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PerformanceCounter.cs
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PerformanceCounter.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.ComponentModel;
using System.Globalization;
using System.Runtime.CompilerServices;
using System.Threading;
namespace System.Diagnostics
{
/// <summary>
/// Performance Counter component.
/// This class provides support for NT Performance counters.
/// It handles both the existing counters (accessible by Perf Registry Interface)
/// and user defined (extensible) counters.
/// This class is a part of a larger framework, that includes the perf dll object and
/// perf service.
/// </summary>
public sealed class PerformanceCounter : Component, ISupportInitialize
{
private string _machineName;
private string _categoryName;
private string _counterName;
private string _instanceName;
private PerformanceCounterInstanceLifetime _instanceLifetime = PerformanceCounterInstanceLifetime.Global;
private bool _isReadOnly;
private bool _initialized;
private string _helpMsg;
private int _counterType = -1;
// Cached old sample
private CounterSample _oldSample = CounterSample.Empty;
// Cached IP Shared Performanco counter
private SharedPerformanceCounter _sharedCounter;
[Obsolete("PerformanceCounter.DefaultFileMappingSize has been deprecated and is not used. Use machine.config or an application configuration file to set the size of the PerformanceCounter file mapping instead.")]
public static int DefaultFileMappingSize = 524288;
private object _instanceLockObject;
private object InstanceLockObject
{
get
{
if (_instanceLockObject == null)
{
object o = new object();
Interlocked.CompareExchange(ref _instanceLockObject, o, null);
}
return _instanceLockObject;
}
}
/// <summary>
/// The defaut constructor. Creates the perf counter object
/// </summary>
public PerformanceCounter()
{
_machineName = ".";
_categoryName = string.Empty;
_counterName = string.Empty;
_instanceName = string.Empty;
_isReadOnly = true;
GC.SuppressFinalize(this);
}
/// <summary>
/// Creates the Performance Counter Object
/// </summary>
public PerformanceCounter(string categoryName, string counterName, string instanceName, string machineName)
: this(categoryName, counterName, instanceName, machineName, skipInit: false)
{
}
internal PerformanceCounter(string categoryName, string counterName, string instanceName, string machineName, bool skipInit)
{
MachineName = machineName;
CategoryName = categoryName;
CounterName = counterName;
InstanceName = instanceName;
_isReadOnly = true;
if (skipInit)
_initialized = true;
else
Initialize();
GC.SuppressFinalize(this);
}
/// <summary>
/// Creates the Performance Counter Object on local machine.
/// </summary>
public PerformanceCounter(string categoryName, string counterName, string instanceName) :
this(categoryName, counterName, instanceName, true)
{
}
/// <summary>
/// Creates the Performance Counter Object on local machine.
/// </summary>
public PerformanceCounter(string categoryName, string counterName, string instanceName, bool readOnly)
{
if (!readOnly)
{
VerifyWriteableCounterAllowed();
}
MachineName = ".";
CategoryName = categoryName;
CounterName = counterName;
InstanceName = instanceName;
_isReadOnly = readOnly;
Initialize();
GC.SuppressFinalize(this);
}
/// <summary>
/// Creates the Performance Counter Object, assumes that it's a single instance
/// </summary>
public PerformanceCounter(string categoryName, string counterName) :
this(categoryName, counterName, true)
{
}
/// <summary>
/// Creates the Performance Counter Object, assumes that it's a single instance
/// </summary>
public PerformanceCounter(string categoryName, string counterName, bool readOnly) :
this(categoryName, counterName, "", readOnly)
{
}
/// <summary>
/// Returns the performance category name for this performance counter
/// </summary>
public string CategoryName
{
get
{
return _categoryName;
}
set
{
if (value == null)
throw new ArgumentNullException(nameof(value));
if (_categoryName == null || !string.Equals(_categoryName, value, StringComparison.OrdinalIgnoreCase))
{
_categoryName = value;
Close();
}
}
}
/// <summary>
/// Returns the description message for this performance counter
/// </summary>
public string CounterHelp
{
get
{
string currentCategoryName = _categoryName;
string currentMachineName = _machineName;
Initialize();
_helpMsg ??= PerformanceCounterLib.GetCounterHelp(currentMachineName, currentCategoryName, _counterName);
return _helpMsg;
}
}
/// <summary>
/// Sets/returns the performance counter name for this performance counter
/// </summary>
public string CounterName
{
get
{
return _counterName;
}
set
{
if (value == null)
throw new ArgumentNullException(nameof(value));
if (_counterName == null || !string.Equals(_counterName, value, StringComparison.OrdinalIgnoreCase))
{
_counterName = value;
Close();
}
}
}
/// <summary>
/// Sets/Returns the counter type for this performance counter
/// </summary>
public PerformanceCounterType CounterType
{
get
{
if (_counterType == -1)
{
string currentCategoryName = _categoryName;
string currentMachineName = _machineName;
// This is the same thing that NextSample does, except that it doesn't try to get the actual counter
// value. If we wanted the counter value, we would need to have an instance name.
Initialize();
using (CategorySample categorySample = PerformanceCounterLib.GetCategorySample(currentMachineName, currentCategoryName))
{
CounterDefinitionSample counterSample = categorySample.GetCounterDefinitionSample(_counterName);
_counterType = counterSample._counterType;
}
}
return (PerformanceCounterType)_counterType;
}
}
public PerformanceCounterInstanceLifetime InstanceLifetime
{
get { return _instanceLifetime; }
set
{
if (value > PerformanceCounterInstanceLifetime.Process || value < PerformanceCounterInstanceLifetime.Global)
throw new ArgumentOutOfRangeException(nameof(value));
if (_initialized)
throw new InvalidOperationException(SR.CantSetLifetimeAfterInitialized);
_instanceLifetime = value;
}
}
/// <summary>
/// Sets/returns an instance name for this performance counter
/// </summary>
public string InstanceName
{
get
{
return _instanceName;
}
set
{
if (value == null && _instanceName == null)
return;
if ((value == null && _instanceName != null) ||
(value != null && _instanceName == null) ||
!string.Equals(_instanceName, value, StringComparison.OrdinalIgnoreCase))
{
_instanceName = value;
Close();
}
}
}
/// <summary>
/// Returns true if counter is read only (system counter, foreign extensible counter or remote counter)
/// </summary>
public bool ReadOnly
{
get
{
return _isReadOnly;
}
set
{
if (value != _isReadOnly)
{
if (value == false)
{
VerifyWriteableCounterAllowed();
}
_isReadOnly = value;
Close();
}
}
}
/// <summary>
/// Set/returns the machine name for this performance counter
/// </summary>
public string MachineName
{
get
{
return _machineName;
}
set
{
if (!SyntaxCheck.CheckMachineName(value))
throw new ArgumentException(SR.Format(SR.InvalidProperty, nameof(MachineName), value), nameof(value));
if (_machineName != value)
{
_machineName = value;
Close();
}
}
}
/// <summary>
/// Directly accesses the raw value of this counter. If counter type is of a 32-bit size, it will truncate
/// the value given to 32 bits. This can be significantly more performant for scenarios where
/// the raw value is sufficient. Note that this only works for custom counters created using
/// this component, non-custom counters will throw an exception if this property is accessed.
/// </summary>
public long RawValue
{
get
{
if (ReadOnly)
{
//No need to initialize or Demand, since NextSample already does.
return NextSample().RawValue;
}
else
{
Initialize();
return _sharedCounter.Value;
}
}
set
{
if (ReadOnly)
ThrowReadOnly();
Initialize();
_sharedCounter.Value = value;
}
}
/// <summary>
/// </summary>
public void BeginInit()
{
Close();
}
/// <summary>
/// Frees all the resources allocated by this counter
/// </summary>
public void Close()
{
_helpMsg = null;
_oldSample = CounterSample.Empty;
_sharedCounter = null;
_initialized = false;
_counterType = -1;
}
/// <summary>
/// Frees all the resources allocated for all performance
/// counters, frees File Mapping used by extensible counters,
/// unloads dll's used to read counters.
/// </summary>
public static void CloseSharedResources()
{
PerformanceCounterLib.CloseAllLibraries();
}
/// <internalonly/>
/// <summary>
/// </summary>
protected override void Dispose(bool disposing)
{
// safe to call while finalizing or disposing
if (disposing)
{
//Dispose managed and unmanaged resources
Close();
}
base.Dispose(disposing);
}
/// <summary>
/// Decrements counter by one using an efficient atomic operation.
/// </summary>
public long Decrement()
{
if (ReadOnly)
ThrowReadOnly();
Initialize();
return _sharedCounter.Decrement();
}
/// <summary>
/// </summary>
public void EndInit()
{
Initialize();
}
/// <summary>
/// Increments the value of this counter. If counter type is of a 32-bit size, it'll truncate
/// the value given to 32 bits. This method uses a mutex to guarantee correctness of
/// the operation in case of multiple writers. This method should be used with caution because of the negative
/// impact on performance due to creation of the mutex.
/// </summary>
public long IncrementBy(long value)
{
if (_isReadOnly)
ThrowReadOnly();
Initialize();
return _sharedCounter.IncrementBy(value);
}
/// <summary>
/// Increments counter by one using an efficient atomic operation.
/// </summary>
public long Increment()
{
if (_isReadOnly)
ThrowReadOnly();
Initialize();
return _sharedCounter.Increment();
}
private static void ThrowReadOnly()
{
throw new InvalidOperationException(SR.ReadOnlyCounter);
}
private static void VerifyWriteableCounterAllowed()
{
if (EnvironmentHelpers.IsAppContainerProcess)
{
throw new NotSupportedException(SR.PCNotSupportedUnderAppContainer);
}
}
private void Initialize()
{
// Keep this method small so the JIT will inline it.
if (!_initialized && !DesignMode)
{
InitializeImpl();
}
}
/// <summary>
/// Initializes required resources
/// </summary>
private void InitializeImpl()
{
bool tookLock = false;
try
{
Monitor.Enter(InstanceLockObject, ref tookLock);
if (!_initialized)
{
string currentCategoryName = _categoryName;
string currentMachineName = _machineName;
if (currentCategoryName.Length == 0)
throw new InvalidOperationException(SR.CategoryNameMissing);
if (_counterName.Length == 0)
throw new InvalidOperationException(SR.CounterNameMissing);
if (ReadOnly)
{
if (!PerformanceCounterLib.CounterExists(currentMachineName, currentCategoryName, _counterName))
throw new InvalidOperationException(SR.Format(SR.CounterExists, currentCategoryName, _counterName));
PerformanceCounterCategoryType categoryType = PerformanceCounterLib.GetCategoryType(currentMachineName, currentCategoryName);
if (categoryType == PerformanceCounterCategoryType.MultiInstance)
{
if (string.IsNullOrEmpty(_instanceName))
throw new InvalidOperationException(SR.Format(SR.MultiInstanceOnly, currentCategoryName));
}
else if (categoryType == PerformanceCounterCategoryType.SingleInstance)
{
if (!string.IsNullOrEmpty(_instanceName))
throw new InvalidOperationException(SR.Format(SR.SingleInstanceOnly, currentCategoryName));
}
if (_instanceLifetime != PerformanceCounterInstanceLifetime.Global)
throw new InvalidOperationException(SR.InstanceLifetimeProcessonReadOnly);
_initialized = true;
}
else
{
if (currentMachineName != "." && !string.Equals(currentMachineName, PerformanceCounterLib.ComputerName, StringComparison.OrdinalIgnoreCase))
throw new InvalidOperationException(SR.RemoteWriting);
if (!PerformanceCounterLib.IsCustomCategory(currentMachineName, currentCategoryName))
throw new InvalidOperationException(SR.NotCustomCounter);
// check category type
PerformanceCounterCategoryType categoryType = PerformanceCounterLib.GetCategoryType(currentMachineName, currentCategoryName);
if (categoryType == PerformanceCounterCategoryType.MultiInstance)
{
if (string.IsNullOrEmpty(_instanceName))
throw new InvalidOperationException(SR.Format(SR.MultiInstanceOnly, currentCategoryName));
}
else if (categoryType == PerformanceCounterCategoryType.SingleInstance)
{
if (!string.IsNullOrEmpty(_instanceName))
throw new InvalidOperationException(SR.Format(SR.SingleInstanceOnly, currentCategoryName));
}
if (string.IsNullOrEmpty(_instanceName) && InstanceLifetime == PerformanceCounterInstanceLifetime.Process)
throw new InvalidOperationException(SR.InstanceLifetimeProcessforSingleInstance);
_sharedCounter = new SharedPerformanceCounter(currentCategoryName.ToLowerInvariant(), _counterName.ToLowerInvariant(), _instanceName.ToLowerInvariant(), _instanceLifetime);
_initialized = true;
}
}
}
finally
{
if (tookLock)
Monitor.Exit(InstanceLockObject);
}
}
// Will cause an update, raw value
/// <summary>
/// Obtains a counter sample and returns the raw value for it.
/// </summary>
public CounterSample NextSample()
{
string currentCategoryName = _categoryName;
string currentMachineName = _machineName;
Initialize();
using (CategorySample categorySample = PerformanceCounterLib.GetCategorySample(currentMachineName, currentCategoryName))
{
CounterDefinitionSample counterSample = categorySample.GetCounterDefinitionSample(_counterName);
_counterType = counterSample._counterType;
if (!categorySample._isMultiInstance)
{
if (!string.IsNullOrEmpty(_instanceName))
throw new InvalidOperationException(SR.Format(SR.InstanceNameProhibited, _instanceName));
return counterSample.GetSingleValue();
}
else
{
if (string.IsNullOrEmpty(_instanceName))
throw new InvalidOperationException(SR.InstanceNameRequired);
return counterSample.GetInstanceValue(_instanceName);
}
}
}
/// <summary>
/// Obtains a counter sample and returns the calculated value for it.
/// NOTE: For counters whose calculated value depend upon 2 counter reads,
/// the very first read will return 0.0.
/// </summary>
public float NextValue()
{
//No need to initialize or Demand, since NextSample already does.
CounterSample newSample = NextSample();
float retVal = CounterSample.Calculate(_oldSample, newSample);
_oldSample = newSample;
return retVal;
}
/// <summary>
/// Removes this counter instance from the shared memory
/// </summary>
public void RemoveInstance()
{
if (_isReadOnly)
throw new InvalidOperationException(SR.ReadOnlyRemoveInstance);
Initialize();
_sharedCounter.RemoveInstance(_instanceName.ToLowerInvariant(), _instanceLifetime);
}
}
}