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trait R2dbcHandler[Envelope] extends HandlerLifecycle

Implement this interface for the Envelope handler for R2DBC Projections.

It can be stateful, with variables and mutable data structures. It is invoked by the Projection machinery one envelope at a time and visibility guarantees between the invocations are handled automatically, i.e. no volatile or other concurrency primitives are needed for managing the state.

Supported error handling strategies for when processing an Envelope fails can be defined in configuration or using the withRecoveryStrategy method of a Projection implementation.

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Abstract Value Members

  1. abstract def process(session: R2dbcSession, envelope: Envelope): Future[Done]

    The process method is invoked for each Envelope.

    The process method is invoked for each Envelope. Each time a new Connection is passed with a new open transaction. You can use createStatement, update and other methods provided by the R2dbcSession. The results of several statements can be combined with Future composition (e.g. flatMap). The transaction will be automatically committed or rolled back when the returned Future[Done] is completed.

    One envelope is processed at a time. It will not be invoked with the next envelope until after this method returns and the returned Future[Done] is completed.

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  15. def start(): Future[Done]
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  16. def stop(): Future[Done]
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