Reflective Composition: the declarative composition of roles to unify objects, roles, and aspects [poster session]

As bases for object-orientation, both class-based and prototype-based organization have limitations. We argue that roles have significant benefits as a foundation for organizing objects. We further argue that these benefits can be realised most flexibly using logic meta-programming. Additional benefits from this approach are to reduce redundancy and subsume aspects

Distribution of the Object Oriented Databases. A Viewpoint of the MVDB Model's Methodology and Architecture

In databases, much work has been done towards extending models with advanced tools such as view technology, schema evolution support, multiple classification, role modeling and viewpoints. Over the past years, most of the research dealing with the object multiple representation and evolution has proposed to enrich the monolithic vision of the classical object approach in which an object belongs to one hierarchy class. In particular, the integration of the viewpoint mechanism to the conventional object-oriented data model gives it flexibility and allows one to improve the modeling power of objects. The viewpoint paradigm refers to the multiple descriptions, the distribution, and the evolution of object. Also, it can be an undeniable contribution for a distributed design of complex databases. The motivation of this paper is to define an object data model integrating viewpoints in databases and to present a federated database architecture integrating multiple viewpoint sources following a local-as-extended-view data integration approach.object-oriented data model, OQL language, LAEV data integration approach, MVDB model, federated databases, Local-As-View Strategy.

Type Annotation for Adaptive Systems

We introduce type annotations as a flexible typing mechanism for graph systems and discuss their advantages with respect to classical typing based on graph morphisms. In this approach the type system is incorporated with the graph and elements can adapt to changes in context by changing their type annotations. We discuss some case studies in which this mechanism is relevant.Comment: In Proceedings GaM 2016, arXiv:1612.0105

Applying Direct Combination to afford spontaneity in Pervasive Computing

In rich pervasive environments, there will be numerous opportunities for end users to dynamically create services of interest by causing two or more devices or resources to interoperate together, often under changing circumstances. In general, users find this kind of process hard to manage. Existing programming architectures make the situation difficult to address in a principled, scaleable way. Users find it hard to tackle such problems via devices with small, resource-poor user interfaces. It is proposed that a good theoretical basis for addressing an essential aspect of all of these problems is the theory of Direct Combination. When the Direct Combination framework, based on the theory, is applied to spontaneous interactions, the user interface can be made relatively simple, and the amount of search required by the user to specify desired actions can be greatly reduced. We present Direct Combination (DC) and the new interaction techniques it gives rise to for pervasive environments. We consider two different support architectures. We argue that one of these, the role-based architecture, has particularly good properties for modelling rapidly changing pervasive environments, and for highly distributed implementations. We demonstrate how the concept of viewpoints can be used to focus, filter and afford operations, and how this can be well supported by the role-based architecture

CITIDEL Collection Building

The aim of this study is to facilitate the goals of the Computing and Information Technology Interactive Digital Educational Library (CITIDEL) by increasing the number of collections available to it. This study will help in achieving this goal by focusing on four diverse collections

A Foundation for the Concept of Role in Object Modelling

Standardization experts in object modelling are having difficulties with defining the concept of rol

Degas: A Database of Autonomous objects

In this paper we introduce DEGAS (Dynamic Entities Get Autonomous Status), an active temporal data model based on autonomous objects. The natural combination of active and temporal databases is discussed. The active dimension of DEGAS means that we define the behaviour of objects in terms of production rules. The temporal dimension means that the history of an object is included in the DEGAS data model. Further novel features of DEGAS are the encapsulation of the complete behaviour of an object, both potential and actual. Thus, DEGAS combines dynamic and structural specifications in one model. In addition, DEGAS allows easy evolution of object capabilities through a clear distinction between inherent types and capabilities that can be acquired and lost. This addon mechanism makes DEGAS very suitable as a formalism for role modelling. Finally, the rule model in DEGAS is both simple, through the use of finite automata, and general, because it allows different strategies for dealing with constraints and reacting to events in other objects

Динамическое назначение ролей в языках программирования со статической типизацией

Секция 8. Программная инженерияРассмотрен подход к динамическому назначению ролей объектам в языках со статической типизацией, основанный на преобразовании типов данных. Разработан шаблон проектирования для решения задачи динамического назначения ролей. Приведена реализация шаблона на языке программирования С++