/// <summary>
/// Loads all Perfmon counters on the target host matching the given parameters.
/// </summary>
/// <param name="host">The host to check counters on.</param>
/// <param name="categoryName">The counter category.</param>
/// <param name="counterName">The name of the counter.</param>
/// <param name="unitOfMeasurement">The unit of measurement that this counter reports in. This is a piece of metadata we add in.</param>
/// <param name="instanceFilters">A collection of search terms to use to filter out instances that do not match.</param>
/// <returns>List of all matching Perfmon counters.</returns>
public static IList<PerfmonCounter> LoadInstancesForCounter(Host host, string categoryName, string counterName, string unitOfMeasurement, IList<string> instanceFilters)
{
IList<PerfmonCounter> counters = new List<PerfmonCounter>();
// Check if counter exists.
var counterExists = false;
try
{
counterExists = PerformanceCounterCategory.CounterExists(counterName, categoryName, host.Name);
}
catch (UnauthorizedAccessException ex)
{
Log.Error(String.Format("Error checking for existence of Perfmon counter '{0}' in category '{1}' on host '{2}': {3}",
counterName, categoryName, host.Name, ex.Message));
}
catch (Win32Exception ex)
{
Log.Error(String.Format("Could not communicate with Perfmon on target host '{0}': {1}", host.Name, ex.Message));
}
// If the requested counter does not exist, log it and bail out.
if (!counterExists)
{
Log.Debug(String.Format("Counter '{0}' in category '{1}' on host '{2}' does not exist.",
counterName, categoryName, host.Name));
return counters;
}
var category = new PerformanceCounterCategory(categoryName, host.Name);
// Perfmon has both "single-instance" and "multi-instance" counter types -- we need to handle both appropriately.
if (!IsMultiInstance(category))
{
// Just create it and add it to the list.
var counter = new PerfmonCounter(host, categoryName, counterName, null, unitOfMeasurement);
counters.Add(counter);
}
else
{
var instanceNames = new List<string>(category.GetInstanceNames());
// If we didn't specify any instance names to filter by, we just grab everything.
if (instanceFilters.Count == 0)
{
foreach (var instanceName in instanceNames)
{
var builder = new PerfmonCounterBuilder();
var counter = builder.CreateCounter(host)
.WithCategoryName(categoryName)
.WithCounterName(counterName)
.WithInstanceName(instanceName)
.WithUnit(unitOfMeasurement);
counters.Add(counter);
}
}
// If we did specify instance names to filter by, we loop over instance names, instantiating any counters that match our filters.
else
{
foreach (var instanceFilter in instanceFilters)
{
var matchingInstances = instanceNames.Where(instanceName => instanceName.Contains(instanceFilter));
foreach (var instanceName in matchingInstances)
{
var builder = new PerfmonCounterBuilder();
var counter = builder.CreateCounter(host)
.WithCategoryName(categoryName)
.WithCounterName(counterName)
.WithInstanceName(instanceName)
.WithUnit(unitOfMeasurement);
counters.Add(counter);
}
}
}
}
return counters;
}
/// <summary>
/// Loads all Perfmon counters on the target host matching the given parameters.
/// </summary>
/// <param name="host">The host to check counters on.</param>
/// <param name="categoryName">The counter category.</param>
/// <param name="counterName">The name of the counter.</param>
/// <param name="unitOfMeasurement">The unit of measurement that this counter reports in. This is a piece of metadata we add in.</param>
/// <param name="instanceFilters">A collection of search terms to use to filter out instances that do not match.</param>
/// <returns>List of all matching Perfmon counters.</returns>
public static IList <PerfmonCounter> LoadInstancesForCounter(Host host, string categoryName, string counterName, string unitOfMeasurement, IList <string> instanceFilters)
{
IList <PerfmonCounter> counters = new List <PerfmonCounter>();
// Check if counter exists.
var counterExists = false;
try
{
counterExists = PerformanceCounterCategory.CounterExists(counterName, categoryName, host.Name);
}
catch (UnauthorizedAccessException ex)
{
Log.Error(String.Format("Error checking for existence of Perfmon counter '{0}' in category '{1}' on host '{2}': {3}",
counterName, categoryName, host.Name, ex.Message));
}
catch (Win32Exception ex)
{
Log.Error(String.Format("Could not communicate with Perfmon on target host '{0}': {1}", host.Name, ex.Message));
}
// If the requested counter does not exist, log it and bail out.
if (!counterExists)
{
Log.Debug(String.Format("Counter '{0}' in category '{1}' on host '{2}' does not exist.",
counterName, categoryName, host.Name));
return(counters);
}
var category = new PerformanceCounterCategory(categoryName, host.Name);
// Perfmon has both "single-instance" and "multi-instance" counter types -- we need to handle both appropriately.
if (!IsMultiInstance(category))
{
// Just create it and add it to the list.
var counter = new PerfmonCounter(host, categoryName, counterName, null, unitOfMeasurement);
counters.Add(counter);
}
else
{
var instanceNames = new List <string>(category.GetInstanceNames());
// If we didn't specify any instance names to filter by, we just grab everything.
if (instanceFilters.Count == 0)
{
foreach (var instanceName in instanceNames)
{
var builder = new PerfmonCounterBuilder();
var counter = builder.CreateCounter(host)
.WithCategoryName(categoryName)
.WithCounterName(counterName)
.WithInstanceName(instanceName)
.WithUnit(unitOfMeasurement);
counters.Add(counter);
}
}
// If we did specify instance names to filter by, we loop over instance names, instantiating any counters that match our filters.
else
{
foreach (var instanceFilter in instanceFilters)
{
var matchingInstances = instanceNames.Where(instanceName => instanceName.Contains(instanceFilter));
foreach (var instanceName in matchingInstances)
{
var builder = new PerfmonCounterBuilder();
var counter = builder.CreateCounter(host)
.WithCategoryName(categoryName)
.WithCounterName(counterName)
.WithInstanceName(instanceName)
.WithUnit(unitOfMeasurement);
counters.Add(counter);
}
}
}
}
return(counters);
}
