Exploiting peer group concept for adaptive and highly available services

This paper presents a prototype for redundant, highly available and fault tolerant peer to peer framework for data management. Peer to peer computing is gaining importance due to its flexible organization, lack of central authority, distribution of functionality to participating nodes and ability to utilize unused computational resources. Emergence of GRID computing has provided much needed infrastructure and administrative domain for peer to peer computing. The components of this framework exploit peer group concept to scope service and information search, arrange services and information in a coherent manner, provide selective redundancy and ensure availability in face of failure and high load conditions. A prototype system has been implemented using JXTA peer to peer technology and XML is used for service description and interfaces, allowing peers to communicate with services implemented in various platforms including web services and JINI services. It utilizes code mobility to achieve role interchange among services and ensure dynamic group membership. Security is ensured by using Public Key Infrastructure (PKI) to implement group level security policies for membership and service access.Comment: The Paper Consists of 5 pages, 6 figures submitted in Computing in High Energy and Nuclear Physics, 24-28 March 2003 La Jolla California. CHEP0

IT based integration business processes

Peer-to-Peer (P2P) computing represents the next revolution in the computing age. Web Services standardization will provide the means for P2P architecture to be broadly adopted by companies for enterprise and business-to-business application integration.Peer-to-peer technology, business processes, applications

A peer-to-peer infrastructure for resilient web services

This work is funded by GR/M78403 “Supporting Internet Computation in Arbitrary Geographical Locations” and GR/R51872 “Reflective Application Framework for Distributed Architectures”, and by Nuffield Grant URB/01597/G “Peer-to-Peer Infrastructure for Autonomic Storage Architectures”This paper describes an infrastructure for the deployment and use of Web Services that are resilient to the failure of the nodes that host those services. The infrastructure presents a single interface that provides mechanisms for users to publish services and to find hosted services. The infrastructure supports the autonomic deployment of services and the brokerage of hosts on which services may be deployed. Once deployed, services are autonomically managed in a number of aspects including load balancing, availability, failure detection and recovery, and lifetime management. Services are published and deployed with associated metadata describing the service type. This same metadata may be used subsequently by interested parties to discover services. The infrastructure uses peer-to-peer (P2P) overlay technologies to abstract over the underlying network to deploy and locate instances of those services. It takes advantage of the P2P network to replicate directory services used to locate service instances (for using a service), Service Hosts (for deployment of services) and Autonomic Managers which manage the deployed services. The P2P overlay network is itself constructed using novel Web Services-based middleware and a variation of the Chord P2P protocol, which is self-managing.Postprin

Asynchronous Peer-to-Peer Web Services and Firewalls

In this paper we test the suitability of Java to implement a scalable Web Service that solves a set of problems related to peer-to-peer interactions between Web Services that behind firewalls or not generally accessible. In particular we describe how to enable reliable and long running conversations through firewalls betweenWeb Service peers have no accessible network endpoints. Our solution is to implement in Java aWeb Services Dispatcher (WSD) that is an intermediary service that forwards messages and can facilitate message exchanges by supporting SOAP RPC over HTTP and WS-Addressing for asynchronous messaging. We describe how Web Service clients that have no network endpoints, such as applets, can become Web Service peers by using an additional message store-and-forward service ("mailbox"). Then we conduct a set of experiments to evaluate performance of Java implementation in realistic Web Service scenarios, involving intercontinental tests between France and the US

A conceptual architecture of distributed web services for service ecosystems

The classical nature of centralized web services client/server architecture brings about many associated problems such as performance, bottlenecks, and scalability. Meanwhile some peer-to-peer research proposals have not respected the existing web services standards, thus leaving the compatibility and feasibility issue open. Hence existing web services architecture is not designed to accommodate large-scale, distributed, internet-wide applications. In this paper, we propose a conceptual architecture for distributed web services to enable web services-based software systems to "work well" in the heterogeneous and highly distributed service ecosystem environment

A framework to coordinate web services in composition scenarios

This paper looks into the coordination of web services following their acceptance to participate in a composition scenario. We identify two types of behaviours associated with component web services: Operational and control behaviours. These behaviours are used to specify composite web services that are built upon component web services. In term of orchestration a composite web service could be either centralised or peer-to-peer. To support component/composite web services coordination per type of orchestration schema, various types of messages are exchanged between these web services. Experiments showing the use of these messages are reported in this paper as well. Copyright © 2010 Inderscience Enterprises Ltd

GRIDKIT: Pluggable overlay networks for Grid computing

A `second generation' approach to the provision of Grid middleware is now emerging which is built on service-oriented architecture and web services standards and technologies. However, advanced Grid applications have significant demands that are not addressed by present-day web services platforms. As one prime example, current platforms do not support the rich diversity of communication `interaction types' that are demanded by advanced applications (e.g. publish-subscribe, media streaming, peer-to-peer interaction). In the paper we describe the Gridkit middleware which augments the basic service-oriented architecture to address this particular deficiency. We particularly focus on the communications infrastructure support required to support multiple interaction types in a unified, principled and extensible manner-which we present in terms of the novel concept of pluggable overlay networks