Data subscription events
The Subscription
instance exposes a few events which allow to provide control over the data stream. There are four subscription events that you can hook up:
public delegate void BeforeBatch();
public delegate bool BeforeAcknowledgment();
public delegate void AfterAcknowledgment(Etag lastProcessedEtag);
public delegate void AfterBatch(int documentsProcessed);
Each of them is invoked on a different level of documents processing:
BeforeBatch
- called when a first document from the batch is about to be processed by handlers, if the batch is empty then the event is not raised,BeforeAcknowledgment
- triggered after processing all documents in batch, the returned value determines if the batch can be acknowledged (default:true
),AfterAcknowledgment
- invoked after the batch processed acknowledgment had been sent to the server,AfterBatch
- called after processing all docs from the batch.