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Data subscription events
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:
AfterAcknowledgment- invoked after the batch processed acknowledgment had been sent to the server,
AfterBatch- called after processing all docs from the batch.