An attachment driver provides low-level access to a replica's attachments. ReplicaAttachmentDrivers are not meant to be used directly by users; let the Replica talk to it for you.

A document driver provides low-level access to a replica's documents. ReplicaDocDrivers are not meant to be used directly by users; let the Replica talk to it for you.

A replica driver provides low-level access to a replica's documents and attachments. ReplicaDrivers are not meant to be used directly by users; let the Replica talk to it for you.

Options for configuring a new replica.

• validators: Validators for the kinds of documents this replica will replicate, e.g. FormatValidatorEs4.
• driver: A driver the replica will use to read and persist documents.

• IngestEventSuccess — a new doc was written
• IngestEventFailure — refused an invalid doc
• IngestEventNothingHappened — ingested an obsolete or duplicate doc

An event representing when a QuerySource has processed all existing documents.

• ExpireEvent - An ephemeral document has expired
• IngestEvent — the result of a replica ingesting a document
• DocAlreadyExists — processing an old doc as you catch up

A mode representing what kind of docs are desired from a query stream.

• existing - Only pre-existing documents.
• new - Only documents written after the stream is initiated
• everything - Both pre-existing and incoming documents.

• DocAlreadyExists — processing an old doc as you catch up
• IngestEvent — the result of a replica ingesting a document
• ExpireEvent - An ephemeral document has expired
• AttachmentIngestEvent - A new attachment has been ingested
• AttachmentPruneEvent - An attachment without a corresponding document has been pruned.
• ReplicaEventWillClose — the replica is about to close
• ReplicaEventDidClose — the replica has closed