/// <summary>
/// Get all the event listeners for the given event type.
/// </summary>
/// <param name="services">Current service provider.</param>
/// <param name="modules">Active modules for the current guild..</param>
/// <returns>The event listeners.</returns>
private static IEnumerable <EventHandler> GetHandlers <TEvent>(
IServiceProvider services,
IReadOnlyCollection <string> modules = null)
where TEvent : IEvent
{
var checkEnabledModule = modules != null;
foreach (var handler in services.GetServices <IEventListener>())
{
var events = RegisteredEventListener.FromType(handler.GetType());
foreach (var eventHandler in events)
{
if (eventHandler.EventType != typeof(TEvent) ||
checkEnabledModule &&
eventHandler.Module != null &&
!modules.Contains(eventHandler.Module))
{
continue;
}
yield return(new EventHandler(handler, eventHandler));
}
}
}
