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protocol DataService {
    var coreDataService:CoreDataService {
        get
    }
    var processQueue:DispatchQueue {
        get
    }
}

class AppDataService: DataService {
    
    var coreDataService: CoreDataService
    
    private(set) var processQueue = DispatchQueue(label: "DataServiceProcessQueue")
    
    init(coreDataService:CoreDataService) {
        self.coreDataService = coreDataService
    }
    
    static let sharedService = AppDataService(coreDataService:MainCoreDataService())
}