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Title : Event Notification Protocol - ENP Author(s) : S. Reddy, M. Fisher Filename : draft-reddy-enp-protocol-00.txt Pages : 21 Date : 15-Jun-98 As the complexity of distributed applications increases, an increasing amount of processing is done using distributed processes, which typically execute without the direct supervision of an end user. The user must poll these processes periodically to check if they are completed successfully or not. This polling results in unnecessary wastage of network bandwidth as well as computing resources. The user generally cannot see intermediate results or progress reports for long running processes, they must wait till the process is completely finished before viewing the results. Thus the problem of monitoring events is central in distributed applications and protocols. A repeated need in such applications is receive notifications when a resource property value changes or event state changes. Current database systems provides mechanisms like constraints, triggers and active database rules. These facilities provides an automated means to ensure the database integrity or perform specific action when data changes. Need for such kind of requirement is fundamental is network applications. Event Notification Protocol(ENP) abstracts the notification requirements from the applications. ENP provides a lean and mean protocol with a client side semantics for processing notifications. The goal of ENP is to provide a service which allows users to select resources or events for which they wish to be notified in case changes of property values or state values occur. The Event Notification Protocol will also allow users to define what events or state changes they are interested in. This document describes the Event Notification Protocol. The objective is to provide a simple, scalable and highly efficient notification protocol while also providing the appropriate flexibility to meet the needs of both the internet and enterprise environments.
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