public DynamicInvoker(string diagnosticSourceAssemblyName, Type diagnosticSourceType, Type diagnosticListenerType)
{
Validate.NotNull(diagnosticSourceAssemblyName, nameof(diagnosticSourceAssemblyName));
_diagnosticSourceAssemblyName = diagnosticSourceAssemblyName;
_diagnosticSourceInvoker = new DynamicInvoker_DiagnosticSource(diagnosticSourceType);
_diagnosticListenerInvoker = new DynamicInvoker_DiagnosticListener(diagnosticListenerType);
_invalidationListeners = new DynamicInvokerInvalidationListenersCollection(nameof(DynamicInvoker), this);
_isValid = 1;
}
public static DiagnosticSourceStub CreateNewSource(string diagnosticSourceName)
{
Validate.NotNull(diagnosticSourceName, nameof(diagnosticSourceName));
DynamicInvoker_DiagnosticListener invoker = null;
try
{
invoker = DynamicInvoker.Current.DiagnosticListener;
object diagnosticListenerInstance = invoker.Call.Ctor(diagnosticSourceName);
return(DiagnosticSourceStub.Wrap(diagnosticListenerInstance));
}
catch (Exception ex)
{
throw LogAndRethrowStubInvocationError(ex, invoker?.GetType(), nameof(DynamicInvoker_DiagnosticListener.StubbedApis.Ctor), invoker?.TargetType);
}
}
internal static bool TryWrap(object diagnosticListenerInstance, out DiagnosticListenerStub diagnosticListenerStub)
{
if (diagnosticListenerInstance == null)
{
diagnosticListenerStub = NoOpSingeltons.DiagnosticListenerStub;
return(true);
}
DynamicInvoker_DiagnosticListener invoker = DynamicInvoker.Current.DiagnosticListener;
if (invoker != null && invoker.TryGetInvokerHandleForInstance(diagnosticListenerInstance, out DynamicInvokerHandle <DynamicInvoker_DiagnosticListener> handle))
{
diagnosticListenerStub = new DiagnosticListenerStub(diagnosticListenerInstance, handle);
return(true);
}
else
{
diagnosticListenerStub = NoOpSingeltons.DiagnosticListenerStub;
return(false);
}
}
/// <summary>
/// In addition to forwarding all calls from the underlying Diagnostic Listener to the specified <c>eventObserver</c>,
/// the <c>eventObserver</c>'s <c>OnCompleted()</c> handler will be called if the DiagnosticSource-assembly is unloaded
/// or dynamically swapped for another version. This allows subscribers to know that no more events are coming.
/// To handle such case, it is recommended to give up on the existing subscription and to schedule a from-scratch
/// re-subscription on a timer after a short time period. Such delay ensures that the new assembly version is loaded by then.
/// Notably, a few events will be lost. This is an explicit design decision in the context of the fact that assembly
/// unloads are extremely rare.
/// If the IDisposable returned by this method is disposed, then the above-described notification will not be delivered.
/// </summary>
/// <remarks>
/// Consider using <c>Datadog.Util.ObserverAdapter</c> in shared sources to conveniently create observers suitable for this API.
/// </remarks>
public IDisposable SubscribeToEvents(IObserver <KeyValuePair <string, object> > eventObserver, Func <string, object, object, bool> isEventEnabledFilter)
{
if (_diagnosticListenerInstance == null)
{
return(NoOpSingeltons.EventSubscription);
}
Validate.NotNull(eventObserver, nameof(eventObserver));
// isEventEnabledFilter may be null
DynamicInvoker_DiagnosticListener invoker = null;
try
{
invoker = _dynamicInvokerHandle.GetInvoker();
IDisposable eventsSubscription = invoker.Call.Subscribe(_diagnosticListenerInstance, eventObserver, isEventEnabledFilter);
Action <DiagnosticSourceAssembly.IDynamicInvoker> invokerInvalidatedAction = (invkr) =>
{
// DiagnosticListener does NOT call OnCompleted when the subscription is disposed. So we DO need to call it here:
eventObserver.OnCompleted();
eventsSubscription.Dispose();
};
DynamicInvokerHandle <DynamicInvoker_DiagnosticListener> invokerHandle = _dynamicInvokerHandle;
IDisposable invokerInvalidatedActionSub = invokerHandle.SubscribeInvalidatedListener(invokerInvalidatedAction);
IDisposable eventsSubscriptionWrapper = new Disposables.Action(() =>
{
invokerInvalidatedActionSub.Dispose();
eventsSubscription.Dispose();
});
return(eventsSubscriptionWrapper);
}
catch (Exception ex)
{
throw LogAndRethrowStubInvocationError(ex, nameof(DynamicInvoker_DiagnosticListener.StubbedApis.Subscribe), isStaticApi: false, invoker?.TargetType);
}
}
/// <summary>
/// In addition to forwarding all calls from the underlying Diagnostic Source collection to the specified <c>diagnosticSourcesObserver</c>,
/// the <c>diagnosticSourcesObserver</c>'s <c>OnCompleted()</c> handler will be called if the DiagnosticSource-assembly is unloaded
/// or dynamically swapped for another version. This allows subscribers to know that no more events are coming.
/// To handle such case, it is recommended to give up on the existing subscription and to schedule a from-scratch
/// re-subscription on a timer after a short time period. Such delay ensures that the new assembly version is loaded by then.
/// Notably, a few events will be lost. This is an explicit design decision in the context of the fact that assembly
/// unloads are extremely rare.
/// If the IDisposable returned by this method is disposed, then the above-described notification will not be delivered.
/// </summary>
/// <remarks>Consider using <c>Datadog.Util.ObserverAdapter</c> in shared sources to conveniently create observers suitable for this API.</remarks>
public static IDisposable SubscribeToAllSources(IObserver <DiagnosticListenerStub> diagnosticSourcesObserver)
{
Validate.NotNull(diagnosticSourcesObserver, nameof(diagnosticSourcesObserver));
DynamicInvoker_DiagnosticListener invoker = null;
try
{
invoker = DynamicInvoker.Current.DiagnosticListener;
IObservable <object> allSourcesObservable = invoker.Call.get_AllListeners();
IObserver <object> observerAdapter = new DiagnosticListenerToStubObserverAdapter(diagnosticSourcesObserver);
IDisposable dsSubscription = allSourcesObservable.Subscribe(observerAdapter);
Action <DiagnosticSourceAssembly.IDynamicInvoker> invokerInvalidatedAction = (invkr) =>
{
// DiagnosticListener calls OnCompleted when the subscription is disposed. So we do NOT need to call it here:
// observerAdapter.OnCompleted();
dsSubscription.Dispose();
};
DynamicInvokerHandle <DynamicInvoker_DiagnosticListener> invokerHandle = invoker.Handle;
IDisposable invokerInvalidatedActionSub = invokerHandle.SubscribeInvalidatedListener(invokerInvalidatedAction);
IDisposable dsSubscriptionWrapper = new Disposables.Action(() =>
{
invokerInvalidatedActionSub.Dispose();
dsSubscription.Dispose();
});
return(dsSubscriptionWrapper);
}
catch (Exception ex)
{
throw LogAndRethrowStubInvocationError(ex, invoker?.GetType(), nameof(DynamicInvoker_DiagnosticListener.StubbedApis.get_AllListeners), invoker?.TargetType);
}
}
public static DiagnosticListenerStub Wrap(object diagnosticListenerInstance)
{
if (diagnosticListenerInstance == null)
{
return(NoOpSingeltons.DiagnosticListenerStub);
}
DynamicInvoker_DiagnosticListener invoker = null;
try
{
invoker = DynamicInvoker.Current.DiagnosticListener;
DynamicInvokerHandle <DynamicInvoker_DiagnosticListener> handle = invoker.GetInvokerHandleForInstance(diagnosticListenerInstance);
return(new DiagnosticListenerStub(diagnosticListenerInstance, handle));
}
catch (Exception ex)
{
throw ErrorUtil.LogAndRethrowStubInvocationError(ErrorUtil.CannotCreateStubMsg,
ex,
typeof(DynamicInvoker_DiagnosticListener),
invoker?.TargetType,
diagnosticListenerInstance);
}
}
internal StubbedApis(DynamicInvoker_DiagnosticListener thisInvoker)
{
_thisInvoker = thisInvoker;
_cashedDelegates = new CashedDelegates();
}
