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  • package root
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    root
  • package reactivemongo
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    root
  • package api
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    reactivemongo
  • object ChangeStreams

    Change stream utilities.

    Change stream utilities.

    import scala.concurrent.{ ExecutionContext, Future }

import reactivemongo.api.ChangeStreams.FullDocumentStrategy

import reactivemongo.api.bson.BSONDocument
import reactivemongo.api.bson.collection.BSONCollection

def peekNext(
  coll: BSONCollection,
  strategy: FullDocumentStrategy)(
  implicit ec: ExecutionContext): Future[Option[BSONDocument]] =
  coll.watch[BSONDocument](fullDocumentStrategy = Some(strategy)).
    cursor.headOption

def doIt(coll: BSONCollection)(
  implicit ec: ExecutionContext): Future[Unit] = for {
    _ <- peekNext(coll, FullDocumentStrategy.Default)
    _ <- peekNext(coll, FullDocumentStrategy.UpdateLookup)
  } yield ()
    Definition Classes
    api
    See also

    reactivemongo.api.collections.GenericCollection.watch

  • FullDocumentStrategy

object FullDocumentStrategy

FullDocumentStrategy utilities

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  20. case object Default extends FullDocumentStrategy with Product with Serializable

    Default lookup strategy.

    Default lookup strategy. Insert and Replace events contain the full document at the time of the event.

  21. case object UpdateLookup extends FullDocumentStrategy with Product with Serializable

    In this strategy, in addition to the default behavior, Update change events will be joined with the *current* version of the related document (which is thus not necessarily the value at the time of the event).

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