/// <summary>
/// Applies an event to the instance augmenting the current version
/// for each event applied
/// </summary>
/// <param name="domainEvent">Event to apply</param>
/// <param name="isNew">True if the event is new to the event stream; otherwise false</param>
public void ApplyEvent(DomainEvent domainEvent, bool isNew = true)
{
Version++;
if (isNew)
{
domainEvent.Sequence = Version;
domainEvent.EventDate = DateTime.UtcNow;
}
// Call the apply method on the domain model instance
if (!(domainEvent is DomainEntityEvent))
{
ApplyEventToSelf(domainEvent);
}
else
{
ApplyEventToEntities(domainEvent as DomainEntityEvent);
}
// Save the event for persistance if it's new
if (isNew)
{
_appliedEvents.Add(domainEvent);
}
}
/// <summary>
/// Publishes events to all event handlers
/// </summary>
/// <param name="domainEvent">Domain event instance</param>
public void PublishEvent(DomainEvent domainEvent)
{
var domainEventType = domainEvent.GetType();
var handlerType = typeof (IHandleDomainEvents<>);
var handlers = _dependencyResolver.ResolveAll(handlerType.MakeGenericType(domainEventType));
//TODO Order by some index
foreach (var handler in handlers)
{
handler.AsDynamic().Handle(domainEvent);
}
}
private void ApplyMethodWithCaching(object instanceToApply, DomainEvent eventToApply, Dictionary<string, MethodInfo> cache)
{
try
{
var eventType = eventToApply.GetType();
var localKey = string.Format("{0},{1}", GetType().FullName, eventType);
MethodInfo method;
// Check of the handler (method info) for this event has been cached
if (cache.ContainsKey(localKey))
{
method = cache[localKey];
}
else
{
// Get the convention-based handler
method = instanceToApply.GetAppliedEventMethodNamed(eventToApply.GetEventMethodName(), eventType);
cache.Add(localKey, method);
}
// Call the handler if it exists; otherwise dynamically call "Apply."
if (method != null)
{
method.Invoke(instanceToApply, new object[] { eventToApply });
}
else
{
instanceToApply.AsDynamic().Apply(eventToApply);
}
}
catch (Exception)
{
// The entity has no internal handler for the event. No
// need to trow an error.
}
}
/// <summary>
/// Applies a domain event to the current instance
/// </summary>
/// <param name="domainEvent">Event to apply</param>
private void ApplyEventToSelf(DomainEvent domainEvent)
{
ApplyMethodWithCaching(this, domainEvent, CachedLocalMethods);
}
protected void ApplyEvent(DomainEvent domainEvent)
{
Parent.ApplyEvent(domainEvent);
}
/// <summary>
/// Publishes a single event
/// </summary>
/// <param name="domainEvent">Event to publish</param>
public void PublishEvent(DomainEvent domainEvent)
{
PublishEvents(new []{domainEvent});
}
