When Things go Wrong RESPONDING TO ADVERSE EVENTS

The hierarchical architecture is a straightforward extension of a centralized architecture. It only requires that the basic central server be modified to propa- gate any information that it receives (i.e., subscriptions, etc.) on to its “master” server. In fact, the server/server protocol we use within the hierarchical archi- tecture is exactly the same as the protocol described in Section 3 for commu- nication between the servers and the external clients of the event notification service. Thus, in terms of communication, a server is not distinguished from objects of interest or interested parties. In practice, this means that a server will receive subscriptions, advertisements, and notifications from its “client” servers,...
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When Things go Wrong RESPONDING TO ADVERSE EVENTS