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 def process(session: R2dbcSession, envelope: Envelope): Future[Done]
The
process
method is invoked for eachEnvelope
.The
process
method is invoked for eachEnvelope
. Each time a newConnection
is passed with a new open transaction. You can usecreateStatement
,update
and other methods provided by the R2dbcSession. The results of several statements can be combined withFuture
composition (e.g.flatMap
). The transaction will be automatically committed or rolled back when the returnedFuture[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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