeStamp2 = new DateTime(DateTime.FromFileTimeUtc(fileTime).Ticks, DateTimeKind.Local);
PDH_FMT_COUNTERVALUE_DOUBLE doubleFormattedCounter;
uint returnCode = Apis.PdhGetFormattedCounterValue(counterHandle, PdhFormat.PDH_FMT_NOCAP100 + PdhFormat.PDH_FMT_DOUBLE, out counterType, out doubleFormattedCounter);
//vista and above, any non-valid result is returned like this
if ((!_isPreVista && (returnCode != PdhResults.PDH_CSTATUS_VALID_DATA)) ||
//below vista, return data for no_data and invalid_data, otherwise throw
(_isPreVista && (returnCode == PdhResults.PDH_INVALID_DATA || returnCode == PdhResults.PDH_NO_DATA)))
{
return new PerformanceCounterSample(name, this._consumerPathToHandleAndInstanceMap[name].InstanceName,
0.0, (ulong)rawCounter.FirstValue, (ulong)rawCounter.SecondValue, rawCounter.MultiCount,
//TODO: not sure if its useful to stuff a bad returnCode in for status, as VerifySamples will throw when status isn't 0... not sure that's useful
//TODO: original code just uses pdh_raw_counter.CStatus when _isPreVista
(PerformanceCounterType)info.Type, info.DefaultScale, info.TimeBase, timeStamp2, (ulong)fileTime, (doubleFormattedCounter.CStatus == 0) ? returnCode : rawCounter.CStatus);
}
else if (_isPreVista && (returnCode != PdhResults.PDH_CSTATUS_VALID_DATA))
{
throw BuildException(returnCode);
}
return new PerformanceCounterSample(name, this._consumerPathToHandleAndInstanceMap[name].InstanceName,
doubleFormattedCounter.doubleValue, (ulong)rawCounter.FirstValue, (ulong)rawCounter.SecondValue, rawCounter.MultiCount,
(PerformanceCounterType)counterType.ToInt32(), info.DefaultScale, info.TimeBase, timeStamp2, (ulong)fileTime, doubleFormattedCounter.CStatus);
}
private static CounterInfo GetCounterInfo(IntPtr counterHandle)
{
CounterInfo info = new CounterInfo();
IntPtr counterBufferSize = new IntPtr(0);
uint returnCode = Apis.PdhGetCounterInfo(counterHandle, false, ref counterBufferSize, IntPtr.Zero);
if (returnCode != PdhResults.PDH_MORE_DATA)
{
return info;
}
IntPtr bufferPointer = Marshal.AllocHGlobal(counterBufferSize.ToInt32());
try
{
if ((Apis.PdhGetCounterInfo(counterHandle, false, ref counterBufferSize, bufferPointer) == PdhResults.PDH_CSTATUS_VALID_DATA) && (bufferPointer != IntPtr.Zero))
{
info.Type = (uint)Marshal.ReadInt32(bufferPointer, 4);
info.DefaultScale = (uint)Marshal.ReadInt32(bufferPointer, 20);
}
}
finally
{
Marshal.FreeHGlobal(bufferPointer);
}
ulong timeBase;
Apis.PdhGetCounterTimeBase(counterHandle, out timeBase);
info.TimeBase = timeBase;
return info;
}