Problem of Initialize and Make Current User (Custom Current User Getter) Available in All Layers and Projects inside SharePoint Solution

The case:
I am Developing a SharePoint Project I am Using External Database With Hibernate As Persistence Layer I Have Custom User (External Database) at Common Projects This Current User Must Available at all Layer and must Filled before Any Request Problem:
What I need is to find a way to fill this object (Current User) before Any Request so it cans Accessible from all layers without any effort like the Following MYContext.Current.CurrentUser
What I make:
I enable Session state For MOSS 2007 I Customize the Global.asax for SharePoint using the default Session_Start(object sender)Like the following Session["CurrentUSer"]=MyCustomeUserManager.GetUserBySPID();
I make the default Application_BeginRequest(object sender, EventArgs e)like the following : Thread.CurrentContext.SetProperty for set the Current User
Or Use the
Th ...