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P2P is a popular networking paradigm in today's internet. As such, many research and development efforts are geared toward services that can be useful to the users of P2P networks. This paper is focused on the content-based publish/subscribe service and the authors' problem is to devise an efficient mechanism that enables this service in any given P2P network of cooperative nodes. Most techniques require some overlay structure added on top of the network. They propose an efficient solution called PUB-2-SUB which works with any unstructured network topology. In addition, multiple independent publish/subscribe applications can run simultaneously on a single instance of PUB-2-SUB. The proposed technique is based on two key components: the virtualization component and the indexing component.
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