private Dictionary <Type, ListenerInfo> CreateListenerInfos(Type eventType, IEnumerable <IEventListener> allListeners)
{
Dictionary <Type, ListenerInfo> result = new Dictionary <Type, ListenerInfo>();
foreach (var listener in allListeners)
{
Type listenerType = listener.GetType();
var baseType = listener.GetType().GetInterface(typeof(IEventListener <>).FullName);
if (baseType == null)
{
result[listenerType] = new ListenerInfo()
{
ListenerType = listenerType,
ListenerEventType = null,
CanTrigger = false
};
continue;
}
Type argType = baseType.GetGenericArguments()[0];
bool canTrigger = argType.IsAssignableFrom(eventType);
result[listenerType] = new ListenerInfo()
{
ListenerType = listenerType,
CanTrigger = canTrigger,
ListenerEventType = argType
};;
}
return(result);
}
/// <summary>
/// Create Listener MethodInvoker with Emit
/// </summary>
/// <param name="listenerType"></param>
/// <param name="info"></param>
/// <returns></returns>
private Action <IEventListener, object> CreateListenerTrigger(Type listenerType, ListenerInfo info)
{
DynamicMethod method = new DynamicMethod("TriggerMethod", null, new Type[] { typeof(IEventListener), typeof(object) });
var il = method.GetILGenerator();
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Castclass, listenerType);
il.Emit(OpCodes.Ldarg_1);
il.Emit(OpCodes.Castclass, info.ListenerEventType);
il.Emit(OpCodes.Callvirt, listenerType.GetMethod("Handle", new Type[] { info.ListenerEventType }));
il.Emit(OpCodes.Ret);
return((Action <IEventListener, Object>)method.CreateDelegate(typeof(Action <IEventListener, Object>)));
}