public EventHandlerNotFoundException(EntityBase entity, DomainEvent @event)
: base(GetErrorMessage(entity, @event))
{
}
void IEntity.ApplyEvent(DomainEvent @event)
{
ApplyEvent(@event);
}
private static string GetErrorMessage(EntityBase entity, DomainEvent @event)
{
return String.Format("Unable to locate an event handler for {0} on {1}", @event.GetType().FullName, entity.GetType().FullName);
}
protected virtual void ApplyEvent(DomainEvent @event)
{
try
{
var eventType = @event.GetType();
if(eventType.GetCustomAttribute<EventDoesNotMutateStateAttribute>() == null)
{
eventHandlers[eventType].Invoke(@event);
}
}
catch (TargetInvocationException ex)
{
throw new EventHandlerInvocationException(this, @event, ex);
}
catch (KeyNotFoundException)
{
throw new EventHandlerNotFoundException(this, @event);
}
}
protected virtual void RaiseEvent(DomainEvent @event)
{
ApplyEvent(@event);
SaveEvent(@event);
}
internal abstract void SaveEvent(DomainEvent @event);
public EventHandlerInvocationException(EntityBase entity, DomainEvent @event, TargetInvocationException ex)
: base(GetErrorMessage(entity, @event), ex.InnerException ?? ex)
{
}
private static string GetErrorMessage(EntityBase entity, DomainEvent @event)
{
return String.Format("An error occured while invoking event handler {0} on {1}", @event.GetType().FullName, entity.GetType().FullName);
}
public EventHandlerNotFoundException(EntityBase entity, DomainEvent @event)
: base(GetErrorMessage(entity, @event))
{
}
private static string GetErrorMessage(EntityBase entity, DomainEvent @event)
{
return(String.Format("Unable to locate an event handler for {0} on {1}", @event.GetType().FullName, entity.GetType().FullName));
}
