/// <summary>
/// Intializes required resources
/// </summary>
private void InitializeImpl()
{
var tookLock = false;
try
{
Monitor.Enter(InstanceLockObject, ref tookLock);
if (!_initialized)
{
if (CategoryName == string.Empty)
{
throw new InvalidOperationException(SR.Format(SR.CategoryNameMissing));
}
if (CounterName == string.Empty)
{
throw new InvalidOperationException(SR.Format(SR.CounterNameMissing));
}
if (!PerformanceCounterLib.CounterExists(CategoryName, CounterName))
{
throw new InvalidOperationException(SR.Format(SR.CounterExists, CategoryName, CounterName));
}
var categoryType = PerformanceCounterLib.GetCategoryType(CategoryName);
if (categoryType == PerformanceCounterCategoryType.MultiInstance)
{
if (string.IsNullOrEmpty(InstanceName))
{
throw new InvalidOperationException(SR.Format(SR.MultiInstanceOnly, CategoryName));
}
}
else if (categoryType == PerformanceCounterCategoryType.SingleInstance)
{
if (!string.IsNullOrEmpty(InstanceName))
{
throw new InvalidOperationException(SR.Format(SR.SingleInstanceOnly, CategoryName));
}
}
if (_instanceLifetime != PerformanceCounterInstanceLifetime.Global)
{
throw new InvalidOperationException(SR.Format(SR.InstanceLifetimeProcessonReadOnly));
}
_initialized = true;
}
}
finally
{
if (tookLock)
{
Monitor.Exit(InstanceLockObject);
}
}
}
/// <summary>
/// Returns true if the counter is registered for this category
/// </summary>
public bool CounterExists(string counterName)
{
if (counterName == null)
{
throw new ArgumentNullException(nameof(counterName));
}
if (_categoryName == null)
{
throw new InvalidOperationException(SR.Format(SR.CategoryNameNotSet));
}
return(PerformanceCounterLib.CounterExists(_categoryName, counterName));
}
/// <summary>
/// Returns true if the counter is registered for this category on a particular machine.
/// </summary>
public static bool CounterExists(string counterName, string categoryName)
{
if (counterName == null)
{
throw new ArgumentNullException(nameof(counterName));
}
if (categoryName == null)
{
throw new ArgumentNullException(nameof(categoryName));
}
if (categoryName.Length == 0)
{
throw new ArgumentException(SR.Format(SR.InvalidParameter, nameof(categoryName), categoryName), nameof(categoryName));
}
return(PerformanceCounterLib.CounterExists(categoryName, counterName));
}