Subscription Interceptor Proposal

HAPI FHIR JPA Server 3.7 currently provides a mechanism for registering interceptors with the FHIR Server endpoint.

Informed by unit test needs and end-user needs, this document proposes a similar interceptor mechanism for subscriptions.

Here are the proposed interception points:

SubscriptionMatchingSubscriber.matchActiveSubscriptionsAndDeliver(ResourceModifiedMessage theMsg)

1. boolean incomingResourcePreProcessed(ResourceModifiedMessage theMsg)
2. boolean subscriptionMatchBeforeDelivery(ResourceModifiedMessage theMsg, CanonicalSubscription theSubscription)
3. void incomingResourcePostProcessed(ResourceModifiedMessage theMsg)

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