feat(projection): pilot checkpointing behavior inside Projection.Apply#54
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feat(projection): pilot checkpointing behavior inside Projection.Apply#54
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Sometimes it's desirable to specify inside a Projection whether the message being consumed should be checkpointed or not.
Example: projecting messages to a Kafka topic using batching -- if a whole batch fails, but we already committed the batch events processed in the Projection, then we need manual intervention.
This PR adds the following modifications:
projection.Runnercreates some checkpointing information (*bool) and post it in the context forProjection.Applyto use it,projection.Checkpoint(ctx), where the context set byprojection.Runnerspecifies to checkpoint the current message if successful,projection.DoNotCheckpoint(ctx), as above but without checkpointing.