Code compatibility

DD4T 2.*

Factories	DD4T 2 has factories that give access to generic types (IPage, IComponentPresentation, etc). This is indispensible, so we must include this in our facade.
ViewModels (factory + attributes)	The entire ViewModel layer must be included in the facade. That - combined with the fact that the PageFactory / ComponentPresentationFactory are also in the facade - will guarantee that the DD4T ViewModels will continue to work.
Caching	The ICacheAgent interface must still be supported as well as the DefaultCacheAgent and NullCacheAgent implementations. This should not be a problem. Should have: support for JMS listener approach (unless DXA 2 contains a better alternative for cache invalidation).
Configuration	The IDD4TConfiguration interface must be supported. The exposed properties (settings) must be mapped to the new settings in DXA 2.
DependencyMappings	This gives access to DI-managed objects from a non-managed context. Nice to have.
Link resolving	ILinkResolver and DefaultLinkResolver must be supported.
Rich text resolving	IRichTextResolver and DefaultRichTextResolver must be supported.
Publication resolving	IPublicationResolver and DefaultPublicationResolver must be supported.
TcmUri	Should be supported in the facade as a wrapper around whatever DXA will be using.

Interface	Method	Explanation	Priority
IPageFactory
	IPage FindPage(string url);	Finds IPage (generic type) for given URL	M
	IPage GetPage(string tcmUri);	Retrieves IPage (generic type) for given TCM URI	M
	string FindPageContent(string url)	Retrieves raw content for page as string for given URL	S
	string GetPageContent(string tcmUri)	Retrieves raw content for page as string for given TCM URI	S
	IPage GetIPageObject(string pageStringContent)	Converts raw content (string) to IPage	S
	DateTime GetLastPublishedDateByUrl(string url)	Gets last publish date by URL (for custom caching purposes)	S
	DateTime GetLastPublishedDateByUri(string uri)	Gets last publish date by TCM URI (for custom caching purposes)	S
	string[] GetAllPublishedPageUrls(string[] includeExtensions, string[] pathStarts)	Gets all published page URLs	C