Asynchronous Document Dissemination in Dynamic Ad Hoc Networks

This paper presents a document-oriented model for information dissemination in dynamic ad hoc networks, such as those composed of highly mobile and volatile communicating devices (e.g. laptops and PDAs). This model relies on an asynchronous, peer-to-peer propagation scheme where documents can be cached on intermediate devices, and be later sent again --either spontaneously or on demand-- in the network

A Java Middleware Platform for Resource-Aware Distributed Applications

This paper reports the development of D-RAJE (Distributed Resource-Aware Java Environment), a Java-based middleware platform that makes it possible to model and to monitor resources in a distributed environment. With this middleware, any kind of hardware or software resource can be modelled using standard Java objects, and services allow to discover local as well as remote resources, and to observe the state of these resources either locally or remotely. D-RAJE is meant to ease the development of adaptive, security-oriented, or QoS-oriented Java applications, as well as the development of platforms capable of supporting such demanding applications

Towards Resource Consumption Accounting and Control in Java: A Practical Experience

Introduction All software components are not equivalent as far as resource access and consumption are concerned. Some components can do very well with sparse or even missing resources, while others require guaranteed access to the resources they need. In order to deal with non-functional requirements pertaining to resource utilisation we propose a contractual approach of resource management and access control. This idea is being investigated in the context of project RASC (Resource-Aware Software Components). In this project our objective is to provide software components with means to specify their requirements regarding hardware and/or software resources, and to design methods and models for utilising this kind of information at any stage of a component's life-cycle. This short paper reports the design of two software products called RAJE and JAMUS, whose development is in progress in the context of project RASC. RAJE is an extension of the standard Java 2 platform. It reifies

Middleware Support for the Deployment of Resource-Aware Parallel Java Components on Heterogeneous Distributed Platforms

This paper reports the development of the Concerto platform, which is dedicated to supporting the deployment of resource-aware parallel Java components on heterogeneous distributed platforms, such as pools of workstations in labs or offices. Our work aims at proposing a basic model of a parallel Java component, together with mechanisms and tools for managing the deployment of such a component on a distributed platform. Moreover, we strive to provide components with means to perceive their runtime environment, so they can for example dynamically adapt themselves to changes occurring in this environment. The Concerto platform was designed in order to allow the deployment of parallel components on a distributed platform. It additionally defines and implements an open and extensible framework for distributed resource discovery and monitoring in such an execution environment

Delta-State-Based Synchronization of CRDTs in Opportunistic Networks

International audienceConflict-Free Replicated Data Types (CRDTs) are distributed data types that support optimistic replication: replicas can be updated locally, and updates propagate asynchronously among replicas, so consistency is eventually obtained. This ability to tolerate asynchronous communication makes them ideal candidates to serve as software building blocks in opportunistic networks (OppNets), that is, mobile networks in which the dissemination of information can only depend on unpredicted transient radio contacts between pairs of nodes. In this paper we investigate the problem of implementing CRDTs in an OppNet, and we propose a delta-state-based algorithm to solve this problem. Experimental results confirm that this algorithm ensures the synchronization of CRDT replicas in an OppNet, and that it outperforms a pure state-based synchronization algorithm when dealing with container CRDTs

Middleware Support for Resource-Constrained Software Deployment

The JAMUS platform is dedicated to providing a safe runtime environment for untrusted Java application programs, while offering each of these programs access to the resources it needs to use at runtime. To achieve this goal, JAMUS implements a contractual approach of resource utilisation and control, together with a reservation-based resource management scheme, and a monitoring model. When getting deployed on the platform, a candidate program must first subscribe a contract with the resource manager of the platform. This contract describes the resources the program requires to be able to access at runtime, and how it plans to behave when accessing these resources. Based on this information, the platform can monitor programs at runtime, so that any violation of the contracts they subscribed can be detected and sanctioned. Moreover, since the specific needs of a program are liable to change (or to be refined) dynamically while this program is running, any program hosted by the platform can ask that its contract be re-negotiated at any time

Towards Resource-Aware Parallel Java Components

This paper reports the development of the Concerto platform, which is dedicated to supporting the deployment of resource-aware parallel Java components on heterogeneous distributed platforms, such as pools of workstations in labs or offices. We propose a basic model of a parallel Java component and present some tools that facilitate the management and the deployment of such a component on a distributed architecture. The Concerto platform also defines and implements an open and extensible framework dedicated to the observation of the distributed environment on which a component is deployed. Support is provided for modeling the execution environment as a set of resources and for monitoring these resources in a distributed way

Programmation par objets et parallelisme de donnees dans Paladin

Programme 1 - Architectures paralleles, bases de donnees, reseaux et systemes distribues. Projet PampaAvailable at INIST (FR), Document Supply Service, under shelf-number : 22588, issue : a.1994 n.880 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueSIGLEFRFranc