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This paper discusses how to add privacy features to the Janus WebRTC media server and gateway. In order to do so, we embrace a standard approach, by leveraging work currently ongoing within the IETF PERC working group. PERC stands for Privacy Enhanced RTP Conferencing and is aimed at enabling centralized real-time conferencing in a scenario where the central media forwarding entity is not required...
In this paper, we address reliability issues in three-tier systems with stateless application servers. For these systems, a framework called e-Transaction has been recently proposed, which specifies a set of desirable end-to-end reliability guarantees. In this article, we propose an innovative distributed protocol providing e-Transaction guarantees in the general case of multiple, autonomous back-end...
In this paper we face the challenging issue of defining and implementing an effective law for load balancing in Content Delivery Networks. We base our proposal on a formal study of a CDN system, carried out through the exploitation of a fluid flow model characterization of the network of servers. Starting from such characterization, we derive and prove a lemma about the network queues equilibrium...
APART (A Posteriori Active ReplicaTion) is a recently proposed active replication protocol specifically tailored for multi-tier data acquisition systems. It ensures consistency of middle-tier sink replicas by means of an a-posteriori synchronization phase based on reconciliation, which is activated only in case replicas react to an input message from the sensors by generating an output event destined...
This paper proposes APART (a posteriori active replication), a novel active replication protocol specifically tailored for multi-tier data acquisition systems. Unlike existing active replication solutions, APART does not rely on a-priori coordination schemes determining a same schedule of events across all the replicas, but it ensures replicas consistency by means of an a-posteriori reconciliation...
Multi-instance-precommit (MIP) has been recently presented as an innovative transaction management scheme in support of reliability for Atomic Transactions in multitier (e.g. Web-based) systems. With this scheme, fail-over of a previously activated transaction can be supported via simple retry logics, which do not require knowledge about whether, and on which sites, the original transaction was precommitted...
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