o

reactivemongo.api

ChangeStreams

object ChangeStreams

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 ()
See also

reactivemongo.api.collections.GenericCollection.watch

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  1. sealed abstract class FullDocumentStrategy extends AnyRef

    Defines the lookup strategy of a change stream.

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  20. object FullDocumentStrategy

    FullDocumentStrategy utilities

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