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Realtime Paged Data Exchange Working Beta

This "beta" area contains suggestions for further improvements and features to the specification. Many are fit for initial implementation, and some have been transferred here from the original specification in order to focus the specification on the core feature set.

Transport

These transport options cover different levels of complexity and data volume. Note that in all cases polling must be implemented to support a full cache refresh and data download. The real-time transport mechanisms work alongside infrequent polling to keep the data current.

In the case of real time transport failure, a production client implementation can fall back to polling.

Transport Options	Advantages	Disadvantages	Primary Use Case
Polling (Simple download)	Simple to implement	Does not provide a real-time feed, and heuristic polling will result in patchy sync	Full cache refresh (also can be used in isolation for prototype implementation).
Webhooks (Real-time)	Less traffic than polling, more server-side control, allows for real-time, uses standard REST interface	Uses many high-latency connections	Basic production implementation
Server-Sent Events (Real-time)	Optimisation over webhooks as uses one connection, so can handle higher volume	Requires additional libraries	High volume production implementation
AMQP (Real-time)	Pages can be handed off to the queue to facilitate even higher volume than Server-Sent Events	Requires additional infrastructure	Very high volume production implementation