public void ObserveEvents()
{
var methodsWithAttributes =
from methodInfo in _eventProcessor.GetType().GetMethodsRecursive(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic)
let observeEventAttributes = methodInfo.GetCustomAttributes <ObserveEventAttribute>(true).ToArray()
where observeEventAttributes.Length > 0
select new { methodInfo, observeEventAttributes };
foreach (var methodWithAttributes in methodsWithAttributes)
{
ObserveEventAttribute[] observeEventAttributes = methodWithAttributes.observeEventAttributes;
MethodInfo method = methodWithAttributes.methodInfo;
if (observeEventAttributes.Length == 1)
{
ObserveEventAttribute observeEventAttribute = observeEventAttributes[0];
EnsureObserveEventSignatureCorrect(method, observeEventAttribute.EventType);
var eventObservable = CreateEventObservable(observeEventAttribute);
var observeDelegate = CreateEventObserverDelegate(method, observeEventAttribute.EventType);
ObserveEvent(eventObservable, observeDelegate);
}
else
{
var baseEventType = GetBaseEventType(method, observeEventAttributes);
EnsureObserveEventSignatureCorrect(method, baseEventType);
var eventObservable = CreateEventObservable(baseEventType, observeEventAttributes);
var observeDelegate = CreateEventObserverDelegate(method, baseEventType);
ObserveEvent(eventObservable, observeDelegate);
}
}
}
// gets a merged IEventObservable<TEvent, TContext, TModel> for all events in the given attributes, the merged streams TEvent is of baseEventType
private object CreateEventObservable(Type baseEventType, ObserveEventAttribute[] observeEventAttributes)
{
var eventObservableType = typeof(IEventObservable <, ,>).MakeGenericType(new Type[] { baseEventType, typeof(IEventContext), typeof(TModel) });
var eventObservables = (IList)typeof(List <>)
.MakeGenericType(eventObservableType)
.GetConstructor(new Type[] {})
.Invoke(null);
for (int i = 0; i < observeEventAttributes.Length; i++)
{
ObserveEventAttribute observeEventAttribute = observeEventAttributes[i];
dynamic eventObservable = CreateEventObservable(observeEventAttribute);
eventObservables.Add(eventObservable);
}
MethodInfo closedEventObservableMergeMethod = ObservableMergeMethodInfo.MakeGenericMethod(new Type[] { baseEventType, typeof(IEventContext), typeof(TModel) });
return(closedEventObservableMergeMethod.Invoke(null, new object[] { eventObservables }));
}
// gets an IEventObservable<TEvent, TContext, TModel> for the details in the given attribute
private object CreateEventObservable(ObserveEventAttribute observeEventAttribute)
{
var getEventObservableMethod = GetEventObservableMethodInfo.MakeGenericMethod(observeEventAttribute.EventType);
return(getEventObservableMethod.Invoke(_router, new object[] { observeEventAttribute.Stage }));
}