public static DomainContext GetBlogContext()
{
var dataContext = new Entities();
var workspace = GetDomainWorkspace(dataContext);
var persistedEventBus = GetPersistedEventBus();
var messageBus = GetEarlyEventBus(dataContext, workspace, persistedEventBus);
var context = new DomainContext(workspace,messageBus);
return context;
}
private static MessageBus GetEarlyEventBus(Entities dataContext, IWorkspace workspace, MessageBus persistedEventBus)
{
var messageBus = new MessageBus();
messageBus
.AsObservable<IDomainEvent>()
.Do(e =>
workspace.Committing += (s, ea) =>
{
ObjectStateEntry entry;
if (dataContext.ObjectStateManager.TryGetObjectStateEntry(e.Sender, out entry))
{
//resend the same event after commit
persistedEventBus.Send(e);
}
})
.Subscribe();
return messageBus;
}
public static IWorkspace GetDomainWorkspace(Entities context)
{
Func<Type, object> selector = t =>
{
if (t == typeof(MyBlog.Domain.Entities.Post))
return context.Posts;
if (t == typeof(MyBlog.Domain.Entities.Comment))
return context.Comments;
if (t == typeof(MyBlog.Domain.Entities.Category))
return context.Categories;
return null;
};
return new EF4Workspace(context,selector);
}