Abstract

In this paper, we present deadline-constraints causal order protocol respecting Δ based on P/S architecture for broadcast of real-time collaborative applications in social networks to guarantee causally ordered messages delivery from brokers to subscribers. Every broker disseminates a broadcast message with a 1-Scalar, the time-stamped information that represents the maximum gossip round, that is the deadline (lifetime) of the immediate message of it, to subscribers because all messages disseminated by brokers have the same lifetime (deadline) as the maximum number of gossip rounds.

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