/// <summary>
/// Initialize perf counter instance based on shard map name
/// </summary>
/// <param name="shardMapName"></param>
public PerfCounterInstance(string shardMapName)
{
#if NETFRAMEWORK
_initialized = false;
_instanceName = string.Concat(Process.GetCurrentProcess().Id.ToString(), "-", shardMapName);
try
{
// check if caller has permissions to create performance counters.
if (!PerfCounterInstance.HasCreatePerformanceCounterPermissions())
{
// Trace out warning and continue
Tracer.TraceWarning(TraceSourceConstants.ComponentNames.PerfCounter,
"create",
"User does not have permissions to create performance counters, no performance data will be collected.");
}
else
{
// check if PerformanceCounterCategory exists
if (!PerformanceCounterCategory.Exists(PerformanceCounters.ShardManagementPerformanceCounterCategory))
{
// We are not creating performance counter category here as per recommendation in documentation, copying note from
// https://msdn.microsoft.com/en-us/library/sb32hxtc(v=vs.110).aspx
// It is strongly recommended that new performance counter categories be created
// during the installation of the application, not during the execution of the application.
// This allows time for the operating system to refresh its list of registered performance counter categories.
// If the list has not been refreshed, the attempt to use the category will fail.
// Trace out warning and continue
Tracer.TraceWarning(TraceSourceConstants.ComponentNames.PerfCounter,
"create",
"Performance counter category {0} does not exist, no performance data will be collected.",
PerformanceCounters.ShardManagementPerformanceCounterCategory);
}
else
{
// Check if specific instance exists
if (PerformanceCounterCategory.InstanceExists(_instanceName,
PerformanceCounters.ShardManagementPerformanceCounterCategory))
{
// As performance counters are created with Process lifetime and instance name is unique (PID + shard map name),
// this should never happen. Trace out error and silently continue.
Tracer.TraceWarning(TraceSourceConstants.ComponentNames.PerfCounter,
"create",
"Performance counter instance {0} already exists, no performance data will be collected.",
_instanceName);
}
else
{
// now initialize all counters for this instance
_counters = new Dictionary <PerformanceCounterName, PerformanceCounterWrapper>();
foreach (PerfCounterCreationData d in PerfCounterInstance.counterList)
{
_counters.Add(d.CounterName,
new PerformanceCounterWrapper(
PerformanceCounters.ShardManagementPerformanceCounterCategory, _instanceName,
d.CounterDisplayName));
}
// check that atleast one performance counter was created, so that we can remove instance as part of Dispose()
_initialized = _counters.Any(c => c.Value._isValid = true);
}
}
}
}
catch (Exception e)
{
// Note: If any of the initialization calls throws, log the exception and silently continue.
// No perf data will be collected in this case.
// All other non-static code paths access PerformanceCounter and PerformanceCounterCategory
// objects only if _initialized is set to true.
Tracer.TraceWarning(TraceSourceConstants.ComponentNames.PerfCounter,
"PerfCounterInstance..ctor",
"Exception caught while creating performance counter instance, no performance data will be collected. Exception: {0}",
e.ToString());
}
#endif
}
/// <summary>
/// Create shard management performance counter category and counters
/// </summary>
public static void CreatePerformanceCategoryAndCounters()
{
PerfCounterInstance.CreatePerformanceCategoryAndCounters();
}