SubscriptionManifest

A subscription: one handler of a processor, named processor.function.

• derives names the commands a saga's handler may derive, any of its kinds: those its @Sends(derives) declares, else those its return type names (CommandRequest<X>, a list of them), empty when it returns Unit; null for a projection or a reactor. A wait chain may follow the saga's hop only into the contexts of these commands.

• rejected is set on an @OnRejected handler of a saga and on no other: the commands whose rejections it handles, the one its receipt's C names, or empty for any command the saga sends. Such a handler reads rejections, not state events: its source is empty and not read.

• committed is set on an @OnCommitted handler of a saga and on no other: the commands whose success receipts it handles, the one its receipt's C names, or empty for any command the saga sends. Like an @OnRejected handler, it reads receipts (isReceiptHandler), not state events. A handler of both receipts, annotated both, has both set.

• start is where a new subscription starts in the log: what @OnEvent(start) declares, else SubscriptionStart.defaultFor its kind and source; the host may configure another. Null on an @OnRejected or @OnCommitted handler, which reads no log.

• schedules names the commands a saga's handler may schedule, each by its full type name, as its @Sends(schedules) declares; null when it declares none, and always for a projection or a reactor.

• retry is the handler's own in-process retry budget, as its @Retry and its processor's declare it: null when neither does. The host's wow.subscriptions.[<context>.<name>].retry.* overrides it, setting by setting.

• job is the job of a saga's @OnSchedule handler: its subscription reads the context's built-in job aggregate <context>.schedule (source) and hands its job's ticks to the handler. Null for an @OnEvent handler.

• calls names the commands a saga's handler sends to another context with SagaContext.call, as its @Sends(calls) declares, each referred to as derives refers to a command; null when it declares none. A wait chain may follow the saga's hop into their contexts too, but they need no command topic: the node calls their gateways, at the addresses its host configures.

Fields may be added: pass the constructor's arguments by name.