In this paper we tackle the problem of designing and implementing a framework for programming service coordination policies. In particular, we illustrate the design and the prototype implementation of Java Signal Core Layer (JSCL), a coordination middleware for services based on the event notification paradigm. We formally motivate the design choices of the JSCL middleware by exploiting a varia...

The development of real-time distributed applications requires middleware providing both reliability and performance. Middleware must be adaptable to meet application requirements and integrate legacy components. Current middleware provides only partial solutions to these issues. Moreover, they newer address all of them. Thus, a new generation of middleware is required. We have introduced the s...

Large-scale distributed systems require new middleware paradigms that do not suffer from the limitations of traditional request/reply middleware. These limitations include tight coupling between components, a lack of information filtering capabilities, and support for one-to-one communication semantics only. We argue that event-based middleware is a scalable and powerful new type of middleware ...

This paper provides an experimental comparison of two middleware data dissemination services: a distributed object-based service, and a message-based service. This paper compares these two services in the context of a common application: a wide-area network collaboratory, namely the Upper Atmospheric Research Collaboratory (UARC). UARCis an example of an application that reliably-streams data f...

Data backup and archiving is an important aspect of business processes to avoid loss due to system failures and natural calamities. As the amount of data and applications grow in number, concerns regarding cost efficient data preservation force organizations to scout for inexpensive storage options. Addressing these concerns, we present Tape Cloud, a novel, highly cost effective, unified storag...

Service composition provides value-adding services through composing basic Web services, which may be provided by various organizations. Cloud computing presents an efficient managerial, on-demand, and scalable way to integrate computational resources (hardware, platform, and software). However, existing Cloud architecture lacks the layer of middleware to enable dynamic service composition. To ...

Virtual Reality Environments (VRE) which simulate reality and thus present a safer learning environment, are increasingly being adopted to simulate complex systems. Such systems make the process of engineering virtual environments a complex task, especially due to the abundance of dynamic data types like behaviors. In parallel, distribution services have become essential following advances in t...

Typical WSN(Wireless Sensor Network) applications in precision agriculture include production process management, plant growth optimization, farmland monitoring and so on. Middleware, which can connect hardware, applications, and enterprise systems, is required to construct ubiquitous agricultural environment combining WSN technology with different agricultural applications, but there have been...

24 Computer Middleware Challenges Ahead I n the first attempts to define comprehensive software platforms for distributed applications 25 years ago, researchers created basic middleware elements such as remote procedure call, file service, and directory service based on dramatic advances in hardware technology and fast networking and workstation systems. Today, the scope of middleware is broade...

A special class of Internet of Things called the Industrial Internet of Things (IIoT) operates in a large, distributed and dynamic environment comprising sensors all the way to large server clusters. A key requirement for IIoT is a scalable messaging service that supports multiple quality of service (QoS) properties, such as timeliness and resilience. Although existing pub/sub standards, such a...