Aspect] is a simple and practical aspect-oriented extension to Java With just a few new constructs, AspectJ provides support for modular implementation of a range of crosscutting concerns. In AspectJ's dynamic join point model, join points are well-defined points in the execution of the program; pointcuts are collections of join points; advice are special method-like constructs that can be attached to pointcuts; and aspects are modular units of crosscutting implementation, comprising pointcuts, advice, and ordinary Java member declarations. AspectJ code is compiled into standard Java bytecode. Simple extensions to existing Java development environments make it possible to browse the crosscutting structure of aspects in the same kind of way as one browses the inheritance structure of classes. Several examples show that AspectJ is powerful, and that programs written using it are easy to understand.

An overview of AspectJ

A brief review of the Internet history reveals the fact that the Internet evolved after the formation of primarily independent networks. Similarly, interconnected clouds, also called Inter-cloud, can be viewed as a natural evolution of cloud computing. Recent studies show the benefits in utilizing multiple clouds and present attempts for the realization of an Inter-cloud or federated cloud environment. However, cloud vendors have not taken into account cloud interoperability issues, and each cloud comes with its own solution and interfaces for services. This survey initially discusses all the relevant aspects motivating cloud interoperability. Furthermore, it categorizes and identifies possible cloud interoperability scenarios and architectures. The spectrum of challenges and obstacles that the Inter-cloud realization is faced with are covered, a taxonomy of them is provided, and fitting enablers that tackle each challenge are identified. All these aspects require a comprehensive review of the state of the art, including ongoing projects and studies in the area. We conclude by discussing future directions and trends toward the holistic approach in this regard.

http://romisatriawahono.net/lecture/rm/survey/network%20security/Toosi%20-%20Interconnected%20Cloud%20Computing%20Environments%20-%202014.pdf

Interconnected Cloud Computing Environments: Challenges, Taxonomy, and Survey

It has been more than fifteen years since the term Internet of Things (IoT) was introduced. However, despite the efforts of research groups and innovative corporations, still today it is not possible to say that the IoT is upon us. This is mainly due to the fact that a unified IoT architecture has not yet been clearly defined and there is no common agreement in defining communication protocols and standards for all the IoT parts. The framework that current IoT platforms use consists mostly in technologies that partially fulfill the IoT requirements. While developers employ existing technologies to build the IoT, research groups are working on adapting protocols to the IoT in order to optimize communications. In this paper, we present and compare existing IoT application layer protocols as well as protocols that are utilized to connect the “things” but also end-user applications to the Internet. We highlight IETF’s CoAP, IBM’s MQTT, HTML 5’s Websocket among others, and we argue their suitability for the IoT by considering reliability, security, and energy consumption aspects. Finally, we provide our conclusions for the IoT application layer communications based on the study that we have conducted.

A Survey on Application Layer Protocols for the Internet of Things

This book provides an in-depth description of event-based systems, covering topics ranging from local event matching and distributed event forwarding algorithms, through a practical discussion of software engineering issues raised by the event-based style, to state-of-the-art research in event-based systems like composite event detection and security. The authors offer a comprehensive overview, and show the power of event-based architectures in modern system design, encouraging professionals to exploit this technique in next generation large-scale distributed applications like information dissemination, network monitoring, enterprise application integration, or mobile systems.

/pdf/distributed-event-based-systems-33fttbtql7.pdf

Distributed event-based systems

In an environment where computing power is ubiquitous, software engineers need to cater for many different variables beyond their control. They face what has been termed the pervasive problem. Their products need to be adaptable and portable, yet still retain a simple code base. Context-Oriented Programming (COP) is a new method of programming which aims to alleviate these problems by incorporating context as a first-class construct of a programming language, much in the same way that variables, classes, and functions form the first-class constructs of many modern languages.
A context-oriented program is one with many ‘gaps’ or ‘open-terms’, and the context-filling operation completes such a program by dynamically selecting portions of code from a repository of candidates to fill these gaps. This selection process is based on the execution context of the program and a description of the open-term’s requisites.
This paper describes the requirements for COP, focusing on this fundamental operation of context-filling. An implementation which meets many of these requirements is also presented.

Context-oriented programming

Following the vision of an Internet of Things (IoT) real world objects are integrated into the Internet to provide data as sensors and to manipulate the real world as actors. While current IoT approaches focus on the integration of things based on service technologies, scenarios in domains like smart cities, automotive or crisis management require service platforms involving real world objects, backend-systems and mobile devices. In this paper we introduce a service platform based on the Extensible Messaging and Presence Protocol (XMPP) for the development and provision of services for such pervasive infrastructures. We argue for XMPP as protocol for unified, real-time communication and introduce the major concepts of our platform. Based on two case studies we demonstrate real-time capabilities of XMPP for remote robot control and service development in the e-mobility domain.

https://www.rn.inf.tu-dresden.de/uploads/Publikationen/p385-bendel.pdf

A service infrastructure for the Internet of Things based on XMPP

In the light of the Web 2.0 movement, web-based collaboration tools such as Google Docs have become mainstream and in the meantime serve millions of users. Apart from established collaborative web applications, numerous web editors lack multi-user support even though they are suitable for collaborative work. Enhancing these single-user editors with shared editing capabilities is a costly endeavor since the implementation of a collaboration infrastructure (accommodating conflict resolution, document synchronization, etc.) is required. In this paper, we present a generic transformation approach capable of converting single-user web editors into multi-user editors. Since our approach only requires the configuration of a generic collaboration infrastructure (GCI), the effort to inject shared editing support is significantly reduced in contrast to conventional implementation approaches neglecting reuse. We also report on experimental results of a user study showing that converted editors meet user requirements with respect to software and collaboration qualities. Moreover, we define the characteristics that editors must adhere to in order to leverage the GCI.

Exploiting single-user web applications for shared editing: a generic transformation approach

A method for the production of an acidified nutritionally fortified cultured dairy beverage or yogurt product and the resulting product containing live and active cultures comprising preparing a non-fermented fluid dairy base, homogenizing and pasteurizing said base mix, adding a yogurt to said base mix, adding an acid blend to said base mix, comminuting said base mix to reduce particle size, adding a flavor and a color to said base mix, and packaging to provide an acidified nutritionally fortified cultured dairy beverage composition containing live and active cultures, having a finished product culture count of at least 1.5 x 108 cfu/gram, a viscosity of 400 to 3500 cps at a temperature of 1°C to 7°C and a final pH of 3.8 to 4.5.

Dairy beverage and method of preparation thereof

The paper deals with quality attributes for mobile web applications. It describes typical challenges when developing mobile web applications and relates the challenges to the ISO 9126 quality attributes. The quality attributes are summarized to an ISO model that is focusing on the most important quality attributes for the quality assurance of mobile web applications. Finally, the paper proposes that applying formal quality assurance methods during the development of mobile web applications may solve some of the challenges in mobile web application development.

Quality Attributes in Mobile Web Application Development

As pervasive computing meets social networks, there is a fast growing research field called pervasive social computing. Applications in this area exploit the richness of information arising out of people using sensor-equipped pervasive devices in their everyday life combined with intense use of different social networking services. We call this set of information pervasive social context. We provide a taxonomy to classify pervasive social context along the dimensions space, time, people, and information source (STiPI) as well as commenting on the type and reason for creating such context. A survey of recent research shows the applicability and usefulness of the taxonomy in classifying and assessing applications and systems in the area of pervasive social computing. Finally, we present some research challenges in this area and illustrate how they affect the systems being surveyed.

/pdf/pervasive-social-context-taxonomy-and-survey-2fa713m64y.pdf

Thomas Springer

Papers

A service infrastructure for the Internet of Things based on XMPP

Exploiting single-user web applications for shared editing: a generic transformation approach

Dairy beverage and method of preparation thereof

Quality Attributes in Mobile Web Application Development

Pervasive social context: Taxonomy and survey