private static bool PerformInitialization()
{
// We will now try to load the "right" version of System.Diagnostics.DiagnosticSource.dll
// (henceforth we'll use the abbreviation DiagnosticSource.dll).
// Here, "right" is defined as: if the app is using DiagnosticSource.dll we prefer to load that version.
// Otherwise we prefer the version included with this library, which should be a relatively recent one.
Assembly diagnosticSourceAssembly = LoadDiagnosticSourceAssembly();
if (diagnosticSourceAssembly == null)
{
return(false);
}
Type activityType = diagnosticSourceAssembly.GetType(ActivityType_FullName, throwOnError: true);
if (activityType == null)
{
return(false);
}
var supportedFeatures = new SupportedFeatures()
{
};
s_invoker = new DynamicInvokerOld(supportedFeatures, activityType, null, null);
return(true);
}
public void AddTag(string key, string value)
{
if (_activityInstance == null)
{
return;
}
DynamicInvokerOld invoker = DynamicLoader.Invoker;
if (invoker.SupportedFeatures.FeatureSet_5000 || invoker.SupportedFeatures.FeatureSet_4020)
{
invoker.Activity.AddTag(_activityInstance, key, value);
}
else
{
string errMsg = FormatNotSupportedErrorMessage($"{nameof(AddTag)}(..)", "4020", invoker);
throw new NotSupportedException(errMsg);
}
}
public string GetBaggageItem(string key)
{
if (_activityInstance == null)
{
return(null);
}
DynamicInvokerOld invoker = DynamicLoader.Invoker;
if (invoker.SupportedFeatures.FeatureSet_5000 || invoker.SupportedFeatures.FeatureSet_4020)
{
return(invoker.Activity.GetBaggageItem(_activityInstance, key));
}
else
{
string errMsg = FormatNotSupportedErrorMessage($"{nameof(GetBaggageItem)}(..)", "4020", invoker);
throw new NotSupportedException(errMsg);
}
}
private static string FormatNotSupportedErrorMessage(string apiName, string minRequiredFeatureSet, DynamicInvokerOld invoker)
{
string errMsg = $"{nameof(ActivityStub)}.{apiName} is not supported."
+ $" Status: {{{nameof(DynamicLoader)}.{nameof(DynamicLoader.InitializationState)}={DynamicLoader.InitializationState.ToString()};"
+ $" MinRequiredFeatureSet={minRequiredFeatureSet};"
+ $" SupportedFeatureSets={invoker.SupportedFeatures.FormatFeatureSetSupportList()}}}";
return(errMsg);
}
public static ActivityStub StartNewActivity(string operationName,
ActivityKindStub activityKind,
ActivityContextStub parentContext,
IEnumerable <KeyValuePair <string, string> > tags)
{
if (!DynamicLoader.EnsureInitialized())
{
return(NoOpSingeltons.ActivityStub);
}
DynamicInvokerOld invoker = DynamicLoader.Invoker;
if (invoker.SupportedFeatures.FeatureSet_5000)
{
object activityInstance = invoker.ActivitySource.StartActivity(operationName, activityKind, parentContext, tags);
ActivityStub activityStub = Wrap(activityInstance);
return(activityStub);
}
else if (invoker.SupportedFeatures.FeatureSet_4020)
{
object activityInstance = invoker.Activity.Ctor(operationName);
ActivityStub activityStub = Wrap(activityInstance);
// Older Activity versions do not have a concept of Trace and Span. Instead they have an Id and a RoodId.
// We will generate a parent Id to match the logic employed by older activities so that RoodId acts as a TraceId.
// See:
// https://github.com/dotnet/runtime/blob/7666224cfcfb4349da28f9f7fb1de931528ef208/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Activity.cs#L39
// https://github.com/dotnet/runtime/blob/7666224cfcfb4349da28f9f7fb1de931528ef208/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Activity.cs#L358
// https://github.com/dotnet/runtime/blob/7666224cfcfb4349da28f9f7fb1de931528ef208/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Activity.cs#L405
// https://github.com/dotnet/corefx/blob/master/src/System.Diagnostics.DiagnosticSource/src/ActivityUserGuide.md#id-format
if (parentContext.IsNotInitialized())
{
string parentId = "|" + parentContext.TraceIdHexString + "." + parentContext.SpanIdHexString + "_";
invoker.Activity.SetParentId(activityInstance, parentId);
}
// Internal is the default. For internal, we avoid creating supplemantal data.
if (activityKind != ActivityKindStub.Internal)
{
SupplementalActivityData supplementalData = activityStub.GetOrCreateSupplementalData();
supplementalData.ActivityKind = activityKind;
}
if (tags != null)
{
foreach (KeyValuePair <string, string> tag in tags)
{
invoker.Activity.AddTag(activityInstance, tag.Key, tag.Value);
}
}
object diagnosticSource = invoker.DiagnosticListener.DefaultDiagnosticSource;
invoker.DiagnosticListener.StartActivity(activityInstance, activityInstance);
return(activityStub);
}
else
{
string errMsg = FormatNotSupportedErrorMessage($"{nameof(StartNewActivity)}(..)", "4020", invoker);
throw new NotSupportedException(errMsg);
}
}
