public IPipeline RegisterObserver(IPipelineObserver pipelineObserver)
{
Observers.Add(pipelineObserver);
var observerInterfaces = pipelineObserver.GetType().GetInterfaces();
var implementedEvents = from i in observerInterfaces
where
i.IsAssignableTo(typeof(IPipelineObserver <>))
&&
i.IsGenericType
&&
i.Name.StartsWith("IPipelineObserver`")
select i;
foreach (var @event in implementedEvents)
{
var pipelineEventType = @event.GetGenericArguments()[0];
if (!ObservedEvents.TryGetValue(pipelineEventType, out _))
{
ObservedEvents.Add(pipelineEventType, new List <ObserverMethodInfoPair>());
}
var methodInfo = pipelineObserver.GetType().GetMethod("Execute", new[] { pipelineEventType });
ObservedEvents[pipelineEventType].Add(new ObserverMethodInfoPair(pipelineObserver, methodInfo));
}
return(this);
}
public ObserverMethodInvoker(IPipelineObserver pipelineObserver, Type pipelineEventType)
{
_pipelineObserver = pipelineObserver;
var pipelineObserverType = pipelineObserver.GetType();
var dynamicMethod = new DynamicMethod(string.Empty,
typeof(void), new[] { typeof(IPipelineObserver), typeof(IPipelineEvent) },
typeof(IPipelineEvent).Module);
var il = dynamicMethod.GetILGenerator();
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ldarg_1);
var methodInfo = pipelineObserverType.GetMethod("Execute", new[] { pipelineEventType });
il.EmitCall(OpCodes.Callvirt, methodInfo, null);
il.Emit(OpCodes.Ret);
_invoker = (InvokeHandler)dynamicMethod.CreateDelegate(typeof(InvokeHandler));
}
public string GetObserverTypeName() => _pipelineObserver.GetType().FullName;