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Showing content from https://www.mongodb.com/docs/realm-sdks/swift/latest/Protocols/ChangeEventDelegate.html below:

ChangeEventDelegate Protocol Reference

public protocol ChangeEventDelegate : AnyObject

Delegate which is used for subscribing to changes on a MongoCollection.watch() stream.

• The stream was opened.

  Declaration

  Swift

  func changeStreamDidOpen(_ changeStream: ChangeStream)

  Parameters changeStream

  The ChangeStream subscribing to the stream changes.

• The stream has been closed.

  Declaration

  Swift

  func changeStreamDidClose(with error: Error?)

  Parameters error

  If an error occurred when closing the stream, an error will be passed.

• A error has occurred while streaming.

  Declaration

  Swift

  func changeStreamDidReceive(error: Error)

  Parameters error

  The streaming error.

• Invoked when a change event has been received.

  Declaration

  Swift

  func changeStreamDidReceive(changeEvent: AnyBSON?)

  Parameters changeEvent

  The change event in BSON format.

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