P/S-CoM: Building correct by design Publish/Subscribe architectural styles with safe reconfiguration
Journal of Systems and Software
Formal design of structural and dynamic features of publish/subscribe architectural styles
ECSA'07 Proceedings of the First European conference on Software Architecture
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A fundamental problem for both structured and unstructured peer-to-peer networks is how to maintain connected the topology of a network in the presence of processes that, possibly concurrently, join and leave the network. In this paper we firstly define a model of the computation well-suited to analyze connectivity maintenance among processes carrying out a distributed computation considering unbounded concurrency and infinite participation. Secondly upon this model we provide a specification of the connectivity maintenance problem. We finally present a protocol that guarantees connectivity maintenance by arranging processes of the computation on a tree. The protocol handles both joins and leaves concurrently and actively (i.e., some piece of code is executed by a leaving/joining process interacting with its neighbors in the topology).