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

As for every new technological trend, education of new scientists and engineers will be instrumental in shaping the implementation of the Fog architecture, including software development. In this paper, we describe a 2-hour hands-on lab activity that we designed and run during an M.Sc. course at the Department of Computer Science of the University of Pisa, Italy. The proposed activity is designed to practically (and incrementally) show different deployment models for IoT applications — viz., IoT+Edge, IoT+Cloud and Fog — over a meaningful yet simple application example. In addition to featuring a quick learning curve and limited cost, the proposed activity shows some possible extensions to design other lab sessions.

Antonio Brogi

Papers

Bonsai in the Fog: An active learning lab with Fog computing

On the potential advantages of exploiting behavioural information for contract-based service discovery and composition

Dynamic Contextual Adaptation

FaaSten your decisions: A classification framework and technology review of function-as-a-Service platforms

On the Expressiveness of Relative-Timed Coordination Models