trait DynamoDBTransactHandler[Envelope] extends HandlerLifecycle
Implement this interface for the Envelope handler for DynamoDB transactional 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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- DynamoDBTransactHandler.scala
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- abstract def process(envelope: Envelope): CompletionStage[Collection[TransactWriteItem]]
The
processmethod is invoked for eachEnvelope, and should return DynamoDBTransactWriteItems to atomically write along with the projection offset.The
processmethod is invoked for eachEnvelope, and should return DynamoDBTransactWriteItems to atomically write along with the projection offset.One envelope is processed at a time. It will not be invoked with the next envelope until the returned CompletionStage has completed and the given items written in a transaction.
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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.
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- DynamoDBTransactHandler → 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.
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- DynamoDBTransactHandler → HandlerLifecycle
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