物件導向軟體之架構(Object-Oriented Software Construction)探討

[서평]「Component Software」 - Beyond Object-Oriented Programming -

A new class of models, formalisms and mechanisms has recently evolved for describing concurrent and distributed computations based on the concept of ``coordination''''. The purpose of a coordination model and associated language is to provide a means of integrating a number of possibly heterogeneous components together, by interfacing with each component in such a way that the collective set forms a single application that can execute on and take advantage of parallel and distributed systems. In this chapter we initially define and present in sufficient detail the fundamental concepts of what constitutes a coordination model or language. We then go on to classify these models and languages as either ``data-driven'''' or ``control-driven'''' (also called ``process-'''' or ``task-oriented''''). Next, the main existing coordination models and languages are described in sufficient detail to let the reader appreciate their features and put them into perspective with respect to each other. The chapter ends with a discussion comparing the various models and some conclusions.

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Coordination models and languages

A super-peer is a node in a peer-to-peer network that operates both as a server to a set of clients, and as an equal in a network of super-peers. Super-peer networks strike a balance between the efficiency of centralized search, and the autonomy, load balancing and robustness to attacks provided by distributed search. Furthermore, they take advantage of the heterogeneity of capabilities (e.g., bandwidth, processing power) across peers, which recent studies have shown to be enormous. Hence, new and old P2P systems like KaZaA and Gnutella are adopting super-peers in their design. Despite their growing popularity, the behavior of super-peer networks is not well understood. For example, what are the potential drawbacks of super-peer networks? How can super-peers be made more reliable? How many clients should a super-peer take on to maximize efficiency? we examine super-peer networks in detail, gaming an understanding of their fundamental characteristics and performance tradeoffs. We also present practical guidelines and a general procedure for the design of an efficient super-peer network.

Designing an Super-Peer Network

All one needs to know about fog computing and related edge computing paradigms: A complete survey

Fog computing aims at extending the Cloud by bringing computational power, storage, and communication capabilities to the edge of the network, in support of the IoT. Segmentation, distribution, and adaptive deployment of functionalities over the continuum from Things to Cloud are challenging tasks, due to the intrinsic heterogeneity, hierarchical structure, and very large scale infrastructure they will have to exploit. In this paper, we propose a simple, yet general, model to support the QoS-aware deployment of multicomponent IoT applications to Fog infrastructures. The model describes operational systemic qualities of the available infrastructure (latency and bandwidth), interactions among software components and Things, and business policies. Algorithms to determine eligible deployments for an application to a Fog infrastructure are presented. A Java tool, FogTorch , based on the proposed model has been prototyped.

/pdf/qos-aware-deployment-of-iot-applications-through-the-fog-1szqpqz711.pdf

QoS-Aware Deployment of IoT Applications Through the Fog

Component adaptation is widelyrecognised to be one of the crucial problems in Component-Based Software Engineering (CBSE). We present a formal methodologyfor adapting components with mismatching interaction behaviour. The three main ingredients of the methodologyare: (1) the inclusion of behaviour specifications in component interfaces, (2) a simple, high-level notation for expressing adaptor specifications, and (3) a fullyautomated procedure to derive concrete adaptors from given high-level specifications.

/pdf/a-formal-approach-to-component-adaptation-3hec0wyu0s.pdf

A formal approach to component adaptation

Containers as a lightweight technology to virtualise applications have recently been successful, particularly to manage applications in the cloud. Often, the management of clusters of containers becomes essential and the orchestration of the construction and deployment becomes a central problem. This emerging topic has been taken up by researchers, but there is currently no secondary study to consolidate this research. We aim to identify, taxonomically classify and systematically compare the existing research body on containers and their orchestration and specifically the application of this technology in the cloud. We have conducted a systematic mapping study of 46 selected studies. We classified and compared the selected studies based on a characterisation framework. This results in a discussion of agreed and emerging concerns in the container orchestration space, positioning it within the cloud context, but also moving it closer to current concerns in cloud platforms, microservices and continuous development.

Cloud Container Technologies: A State-of-the-Art Review

http://www.lcc.uma.es/~av/Publicaciones/04/ws-fm04.pdf

Formalizing Web Service Choreographies

The heterogeneous, dynamic, distributed, and evolving nature of Web services calls for adaptation techniques to overcome various types of mismatches that may occur among services developed by different parties. In this paper we present a methodology for the automated generation of (service) adapters capable of solving behavioural mismatches among BPEL processes. The adaptation process, given two communicating BPEL processes whose interaction may lock, builds (if possible) a BPEL process that allows the two processes to successfully interoperate. A key ingredient of the adaptation methodology is the transformation of BPEL processes into YAWL workflows.

Antonio Brogi

Papers

QoS-Aware Deployment of IoT Applications Through the Fog

A formal approach to component adaptation

Cloud Container Technologies: A State-of-the-Art Review

Formalizing Web Service Choreographies

Automated generation of BPEL adapters