Amira Ben Hamida

Service-oriented middleware for the Future Internet: state of the art and research directions

Service-oriented computing is now acknowledged as a central paradigm for Internet computing, supported by tremendous research and technology development over the last 10 years. However, the evolution of the Internet, and in particular, the latest Future Internet vision, challenges the paradigm. Indeed, service-oriented computing has to face the ultra large scale and heterogeneity of the Future Internet, which are orders of magnitude higher than those of today’s service-oriented systems. This article aims at contributing to this objective by identifying the key research directions to be followed in light of the latest state of the art. This article more specifically focuses on research challenges for service-oriented middleware design, therefore, investigating service description, discovery, access, and composition in the Future Internet of services.

An integrated development and runtime environment for the future internet

The Future Internet environments raise challenging issues for the Service-Oriented Architectures. Due to the scalability and heterogeneity issues new approaches are thought in order to leverage the SOA to support a wider range of services and users. The CHOReOS project is part of the European Community Initiative to sketch technological solutions for the future ultra large systems. In particular, CHOReOS explores the choreography of services paradigm. Within this project, a conceptual architecture combining both the development and runtime environments is realized. This chapter introduces the CHOReOS Integrated Development and Runtime Environment, aka IDRE.

Monitoring service choreographies from multiple sources

Modern software applications are more and more conceived as distributed service compositions deployed over Grid and Cloud technologies. Choreographies provide abstract specifications of such compositions, by modeling message-based multi-party interactions without assuming any central coordination. To enable the management and dynamic adaptation of choreographies, it is essential to keep track of events and exchanged messages and to monitor the status of the underlying platform, and combine these different levels of information into complex events meaningful at the application level. Towards this goal, we propose a Multi-source Monitoring Framework that we are developing within the EU Project CHOReOS, which can correlate the messages passed at business-service level with observations relative to the infrastructure resources. We present the monitor architecture and illustrate it on a use-case excerpted from the CHOReOS project.

Multilevel event-based monitoring framework for the petals enterprise service bus: industry article

In scalable and widely distributed Service-Oriented Architecture (SOA) environments, supervision is necessary to ensure services are behaving as expected and to trigger the corrective actions when needed. More specically, when dealing with distributed and scalable Enterprise Service Bus (ESB), the control of services and their interactions must be considered at several levels and in a distributed manner. Nevertheless, in order to avoid the overhead expenses, the monitoring activity needs to be operated in a non intrusive and dynamic way. To this purpose, we propose an innovative architecture performing a multilevel service monitoring that adopts an Event-Driven Architecture (EDA), enabling a loosely coupled interaction paradigm. We realize a monitoring framework that covers coarse-grained as well as fine-grained abstractions, from choreography to orchestration and services. In this paper, we report the work resulting from our involvement in several research projects in which we study the coupling of both ESB and EDA approaches. Our experience as ESB providers shows the benefit of adopting such solutions in monitoring services and collaborations, without significant overhead. We implement and validate our framework upon our industrialized open source service bus, namely Petals ESB. We envisage applying this technology to various use cases coming from Petals ESB business experience, such as administrations, civil services and corporate customers, and from research involvements.

Towards a Service and Choreography Governance Framework for Future Internet

The Service Oriented Architecture (SOA) Governance refers to all measures, rules, descision-making, information and evaluation that ensure the proper functioning and control of services whithin an organization. In the Future Internet vision of services and in a choreography context, many heteregenous services from several organizations need to collaborate together to achieve a common goal. In order to improve the interoperability, reuse, the good behavior, the control and the efficiency of a choreography, it is necessary to define a governance framework for services and choreographies. This paper addresses the raised issues by providing a governance framework vision. EasierGov deals with both services and choreographies.

A Toolkit for Choreographies of Services: Modeling, Enactment and Monitoring

The support of the business community has considerably urged the advancement of the SOA by bringing useful supporting standards, for instance for Web Services description and collaboration design. Nevertheless, as the platforms are getting wider over geographically distant locations, there is a real need of keeping the link between the design time and the runtime. Model to model approaches ensure this kind of link, and in this context, choreography models help answering such issues. We bring our know how as ESB and BPM experts and propose an open source toolkit for services choreography. This toolkit provides a way to design a choreography, execute it on an Enterprise Service Bus and finally to monitor it. A Model to Model (M2M) top-down approach is implemented. We illustrate our purpose thanks to a business use case inspired from the CHOReOS European Project.

A Flexible Monitoring Infrastructure for a Cloud-Based ESB

Nowadays, cloud platforms are widely used both in-premise in so called private Cloud or through public Clouds. Multiple models are available: IaaS platform to take benefit of ressources virtualisation, PaaS to provide development and deployment of Cloud dedicated IDE, SaaS to provide end-user ready applications. Main added value comes from the elasticity and multi-tenancy necessary for accessing largely distributed services to build complex application. Meanwhile, this capability raises the need for a monitoring infrastructure that would ensure services are behaving as expected. The control should be operated in a non intrusive and efficient way. At the same time, Event Driven Architectures (EDAs) are considerably growing thanks to the loosely coupling paradigm they provide. The SocEDA project investigates innovative solutions to provide a Cloud-based platform for large scale social aware Event-Driven Architecture (EDA). In this context, we take benefit from both Enterprise Service Bus (ESB) and EDA technologies in order to provide a flexible monitoring infrastructure for a cloud-friendly ESB. In this paper, we present the main aspects of the implemented middleware.