Military Communications and Information Technology: A Trusted ...
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Military Communications and Information Technology: A Trusted ...

Military Communications and Information Technology: A Trusted ... Military Communications and Information Technology: A Trusted ...

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22.01.2015 Views

252 Military Communications and Information Technology... [8] libpq–PostgreSQL C Library, http://www.postgresql.org/docs/8.4/static/libpq.html, 2012. [9] JAVA API for SIP Signaling http://jsip.java.net/ [10] Google Projects for Android, http://code.google.com/intl/pl/android/ [11] E. Friedman-Hill, Jess in Action, Manning Publications Co., 2003. [12] http://clarkparsia.com/pellet/ [13] I. Horrocks, P.F. Patel-Schneider, H. Boley, Said Tabet, B. Grosof, M. Dean, SWRL: A Semantic Web Rule Language Combining OWL and RuleML. [14] M. O’Connor, A. Das, SQWRL: a Query Language for OWL.

A Robust and Scalable Peer-to-Peer Publish/Subscribe Mechanism Tobias Ginzler Communication Systems Fraunhofer FKIE Wachtberg, Germany, tobias.ginzler@fkie.fraunhofer.de Abstract: In this work a publish/subscribe peer-to-peer mechanism is presented. The purpose of KadScribe is to enable a subscription-based message dissemination mechanism for a large number of participants. The mechanism is intended as a building block for other protocols and applications. Possible applications include SOA messaging, weather information or an instant messaging presence service. The focus is on best-effort, low data rate services. The special challenges of disadvantaged networks such as volatile user behavior, low transmission capacity and faulty network connections are respected. Mechanisms to deal with these challenges in the publish/subscribe system are presented and evaluated in a simulated network environment. Keywords: peer-to-peer, publish/subscribe, computer networks I. Introduction Peer-to-peer overlay networks first appeared in the late 1990ies and rapidly gained popularity in the following years. The typical usage scenario was sharing and downloading of music files in the mp3 file format. File sharing over peer- topeer – or P2P – networks soon came to notorious fame, because it was mainly used to exchange copyright protected content. Ongoing legal disputes led to the end of the most popular file sharing network of that time, Napster, in 2001. The new feature of Napster was to enable users worldwide to share content and publish information without the effort of setting up hardware or writing code. The philosophy of P2P networks was and still is today, that every participant may be consumer of information as well as a publisher of information. Tim Berners-Lee had the concept of sharing in mind, “That was what it was designed to be as a collaborative space where people can interact.” [3]. The need for interaction and collaboration was unbroken by the end of Napster. Soon the gap left by Napster was filled by numerous P2P networks, built to overcome the fragile design of the first generation of peerto-peer networks. A nearly uncountable variety of protocols and P2P applications exist today. P2P technology is used to distribute software updates or to find persons for remote software support. Instant messaging relies on P2P overlays [1] as well

252 <strong>Military</strong> <strong>Communications</strong> <strong>and</strong> <strong>Information</strong> <strong>Technology</strong>...<br />

[8] libpq–PostgreSQL C Library, http://www.postgresql.org/docs/8.4/static/libpq.html,<br />

2012.<br />

[9] JAVA API for SIP Signaling http://jsip.java.net/<br />

[10] Google Projects for Android, http://code.google.com/intl/pl/<strong>and</strong>roid/<br />

[11] E. Friedman-Hill, Jess in Action, Manning Publications Co., 2003.<br />

[12] http://clarkparsia.com/pellet/<br />

[13] I. Horrocks, P.F. Patel-Schneider, H. Boley, Said Tabet, B. Grosof, M. Dean,<br />

SWRL: A Semantic Web Rule Language Combining OWL <strong>and</strong> RuleML.<br />

[14] M. O’Connor, A. Das, SQWRL: a Query Language for OWL.

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