/// <summary>Initializes a new instance of the <see cref="CategorySample"/> class. Instantiates a <see cref="CategorySample"/> class.</summary>
/// <param name="data">Performance data.</param>
/// <param name="categoryNameIndex">Category name index.</param>
/// <param name="counterNameIndex">Counter name index.</param>
/// <param name="library">Performance library.</param>
public CategorySample(byte[] data, int categoryNameIndex, int counterNameIndex, PerfLib library)
{
if (library == null)
{
return;
}
this.library = library;
NativeMethods.PERF_DATA_BLOCK dataBlock = new NativeMethods.PERF_DATA_BLOCK();
GCHandle handle = GCHandle.Alloc(data, GCHandleType.Pinned);
try
{
IntPtr dataRef = handle.AddrOfPinnedObject();
Marshal.PtrToStructure(dataRef, dataBlock);
dataRef = (IntPtr)((long)dataRef + dataBlock.HeaderLength);
int numPerfObjects = dataBlock.NumObjectTypes;
if (numPerfObjects == 0)
{
this.CounterTable = new Dictionary <int, CounterDefinitionSample>();
this.InstanceNameTable = new Dictionary <string, int>(StringComparer.OrdinalIgnoreCase);
return;
}
// Need to find the right category, GetPerformanceData might return several of them.
NativeMethods.PERF_OBJECT_TYPE perfObject = new NativeMethods.PERF_OBJECT_TYPE();
bool foundCategory = false;
for (int index = 0; index < numPerfObjects; index++)
{
Marshal.PtrToStructure(dataRef, perfObject);
if (perfObject.ObjectNameTitleIndex == categoryNameIndex)
{
foundCategory = true;
break;
}
dataRef = (IntPtr)((long)dataRef + perfObject.TotalByteLength);
}
if (!foundCategory)
{
throw new InvalidOperationException("Category not found for categoryNameIndex " + categoryNameIndex);
}
int counterNumber = perfObject.NumCounters;
int instanceNumber = perfObject.NumInstances;
bool isMultiInstance = instanceNumber != -1;
// Move pointer forward to end of PERF_OBJECT_TYPE
dataRef = (IntPtr)((long)dataRef + perfObject.HeaderLength);
CounterDefinitionSample[] samples = new CounterDefinitionSample[counterNumber];
CounterDefinitionSample sample = null;
this.CounterTable = new Dictionary <int, CounterDefinitionSample>(counterNumber);
for (int index = 0; index < samples.Length; ++index)
{
NativeMethods.PERF_COUNTER_DEFINITION perfCounter = new NativeMethods.PERF_COUNTER_DEFINITION();
Marshal.PtrToStructure(dataRef, perfCounter);
samples[index] = new CounterDefinitionSample(perfCounter, instanceNumber);
if (perfCounter.CounterNameTitleIndex == counterNameIndex)
{
sample = samples[index];
}
dataRef = (IntPtr)((long)dataRef + perfCounter.ByteLength);
int currentSampleType = samples[index].CounterType;
if (!CategorySample.IsBaseCounter(currentSampleType))
{
// We'll put only non-base counters in the table.
if (currentSampleType != NativeMethods.PERF_COUNTER_NODATA)
{
this.CounterTable[samples[index].NameIndex] = samples[index];
}
}
else
{
// ignore base counters
}
}
if (sample == null)
{
throw new InvalidOperationException("Could not find the counter " + counterNameIndex);
}
// now set up the InstanceNameTable.
if (!isMultiInstance)
{
throw new InvalidOperationException("Single instance categories are not supported");
}
string[] parentInstanceNames = null;
this.InstanceNameTable = new Dictionary <string, int>(instanceNumber, StringComparer.OrdinalIgnoreCase);
for (int i = 0; i < instanceNumber; i++)
{
NativeMethods.PERF_INSTANCE_DEFINITION perfInstance = new NativeMethods.PERF_INSTANCE_DEFINITION();
Marshal.PtrToStructure(dataRef, perfInstance);
if (perfInstance.ParentObjectTitleIndex > 0 && parentInstanceNames == null)
{
parentInstanceNames = this.GetInstanceNamesFromIndex(perfInstance.ParentObjectTitleIndex);
}
string instanceName;
if (parentInstanceNames != null && perfInstance.ParentObjectInstance >= 0 &&
perfInstance.ParentObjectInstance < parentInstanceNames.Length - 1)
{
instanceName = parentInstanceNames[perfInstance.ParentObjectInstance] + "/"
+ Marshal.PtrToStringUni((IntPtr)((long)dataRef + perfInstance.NameOffset));
}
else
{
instanceName = Marshal.PtrToStringUni((IntPtr)((long)dataRef + perfInstance.NameOffset));
}
// in some cases instance names are not unique (Process), same as perfmon, so generate a unique name
string newInstanceName = instanceName;
int newInstanceNumber = 1;
while (true)
{
if (!this.InstanceNameTable.ContainsKey(newInstanceName))
{
this.InstanceNameTable[newInstanceName] = i;
break;
}
else
{
newInstanceName = instanceName + "#" + newInstanceNumber.ToString(CultureInfo.InvariantCulture);
++newInstanceNumber;
}
}
dataRef = (IntPtr)((long)dataRef + perfInstance.ByteLength);
// we only need one counter right now, to get more - use the following pattern:
////foreach (CounterDefinitionSample s in samples)
////{
//// s.SetInstanceValue(i, dataRef);
////}
sample.SetInstanceValue(i, dataRef);
dataRef = (IntPtr)((long)dataRef + Marshal.ReadInt32(dataRef));
}
}
finally
{
handle.Free();
}
}
private string[] GetInstanceNamesFromIndex(int categoryIndex)
{
byte[] data = this.library.GetPerformanceData(categoryIndex.ToString(CultureInfo.InvariantCulture));
GCHandle handle = GCHandle.Alloc(data, GCHandleType.Pinned);
try
{
IntPtr dataRef = handle.AddrOfPinnedObject();
NativeMethods.PERF_DATA_BLOCK dataBlock = new NativeMethods.PERF_DATA_BLOCK();
Marshal.PtrToStructure(dataRef, dataBlock);
dataRef = (IntPtr)((long)dataRef + dataBlock.HeaderLength);
int numPerfObjects = dataBlock.NumObjectTypes;
NativeMethods.PERF_OBJECT_TYPE perfObject = null;
bool foundCategory = false;
for (int index = 0; index < numPerfObjects; index++)
{
perfObject = new NativeMethods.PERF_OBJECT_TYPE();
Marshal.PtrToStructure(dataRef, perfObject);
if (perfObject.ObjectNameTitleIndex == categoryIndex)
{
foundCategory = true;
break;
}
dataRef = (IntPtr)((long)dataRef + perfObject.TotalByteLength);
}
if (!foundCategory)
{
return(ArrayExtensions.Empty <string>());
}
int counterNumber = perfObject.NumCounters;
int instanceNumber = perfObject.NumInstances;
dataRef = (IntPtr)((long)dataRef + perfObject.HeaderLength);
if (instanceNumber == -1)
{
return(ArrayExtensions.Empty <string>());
}
CounterDefinitionSample[] samples = new CounterDefinitionSample[counterNumber];
for (int index = 0; index < samples.Length; ++index)
{
NativeMethods.PERF_COUNTER_DEFINITION perfCounter = new NativeMethods.PERF_COUNTER_DEFINITION();
Marshal.PtrToStructure(dataRef, perfCounter);
dataRef = (IntPtr)((long)dataRef + perfCounter.ByteLength);
}
string[] instanceNames = new string[instanceNumber];
for (int i = 0; i < instanceNumber; i++)
{
NativeMethods.PERF_INSTANCE_DEFINITION perfInstance = new NativeMethods.PERF_INSTANCE_DEFINITION();
Marshal.PtrToStructure(dataRef, perfInstance);
instanceNames[i] = Marshal.PtrToStringUni((IntPtr)((long)dataRef + perfInstance.NameOffset));
dataRef = (IntPtr)((long)dataRef + perfInstance.ByteLength);
dataRef = (IntPtr)((long)dataRef + Marshal.ReadInt32(dataRef));
}
return(instanceNames);
}
finally
{
handle.Free();
}
}
