4,863 research outputs found
Coordination Contracts as Connectors in Component-Based Development
Several proposals for component-based development
methods have started to appear. However, the emphasis is
still very much on the development of components as
opposed to the development with components. The main
focus is on how to generate ideal reusable components not
on how to plug existing components and specify their
interactions and connections.
The concept of a coordination contract (Andrade and
Fiadeiro 1999; Andrade and Fiadeiro 2001; Andrade,
Fiadeiro et al. 2001) has been proposed to specify a
mechanism of interaction between objects based on the
separation between structure, what is stable, and
interaction, what is changeable. This separation supports
better any change of requirements, as contracts can be
replaced, added or removed dynamically, i.e. in run-time,
without having to interfere with the components that they
coordinate. A coordination contract corresponds to an
expressive architectural connector that can be used to plug
existing components.
In this paper we integrate the concept of a coordination
contract with component-based development and show
how coordination contracts can be used to specify the
connectors between components
Formalising dynamic composition and evolution in Java systems
A variety of Java constructs involve an idea of time dynamic establishment and closure of connections or the composition and customisation of components in order to guarantee reliability and maintainability in dynamic evolving systems we will take a process oriented view on composition and interaction. This will be supported by a contract concept to formalise matching of suitable service provider and requestor
Management and Service-aware Networking Architectures (MANA) for Future Internet Position Paper: System Functions, Capabilities and Requirements
Future Internet (FI) research and development threads have recently been gaining momentum all over the world and as such the international race to create a new generation Internet is in full swing: GENI, Asia Future Internet, Future Internet Forum Korea, European Union Future Internet Assembly (FIA). This is a position paper identifying the research orientation with a time horizon of 10 years, together with the key challenges for the capabilities in the Management and Service-aware Networking Architectures (MANA) part of the Future Internet (FI) allowing for parallel and federated Internet(s)
Towards a Layered Architectural View for Security Analysis in SCADA Systems
Supervisory Control and Data Acquisition (SCADA) systems support and control
the operation of many critical infrastructures that our society depend on, such
as power grids. Since SCADA systems become a target for cyber attacks and the
potential impact of a successful attack could lead to disastrous consequences
in the physical world, ensuring the security of these systems is of vital
importance. A fundamental prerequisite to securing a SCADA system is a clear
understanding and a consistent view of its architecture. However, because of
the complexity and scale of SCADA systems, this is challenging to acquire. In
this paper, we propose a layered architectural view for SCADA systems, which
aims at building a common ground among stakeholders and supporting the
implementation of security analysis. In order to manage the complexity and
scale, we define four interrelated architectural layers, and uses the concept
of viewpoints to focus on a subset of the system. We indicate the applicability
of our approach in the context of SCADA system security analysis.Comment: 7 pages, 4 figure
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