abstract class StatefulHandler[State, Envelope] extends Handler[Envelope]
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- StatefulHandler.scala
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- new StatefulHandler()(implicit ec: ExecutionContext)
Abstract Value Members
- abstract def initialState(): Future[State]
Invoked to load the initial state when the projection is started or if previous
processfailed. - abstract def process(state: State, envelope: Envelope): Future[State]
The
processmethod is invoked for eachEnvelope.The
processmethod is invoked for eachEnvelope. One envelope is processed at a time. The returnedFuture[State]is to be completed when the processing of theenvelopehas finished. It will not be invoked with the next envelope until after the returnedFuturehas been completed.The
stateis the completed value of the previously returnedFuture[State]or theinitialState. If the previously returnedFuture[State]failed it will callinitialStateagain and use that value.
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- final def process(envelope: Envelope): Future[Done]
Calls
process(state, envelope)with the completed value of the previously returnedFuture[State]or theinitialState.Calls
process(state, envelope)with the completed value of the previously returnedFuture[State]or theinitialState. If the previously returnedFuture[State]failed it will callinitialStateagain and use that value.- Definition Classes
- StatefulHandler → Handler
- final def start(): Future[Done]
Calls StatefulHandler.initialState when the projection is started.
Calls StatefulHandler.initialState when the projection is started.
- Definition Classes
- StatefulHandler → HandlerLifecycle
- def stop(): Future[Done]
Invoked when the projection has been stopped.
Invoked when the projection has been stopped. Can be overridden to implement resource cleanup. It is also called when the
Projectionis restarted after a failure.- Definition Classes
- HandlerLifecycle
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