1,721,010 research outputs found
Preface to the Special Issue on Coordination and Self-Adaptiveness of Software Applications
No full textOn modelling, analysing and reusing multi-component applications
No full textHowtodeployandflexiblymanagecomplexcompositeappli- cations across heterogeneous cloud platforms is one of the main concerns in enterprise IT. There is a need for vendor-agnostic models allowing to specify the structure and management of composite cloud applications, and of techniques for verifying their design. Furthermore, the availability of techniques for reusing cloud applications would free developers from the need of designing/developing multiple times recurring application components. This paper provides an overview of our research contribu- tions on (i) modelling and analysing the structure and management of composite cloud applications, and on (ii) fostering their reus
Preface to the Special Issue on Foundations of Coordination Languages and Self-Adaptive Systems (FOCLASA 2018)
No full textSemi-Automated Smell Resolution in Kubernetes-Deployed Microservices
No full textMicroservices are getting commonplace, as their design principles enable obtaining cloud-native applications. Ensuring that applications adheres to microservices’ design principles is hence crucial, and this includes resolving architectural smells possibly denoting violations of such principles. To this end, in this paper we propose a semi-automated methodology for resolving architectural smells in microservices applications deployed with Kubernetes. Our methodology indeed automatically detects architectural smells by analyzing the Kubernetes manifest files specifying an application’s deployment, and it can also generate the refactoring templates for resolving such smells. We also introduce KubeFreshener, an open-source prototype of our methodology, which we use to assess it in practice based on a controlled experiment and a case study
Estimating costs of multi-component enterprise applications
Full text linkEstimating the cost of a multi-component application (e.g., its resource or energy consumption) isfundamental in nowadays enterprise IT, especially if we consider that current pricing models are mainly payper-use. While this is still manageable on small applications, it is really hard to manually estimate the cost oflarge-scale enterprise applications involving hundreds of interdependent application components. In this article,we formalise the problem of estimating costs of multi-component applications, by representing the structure ofan application as a typed directed graph, and by allowing to associate different types of costs with differentapplication components. We show that costs can be fully customised, and that associating different costs withthe same application leads to different cost estimation problems defined on that application.We then present anapproach for solving cost estimation problems on multi-component applications, which is based on terminatingand confluent graph transformations. We also present a prototype implemenation of our approach, which weuse to run a case study based on a third-party application
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Design principles, architectural smells and refactorings for microservices: a multivocal review
Full text linkPotential benefits such as agile service delivery have led many companies to deliver their business capabilities through microservices. Bad smells are however always around the corner, as witnessed by the considerable body of literature discussing architectural smells that possibly violate the design principles of microservices. In this paper, we systematically review the white and grey literature on the topic, in order to identify the most recognised architectural smells for microservices and to discuss the architectural refactorings allowing to resolve them
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Robust management of trans-cloud applications
No full textThe fault handling and recovery from runtime failures of cloud applications should be done by taking into account the inter-dependencies occurring among their components, and by dealing with the diverse and heterogeneous cloud offerings used to host them. The latter is even harder in trans-cloud scenarios, i.e., when application components are possibly deployed on different platforms and at different service levels (IaaS or PaaS). In this paper, we propose a methodology to support the automated management and recovery of (un) foreseen failures in a trans-cloud application, which takes into account all interdependencies occurring among its components. We then present a prototype implementation of our proposal, consisting of an orchestrator that exploits a management framework for trans-cloud application deployments, together with management protocols for the automated planning of the fault-aware administration of applications
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