Abstract
Standard based Pub/Sub middleware, such as OMG Data Distribution Service (DDS), could assume a key role in supporting computer communications requiring continuous state information updating, deterministic deadline to data delivering and real time information adjourning. This kind of capability could be well ex-ploited by Peer-To-Peer (P2P) systems, Internet-wide as long as private ones, like in Public Safety or Civil Protection Communication Systems; but Pub/Sub specifications, and DDS/RTPS (Real Time Publish Sub-scribe) as well, usually do not provide Authentication & Authorization (AA) mechanisms. In the present work two important novelties are assessed: a possible scheme to implement AA in DDS/RTPS networks and a time performance evaluation study about embedded Authentication in RTPS.
Highlights
Introduction and MotivationPervasive computing applications have been increasingly relying on event based communications during the very last years; concurrently there has been more and more interest in developing Publish/Subscribe schemes able to implement and connote such new paradigms.Much of the event based interaction style potential is in the total decoupling between information producers and consumers along several dimensions: time, space, synchronization
This kind of decoupling is mostly often implemented by a Pub/Sub middleware [1], where producers, or publishers, and consumers, or subscribers, commit collocated agents or brokers, belonging to a network laid on the actual network of communicating entities, to exchanging events and messages
Some recent research [2] has proposed that Pub/Sub schemes would perform better than traditional interactional ones in supporting this kind of applications because of their capability to offer deterministic deadline to data delivering and real time information adjourning to the overall set of participating nodes
Summary
Pervasive computing applications have been increasingly relying on event based communications during the very last years; concurrently there has been more and more interest in developing Publish/Subscribe schemes able to implement and connote such new paradigms. A great number of industrial implementations and academic prototypes have been released since it was recognized that networking equipment and protocols technologies had reached enough power and reliability to make the switch from Request/Reply architectures to Publish/Subscribe ones convenient Such a restless growing in conceiving, designing and implementing Pub/Sub middleware solutions, very diverse in scope, field of application, programming model and extendibility, has possibly prevented until now the large scale adoption of Pub/Sub communication services directly at the Internet end-user premises. Give nodes, as a collection of application entities, a certain degree of autonomy, posing the basis for autonomic behaviour These opportunities gave researchers and companies space to customize the agent based Pub/Sub paradigm in several ways, case by case emphasizing specific aspects to be obtained: high performance transfer and processing of streams, context awareness and situation detection, transparent ad hoc communication, as well as autonomic features [3]. It is not possible to consider a task for a Pub/Sub middleware addressing such a feature, because middleware is placed at transport and application layers, but it is straightforward and in some way mandatory for middleware to realize network formation at its own level through well designed discovery protocols: if, when and how to relate these protocols with lower layers network formation is an interesting, open and possibly fruitful field of research and the present work, simulating embedded AA in DDS/RTPS Discovery Protocols, besides exposing the first network formation simulation for this standard based Pub/Sub middleware, is a first implementation scheme able to allocate cross layer interactions among PHY/MAC network access coordination methods, routing construction algorithms and middleware discovery functions
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