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Service choreographies are a versatile approach for building service-based distributed systems. Many approaches can be found in the literature tackling different aspects of service choreographies, such as choreography realizability and conformance checking, distributed coordination, formal choreographic languages, and scalability. As of today, choreography scalability has not been specifically addressed through approaches that also consider coordination issues while still decoupling these two related aspects. Scalability is one of the most important properties to be considered when building distributed systems. It enhances the user-perceived performances and influences the overall dependability of the system. In particular, load scalability allows distributed service-oriented systems to effectively handle varying loads without suffering performance degradation. In this direction, microservice-based systems are able to scale thanks to the possibility of replicating those microservices exposed to growing loads, distributing their workload among different instances. By leveraging on our experience in coordinating service choreographies, in this paper, we propose a layered architectural style that allows to realize scalable microservice-oriented choreographies. The architecture integrates a fully-distributed coordination layer capable of ensuring the correct interactions and a load-balancing layer that allows to balance of coordinated requests. We discuss the properties of the proposed architectural style and evaluate its benefits on user-perceived performances. [ABSTRACT FROM AUTHOR]

Modern technologies and emerging wireless communication solutions in the Information and Communications Technology (ICT) world are empowering the spread of the most disparate ready‐to‐use software services distributed over the globe and accessed by an increasing number of users. This state of affairs encourages the development of systems based on the reuse of existing services through composition approaches, notably choreographies. Also Public Administrations are driven towards a digitalization process which exploits composition approaches to build complex and interoperable systems that can be remotely accessed by citizens and authorities. However, an automatic support is needed in order to realize the service composition and the distributed coordination logic that enforces the correct choreography realization. Moreover, the need for building dynamic and user‐centered systems calls for the realization of choreographies capable to adjust their behavior to the surrounding context. This work presents our proposal for addressing the choreography realization problem, by describing an automated process for the synthesis of choreography‐based systems. The synthesized systems are location‐aware and able to adapt the services' interaction according to the user's needs and context conditions. We show and evaluate our approach at work on a real use case scenario in the Public Administration domain. [ABSTRACT FROM AUTHOR]

Summary: Service choreographies support a distributed composition approach that is based on the specification of the external interaction of the participant services in terms of flows of message exchanges, given from a global perspective. When developing distributed service‐based applications, different services are produced by different teams; at the same time, such choreographies can also interact with third‐party services, hence leading to the reuse of black‐box services. Enforcing a global coordination logic across the many in‐house and third‐party services to correctly realize the specified choreography is a nontrivial endeavor. Automatic support is then desirable. In this article, we present an integrated development and run‐time environment for choreography‐based systems, which covers all the development activities, including specification, code synthesis, automatic deployment, enactment, and monitoring on the Cloud. We focus on providing a practical solution, that is, applicable by the community and considering technological standards used in the industry. We report the results of an experiment that we conducted with a use case in the in‐store marketing and sales domain. Results confirm confidence in the approach and show that the platform can be applied in practical contexts. [ABSTRACT FROM AUTHOR]

Future Internet research promotes the production of a distributed-computing environment that will be increasingly surrounded by a virtually infinite number of software services that can be composed to meet user needs. Services will be increasingly active entities that, communicating peer-to-peer, can proactively make decisions and autonomously perform tasks. Service choreography is a form of decentralized service composition that describes peer-to-peer message exchanges among participant services from a global perspective. In a distributed setting, obtaining the coordination logic required to realize a choreography is nontrivial and error prone. So, automatic support for realizing choreographies is needed. For this purpose, researchers developed a choreography synthesis tool. The Web extra at http://www.di.univaq.it/marco.autili/synthesis/shortdemo/demo.htm is a short demonstration of CHOReOSynt, a choreography synthesis tool. [ABSTRACT FROM PUBLISHER]

• CHOReVOLUTION is a platform for the tool-assisted realization of distributed systems. • CHOReVOLUTION targets service choreographies oriented applications. • CHOReVOLUTION offers a wizard-aided front-end for choreography specification. • CHOReVOLUTION provides REST services for the automatic generation of the artefacts. • CHOReVOLUTION defines a back-end for system deployment and execution. This paper presents CHOReVOLUTION, a platform for the tool-assisted realization and execution of distributed applications. CHOReVOLUTION specifically targets service-oriented systems specified through service choreographies. It offers an Integrated Development and Runtime Environment (IDRE) organized into three layers, namely, front-end, back-end, and cloud. It comprises a wizard-aided development environment and a system monitoring console in the front-end layer, and a back-end for managing the deployment and execution of the choreographed system on the cloud. We describe the IDRE by using an industrial use case in the domain of Smart Mobility & Tourism, and finally we provide details on its experimental evaluation. [ABSTRACT FROM AUTHOR]

Next Generation Internet (NGI) is the European initiative launched to identify the future internet technologies, designed to serve the needs of the digitalized society while ensuring privacy, trust, decentralization, openness, inclusion, and business cooperation. NGI provides efficient support to promote diversity, decentralization and the growth of disruptive innovation envisioned by smart cities. After the earthquake of 6 April 2009, the city of L'Aquila is facing a massive and innovative reconstruction process. As a consequence, nowadays, the L'Aquila city can be considered as a living laboratory model for applications within the context of smart cities. This paper describes and evaluates the realization of a Collaborative Road Mobility System (CRMS) for L'Aquila city by using our CHOReVOLUTION approach for the automated choreography production. The CRMS allows vehicles and transport infrastructure to interconnect, share information and use it to coordinate their actions. [ABSTRACT FROM AUTHOR]