abstract class 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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- R2dbcHandler.scala
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- new R2dbcHandler()
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- abstract def process(session: R2dbcSession, envelope: Envelope): CompletionStage[Done]
The
processmethod is invoked for eachEnvelope.The
processmethod is invoked for eachEnvelope. Each time a newConnectionis passed with a new open transaction. You can usecreateStatement,updateand other methods provided by the R2dbcSession. The results of several statements can be combined withCompletionStagecomposition (e.g.thenCompose). The transaction will be automatically committed or rolled back when the returnedCompletionStageis 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
CompletionStageis completed.- Annotations
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- def start(): CompletionStage[Done]
Invoked when the projection is starting, before first envelope is processed.
Invoked when the projection is starting, before first envelope is processed. Can be overridden to implement initialization. It is also called when the
Projectionis restarted after a failure.- Definition Classes
- R2dbcHandler → HandlerLifecycle
- def stop(): CompletionStage[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
- R2dbcHandler → HandlerLifecycle
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