RELIABLE EVENT DISSEMINATION FOR TIME-SENSIBLE APPLICATIONS OVER WIDE-AREA NETWORKS release_5trkbpz635bwdlzkbouf27i2qq

Abstract

Introduction Context In the recent decades we have witnessed a massive proliferation of the Internet, which succeeded to pervade all our daily activities and to be adopted throughout the entire world. The emergence of the Internet as a general communication channel is considerably affecting the scale of current software systems and deeply transforming the architecture of future critical systems. %In fact, a report, produced by Carnegie Mellon University's Software Engineering Institute (SEI) in June 2006, envisioned how future software systems are going to be architected, introducing the so-called Ultra Large Scale (ULS) systems, which are defined as federations of heterogeneous and independent systems glued together by a middleware solution. Such systems are characterized by (i) billions lines of code, (ii) several users, (iii) large amount of data stored, accessed, manipulated, and refined, (iv) many connections and interdependencies, and (v) extremely-high geographic distribution. Traditionally, a critical system consists of a monolithic, "close world'', architecture, i.e., several computing nodes interconnected by a dedicated network with limited or no connectivity towards the outside world. An example of such traditional architecture is Supervisory Control And Data Acquisition (SCADA), e.g., which is used in several current critical systems such as the control room of power plants or air traffic control systems. However, future critical systems will shift to an innovative federated, ``open world'', architecture, namely Large scale Complex Critical Infrastructure (LCCI), which belongs to the group of the so-called Ultra Large Scale (ULS) systems, which were envisioned in a report produced by Carnegie Mellon University's Software Engineering Institute (SEI) in June 2006. Specifically, an LCCI consists in a dynamic Internet-scale hierarchy / constellation of interacting heterogeneous, inconsistent, and changing systems, which cooperate to perform critical functionalities. Many of the ideas behind LCCIs are incr [...]
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