Overlay networks a scalable alternative for p2p

Doval, D.; O’Mahony, Donal

doi:10.1109/mic.2003.1215663

Cited by 94 publications

(44 citation statements)

References 9 publications

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“…More general approaches establish an overlay network to completely abstract from technological details of the underlying transport layer (e.g. [6]). …”

Section: Mobile Web Service Architectures and Use Of Mediator Componentsmentioning

confidence: 99%

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Realizing Mobile Web Services for Dynamic Applications

Zaplata

Dreiling

Lamersdorf

2009

Software Services for E-Business and E-Society

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Abstract. Use of web services also on mobile devices becomes increasingly relevant. However, realizing such mobile web services based on the standard protocol stack is often inappropriate for resource-restricted mobile devices in dynamic networks. On the other hand, using specialized alternative protocols restricts compatibility with traditional service applications. Thus, existing approaches often do not allow to integrate heterogeneous service instances dynamically, as it is, e.g., required for executing mobile service-based business processes. In order to adequately support such more complex and dynamic applications, this paper presents a lean and flexible system architecture which supports both mobile web service consumers and providers by allowing to integrate multiple protocols depending on their capabilities and to dynamically access suitable service instances at runtime. As a proof of concept, the paper shows an exemplary combination of practically relevant protocols for resource-limited devices based on WSDL, ASN.1 and overlay transport and presents its integration in a prototype scenario for supporting decentralized mobile business processes.

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“…More general approaches establish an overlay network to completely abstract from technological details of the underlying transport layer (e.g. [6]). …”

Section: Mobile Web Service Architectures and Use Of Mediator Componentsmentioning

confidence: 99%

“…proposed in [6]). To detect other devices in the environment, participating devices use their communication adapter to send short broadcast messages in periodic intervals.…”

Section: Listing 1 Wsdl Bindingmentioning

confidence: 99%

Realizing Mobile Web Services for Dynamic Applications

Zaplata

Dreiling

Lamersdorf

2009

Software Services for E-Business and E-Society

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“…By using the node lookup protocol, we can classify overlay networks into one of two types: 8 • Content-addressable overlays, in which network topology and object content are related. Distributed hash table-(DHT-) based techniques 9 convert object identifiers into overlay node identifiers, thus guaranteeing object location (if the object is present); search times are bounded.…”

Section: Figure 3 Event Model Taxonomy This Is the Basis For Classimentioning

confidence: 99%

A Taxonomy of QoS-Aware, Adaptive Event-Dissemination Middleware

Mahambre

Kumar

Bellur

2007

IEEE Internet Comput.

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Event broker networks -scalable versions of the publish-subscribe paradigmact as peer-to-peer overlays on broker nodes. Various frameworks support different overlay topologies and routing schemes for event dissemination, but attention is now turning to the nonfunctional attributes (such as quality of service) of such systems. Although many research efforts are starting to address the need for adaptation and QoS, no taxonomies or comprehensive surveys of adaptive middleware, which provide support for service guarantees, exist yet. To tackle this knowledge gap, the authors examine existing event-based middleware efforts, focusing on quality of service and adaptation. Middleware for event broker networks (EBNs) both alleviates the issues related to underlying platform heterogeneity and provides a uniform application interface. A common service interface that such middleware provides is publish-subscribe, 1 a paradigm in which producers publish information and consumers subscribe to it. In EBNs, information of interest is encapsulated in events; on such networks, middleware stores and manages subscriptions as well as routes events. This model's fully decoupled nature in terms of time, space, and synchronization 1 makes it highly suitable for large-scale distributed applications. Middleware for event broker networks is also known as eventdissemination middleware (EDM).To disseminate events, an EBN overlay network 2 uses a subset of the underlying existing physical network (an overlay link itself is virtual but could consist of several physical links to the underlying network). Therefore, middleware must execute on each overlay node that has to work cooperatively to accomplish its functions. Such event-based architectures appear in various domains, many of which themselves require quality-of-service (QoS) guarantees from the underlying infrastructure. However, our survey of existing efforts in research-and-industrybased event dissemination middleware indicates significant gaps in efforts to address these needs; in fact, we found that few middleware options 3-5 provide support for nonfunctional service guarantees. Because a comprehensive survey of current options doesn't yet exist, this article offers a review of existing event-based systems, classified with a taxonomy of adaptive, event-based middleware that provides QoS guarantees. Middleware ArchitectureAs Figure 1 shows, event-based middleware has a layered architecture. The core comprises mandatory functional features, such as the event model, the subscription scheme used to disseminate events, and the overlay routing substrate. The layer on top of the core forms a set of optional services -that is, the nonfunctional QoS guarantees the middleware provides, such as reliability, delivery semantics, message ordering, security, and fault tolerance. QoS guarantees are orthogonal to middleware-supported core functions; the middleware's ability to reconfigure itself to ensure and maintain a QoS agreement is its adaptability, which can result in changes to the core's subs...

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“…However, overlay networks can help in addressing these issues because they have a network semantics layer above the basic transport protocol level ( Figure 1). This organizes the network topology according the nodes' content, implementing a distributed hash table abstraction that provides load balancing, query forwarding and bounded lookup times [2].…”

Section: Introductionmentioning

confidence: 99%