ProcessingType is a context of application. One ProcessingType can't see data from another ProcessingType. Services run inside one ProcessingType scope behave differently from services run in another scope.

This class is meant to provide access to some scope of data inside context of application to the user. We don't want to pass all ProcessingType's data to every service because it would complicate testing of services and would broke isolation between areas of application. Due to that, this class is a Functor (to be precise BiFunctor but more on that below) which allows to transform the scope of Data.

Sometimes it is necessary to have access also to combination of data across all ProcessingTypes. Due to that this class is a BiFunctor which second value named as CombinedData

This class caches Data and CombinedData wrapped in ProcessingTypeDataState to avoid computations of transformations during each lookup to Data/CombinedData. It behave similar to Observable where given transformed ProcessingTypeDataProvider check its parent if ProcessingTypeDataState.stateIdentity changed.

ProcessingType is associated with Category e.g. Fraud Detection, Marketing. Given user has access to certain categories see LoggedUser.can. Due to that, during each access to Data, user is authorized if he/she has access to category.