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Distributed systems like crisis management are subject to the dissemination of a huge volume of heterogeneous events, ranging from low level network data to high level crisis management intelligence, depending on the role of the rescue teams involved. In such systems, Complex Event Processing (CEP) has emerged as a solution to detect and react (in real-time) to complex events, which are correlations...
Handling the dynamics of future service-based distributed systems in real-time is a complex problem; a number of state transitions or reconfigurations take place that must be handled in real-time; this requires to impose some bounds to the structure of the system to ensure timely operation. We present a model for real-time reconfiguration based on a service model using the concept of service implementations...
This paper describes the Context Awareness Framework developed for the HYDRA Middleware Project. The HYDRA project aims to develop middleware to support intelligent networked embedded system based on a service-oriented architecture, deployable on both new and existing networks of distributed wireless and wired devices. A well developed Context Awareness Framework (CAF) is crucial for the success of...
Business requirements for rapid operational efficiency, customer responsiveness as well as rapid adaptability are actively driving the need for ever increasing communication and integration capabilities of software assets. In this context, security, although acknowledged as being a necessity, is often perceived as a hindrance. Indeed, dynamic environments require flexible and understandable security...
Service Oriented Architecture (SOA) is not only an architecture, rather it is a relationship between the service provider, broker and user. Designing middleware platforms for this architecture really helps in achieving interoperability, loose coupling and high efficiency especially for applications running in heterogeneous environments. The job of an SOA middleware is to cater for the functional properties...
This article describes middleware by adopting a horizontal and a vertical layer views. Middleware are enabling technologies for application development and execution in ubiquitous environments. In the horizontal view, we find most types of middleware developed so far, such as MOM, ORB, databases middleware and more recently SOA. Two new concepts emerged in this category, the ``middleware of sensors"...
Component integration plays a decisive role in service-oriented architectures (SOAs). The technical implementation must faithfully reflect business and enterprise integration requirements. This implies a good understanding of the globally observable message choreography but also of how messages are handled by the involved components and by the SOA middleware. In this paper, we present a solution to...
Negotiation of service level agreements (SLAs) is very important for maintaining quality of service (QoS) of composite Web services-based business processes. The process of negotiation involves specification of negotiation parameters, exchanging offers to conduct the actual negotiation process, and then finally generating the formal SLA if the negotiating parties come to a consensus. We propose a...
Recent advances in wireless networks and mobile devices have brought about new scenes for the provision of services to end-users. Besides traditional services, new ones may be provided that transparently adjust and adapt to the user context. The user would have more choice and flexibility if, besides using the services, he could also compose his own services in an ad-hoc way. This paper presents iCas,...
Service oriented middleware (SOM) is getting key support to enable service oriented architecture deployment in next generation pervasive networking - e.g., Beyond 3rd Generation (B3G). This paper proposes a reference model for architecting SOM solutions over B3G network.
Service-oriented architecture supports the dynamic establishment of composite services issued from different organizations and delivers a large spectrum of innovative services. In such distributed environment, authentication and authorization processes require flexible access control to deal with heterogeneous services' directories and dynamic network of identity providers. Federated identity management...
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