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c

org.mongodb.scala

MapReduceObservable

case class MapReduceObservable[TResult](wrapped: MapReducePublisher[TResult]) extends Observable[TResult] with Product with Serializable

Observable for map reduce.

Linear Supertypes
Serializable, Product, Equals, Observable[TResult], Publisher[TResult], AnyRef, Any
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  1. MapReduceObservable
  2. Serializable
  3. Product
  4. Equals
  5. Observable
  6. Publisher
  7. AnyRef
  8. Any
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Visibility
  1. Public
  2. Protected

Instance Constructors

  1. new MapReduceObservable(wrapped: MapReducePublisher[TResult])

Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##: Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  4. def action(action: MapReduceAction): MapReduceObservable[TResult]

    Specify the MapReduceAction to be used when writing to a collection.

    Specify the MapReduceAction to be used when writing to a collection.

    action

    an model.MapReduceAction to perform on the collection

    returns

    this

  5. def andThen[U](pf: PartialFunction[Try[TResult], U]): Observable[TResult]

    Applies the side-effecting function to the final result of this Observable and, returns a new Observable with the result of this Observable.

    Applies the side-effecting function to the final result of this Observable and, returns a new Observable with the result of this Observable.

    This method allows one to enforce that the callbacks are executed in a specified order.

    Note that if one of the chained andThen callbacks throws an exception, that exception is not propagated to the subsequent andThen callbacks. Instead, the subsequent andThen callbacks are given the original value of this Observable.

    The following example prints out 10:

    Observable(1 to 10) andThen {
     case r => sys.error("runtime exception")
    } andThen {
     case Success(x) => print(x)
     case Failure(t) => print("Failure")
    }
    U

    the result type of the

    pf

    the partial function to pattern match against

    returns

    an

    Definition Classes
    Observable
  6. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  7. def batchSize(batchSize: Int): MapReduceObservable[TResult]

    Sets the number of documents to return per batch.

    Sets the number of documents to return per batch.

    batchSize

    the batch size

    returns

    this

    Since

    2.7

  8. def bypassDocumentValidation(bypassDocumentValidation: Boolean): MapReduceObservable[TResult]

    Sets the bypass document level validation flag.

    Sets the bypass document level validation flag.

    Note:: This only applies when an $out stage is specified.

    output with an action

    bypassDocumentValidation

    If true, allows the write to opt-out of document level validation.

    returns

    this

    Since

    1.1

    Note

    Requires MongoDB 3.2 or greater

  9. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.CloneNotSupportedException]) @native() @HotSpotIntrinsicCandidate()
  10. def collation(collation: Collation): MapReduceObservable[TResult]

    Sets the collation options

    Sets the collation options

    collation

    the collation options to use

    returns

    this

    Since

    1.2

    Note

    A null value represents the server default.

    ,

    Requires MongoDB 3.4 or greater

  11. def collect[S](): SingleObservable[Seq[TResult]]

    Collects all the values of the Observable into a list and returns a new Observable with that list.

    Collects all the values of the Observable into a list and returns a new Observable with that list.

    Example:

    val listOfNumbers = Observable(1 to 100).collect()
    returns

    an Observable that emits a single item, the result of accumulator.

    Definition Classes
    Observable
    Note

    If the Observable is large then this will consume lots of memory! If the underlying Observable is infinite this Observable will never complete.

    See also

    Uses foldLeft underneath

  12. def collectionName(collectionName: String): MapReduceObservable[TResult]

    Sets the collectionName for the output of the MapReduce

    Sets the collectionName for the output of the MapReduce

    The default action is replace the collection if it exists, to change this use action.

    collectionName

    the name of the collection that you want the map-reduce operation to write its output.

    returns

    this

  13. def databaseName(databaseName: String): MapReduceObservable[TResult]

    Sets the name of the database to output into.

    Sets the name of the database to output into.

    output with an action

    databaseName

    the name of the database to output into.

    returns

    this

  14. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  15. def fallbackTo[U >: TResult](that: Observable[U]): Observable[U]

    Creates a new Observable which returns the results of this Observable, if there is an error, it will then fallback to returning the results of the alternative "that" Observable.

    Creates a new Observable which returns the results of this Observable, if there is an error, it will then fallback to returning the results of the alternative "that" Observable.

    If both Observables fail, the resulting Observable holds the throwable object of the first Observable.

    Example:

    val fallBackObservable = Observable(1 to 100) fallbackTo Observable(200 to 300)

    Ensuring results from a Single Observer

    fallbackTo can potentially emit results from either Observer. This often isn't desirable, so to ensure only a single Observable issues results combine with the collect method eg:

    val results = Observable(1 to 100).collect() fallbackTo Observable(200 to 300).collect()
    U

    the type of the returned Observable

    that

    the Observable to fallback to if this Observable fails

    returns

    an Observable that will fallback to the that Observable should this Observable complete with an onError.

    Definition Classes
    Observable
  16. def filter(filter: Bson): MapReduceObservable[TResult]

    Sets the query filter to apply to the query.

    Sets the query filter to apply to the query.

    Filter

    filter

    the filter to apply to the query.

    returns

    this

  17. def filter(predicate: (TResult) => Boolean): Observable[TResult]

    Creates a new Observable by filtering the value of the current Observable with a predicate.

    Creates a new Observable by filtering the value of the current Observable with a predicate.

    If the current Observable fails, then the resulting Observable also fails.

    Example:

    val oddValues = Observable(1 to 100) filter { _ % 2 == 1 }
    predicate

    the function that is applied to each result emitted if it matches that result is passes to the returned Observable

    returns

    an Observable only containing items matching that match the predicate

    Definition Classes
    Observable
  18. def finalizeFunction(finalizeFunction: String): MapReduceObservable[TResult]

    Sets the JavaScript function that follows the reduce method and modifies the output.

    Sets the JavaScript function that follows the reduce method and modifies the output.

    Requirements for the finalize Function

    finalizeFunction

    the JavaScript function that follows the reduce method and modifies the output.

    returns

    this

  19. def first(): SingleObservable[TResult]

    Helper to return a single observable limited to the first result.

    Helper to return a single observable limited to the first result.

    returns

    a single observable which will the first result.

    Since

    4.0

  20. def flatMap[S](mapFunction: (TResult) => Observable[S]): Observable[S]

    Creates a new Observable by applying a function to each emitted result of the Observable.

    Creates a new Observable by applying a function to each emitted result of the Observable. If the Observable calls errors then then the new Observable will also contain this exception.

    As each emitted item passed to onNext returns an Observable, we tightly control the requests to the parent Observable. The requested amount is then passed to the child Observable and only when that is completed does the parent become available for requesting more data.

    Example:

    def f = Observable(1 to 10)
    def g = Observable(100 to 100)
    val h = for {
      x: Int <- f // returns Observable(1 to 10)
      y: Int <- g // returns Observable(100 to 100)
    } yield x + y

    is translated to:

    f flatMap { (x: Int) => g map { (y: Int) => x + y } }
    S

    the resulting type of each item in the Observable

    mapFunction

    function that transforms a each result of the receiver into an Observable and passes each result of that Observable to the returned Observable.

    returns

    an Observable with transformed results and / or error.

    Definition Classes
    Observable
  21. def foldLeft[S](initialValue: S)(accumulator: (S, TResult) => S): SingleObservable[S]

    Creates a new Observable that contains the single result of the applied accumulator function.

    Creates a new Observable that contains the single result of the applied accumulator function.

    The first item emitted by the Observable is passed to the supplied accumulator function alongside the initial value, then all other emitted items are passed along with the previous result of the accumulator function.

    Example:

    val countingObservable = Observable(1 to 100) foldLeft(0)((v, i) => v + 1)
    initialValue

    the initial (seed) accumulator value

    accumulator

    an accumulator function to be invoked on each item emitted by the source Observable, the result of which will be used in the next accumulator call.

    returns

    an Observable that emits a single item, the result of accumulator.

    Definition Classes
    Observable
    Note

    If this function is used to collect results into a collection then it could use lots of memory! If the underlying Observable is infinite this Observable will never complete.

  22. def foreach[U](doOnEach: (TResult) => U): Unit

    Applies a function applied to each emitted result.

    Applies a function applied to each emitted result.

    Automatically requests all results

    U

    the resulting type after the transformation

    doOnEach

    the anonymous function applied to each emitted item

    Definition Classes
    Observable
  23. final def getClass(): Class[_ <: AnyRef]
    Definition Classes
    AnyRef → Any
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  24. def head(): Future[TResult]

    Returns the head of the Observable in a scala.concurrent.Future.

    Returns the head of the Observable in a scala.concurrent.Future.

    returns

    the head result of the Observable.

    Definition Classes
    Observable
  25. def headOption(): Future[Option[TResult]]

    Returns the head option of the Observable in a scala.concurrent.Future.

    Returns the head option of the Observable in a scala.concurrent.Future.

    returns

    the head option result of the Observable.

    Definition Classes
    Observable
    Since

    2.2

  26. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  27. def jsMode(jsMode: Boolean): MapReduceObservable[TResult]

    Sets the flag that specifies whether to convert intermediate data into BSON format between the execution of the map and reduce functions.

    Sets the flag that specifies whether to convert intermediate data into BSON format between the execution of the map and reduce functions. Defaults to false.

    mapReduce

    jsMode

    the flag that specifies whether to convert intermediate data into BSON format between the execution of the map and reduce functions

    returns

    jsMode

  28. def limit(limit: Int): MapReduceObservable[TResult]

    Sets the limit to apply.

    Sets the limit to apply.

    Limit

    limit

    the limit, which may be null

    returns

    this

  29. def map[S](mapFunction: (TResult) => S): Observable[S]

    Creates a new Observable by applying a function to each emitted result of the Observable.

    Creates a new Observable by applying a function to each emitted result of the Observable. If the Observable calls errors then then the new Observable will also contain this exception.

    Example:

    def f = Observable(1 to 10)
    def g = Observable(100 to 100)
    val h = for {
      x: Int <- f // returns Observable(1 to 10)
      y: Int <- g // returns Observable(100 to 100)
    } yield x + y

    is translated to:

    f flatMap { (x: Int) => g map { (y: Int) => x + y } }
    S

    the resulting type of each item in the Observable

    mapFunction

    function that transforms a each result of the receiver and passes the result to the returned Observable

    returns

    an Observable with transformed results and / or error.

    Definition Classes
    Observable
  30. def maxTime(duration: Duration): MapReduceObservable[TResult]

    Sets the maximum execution time on the server for this operation.

    Sets the maximum execution time on the server for this operation.

    Max Time

    duration

    the duration

    returns

    this

  31. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  32. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  33. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  34. def observeOn(context: ExecutionContext): Observable[TResult]

    Use a specific execution context for future operations

    Use a specific execution context for future operations

    context

    the execution context

    returns

    an Observable that uses the specified execution context

    Definition Classes
    Observable
  35. def productElementNames: Iterator[String]
    Definition Classes
    Product
  36. def recover[U >: TResult](pf: PartialFunction[Throwable, U]): Observable[U]

    Creates a new Observable that will handle any matching throwable that this Observable might contain.

    Creates a new Observable that will handle any matching throwable that this Observable might contain. If there is no match, or if this Observable contains a valid result then the new Observable will contain the same.

    Example:

    mongoExceptionObservable recover { case e: MongoException => 0 } // final result: 0
    mongoExceptionObservable recover { case e: NotFoundException => 0 } // result: exception
    U

    the type of the returned Observable

    pf

    the partial function used to pattern match against the onError throwable

    returns

    an Observable that will handle any matching throwable and not error.

    Definition Classes
    Observable
  37. def recoverWith[U >: TResult](pf: PartialFunction[Throwable, Observable[U]]): Observable[U]

    Creates a new Observable that will handle any matching throwable that this Observable might contain by assigning it a value of another Observable.

    Creates a new Observable that will handle any matching throwable that this Observable might contain by assigning it a value of another Observable.

    If there is no match, or if this Observable contains a valid result then the new Observable will contain the same result.

    Example:

    successfulObservable recoverWith { case e: ArithmeticException => observableB } // result: successfulObservable
    mongoExceptionObservable recoverWith { case t: Throwable => observableB } // result: observableB

    Ensuring results from a Single Observer

    recoverWith can potentially emit results from either Observer. This often isn't desirable, so to ensure only a single Observable issues results combine with the collect method eg:

    val results = Observable(1 to 100)
      .collect()
      .recoverWith({ case t: Throwable => Observable(200 to 300).collect() })
      .subscribe((i: Seq[Int]) => print(results))
    U

    the type of the returned Observable

    pf

    the partial function used to pattern match against the onError throwable

    returns

    an Observable that will handle any matching throwable and not error but recover with a new observable

    Definition Classes
    Observable
  38. def scope(scope: Bson): MapReduceObservable[TResult]

    Sets the global variables that are accessible in the map, reduce and finalize functions.

    Sets the global variables that are accessible in the map, reduce and finalize functions.

    mapReduce

    scope

    the global variables that are accessible in the map, reduce and finalize functions.

    returns

    this

  39. def sort(sort: Bson): MapReduceObservable[TResult]

    Sets the sort criteria to apply to the query.

    Sets the sort criteria to apply to the query.

    Sort

    sort

    the sort criteria, which may be null.

    returns

    this

  40. def subscribe(observer: Observer[_ >: TResult]): Unit

    Request Observable to start streaming data.

    Request Observable to start streaming data.

    This is a "factory method" and can be called multiple times, each time starting a new Subscription. Each Subscription will work for only a single Observer.

    If the Observable rejects the subscription attempt or otherwise fails it will signal the error via Observer.onError.

    observer

    the Observer that will consume signals from this Observable

    Definition Classes
    MapReduceObservableObservable
  41. def subscribe(doOnNext: (TResult) => Any, doOnError: (Throwable) => Any, doOnComplete: () => Any): Unit

    Subscribes to the Observable and requests Long.MaxValue.

    Subscribes to the Observable and requests Long.MaxValue.

    Uses the default or overridden onNext, onError, onComplete partial functions.

    doOnNext

    anonymous function to apply to each emitted element.

    doOnError

    anonymous function to apply if there is an error.

    doOnComplete

    anonymous function to apply on completion.

    Definition Classes
    Observable
  42. def subscribe(doOnError: (Throwable) => Any, doOnComplete: () => Any): Unit

    Subscribes to the Observable and requests Long.MaxValue.

    Subscribes to the Observable and requests Long.MaxValue.

    doOnError

    anonymous function to apply if there is an error.

    doOnComplete

    anonymous function to apply on completion.

    Definition Classes
    Observable
  43. def subscribe(doOnNext: (TResult) => Any, doOnError: (Throwable) => Any): Unit

    Subscribes to the Observable and requests Long.MaxValue.

    Subscribes to the Observable and requests Long.MaxValue.

    doOnNext

    anonymous function to apply to each emitted element.

    doOnError

    anonymous function to apply if there is an error.

    Definition Classes
    Observable
  44. def subscribe(doOnNext: (TResult) => Any): Unit

    Subscribes to the Observable and requests Long.MaxValue.

    Subscribes to the Observable and requests Long.MaxValue.

    doOnNext

    anonymous function to apply to each emitted element.

    Definition Classes
    Observable
  45. def subscribe(observer: Subscriber[_ >: TResult]): Unit

    Handles the automatic boxing of a Java Observable so it conforms to the interface.

    Handles the automatic boxing of a Java Observable so it conforms to the interface.

    observer

    the Observer that will consume signals from this Observable

    Definition Classes
    Observable → Publisher
    Note

    Users should not have to implement this method but rather use the Scala Observable.

  46. final def synchronized[T0](arg0: => T0): T0
    Definition Classes
    AnyRef
  47. def toCollection(): SingleObservable[Void]

    Aggregates documents to a collection according to the specified map-reduce function with the given options, which must specify a non-inline result.

    Aggregates documents to a collection according to the specified map-reduce function with the given options, which must specify a non-inline result.

    returns

    an empty Observable that indicates when the operation has completed Aggregation

  48. def transform[S](mapFunction: (TResult) => S, errorMapFunction: (Throwable) => Throwable): Observable[S]

    Creates a new Observable by applying the resultFunction function to each emitted result.

    Creates a new Observable by applying the resultFunction function to each emitted result. If there is an error and onError is called the errorFunction function is applied to the failed result.

    S

    the resulting type of each item in the Observable

    mapFunction

    function that transforms a each result of the receiver and passes the result to the returned Observable

    errorMapFunction

    function that transforms a failure of the receiver into a failure of the returned observer

    returns

    an Observable with transformed results and / or error.

    Definition Classes
    Observable
  49. def verbose(verbose: Boolean): MapReduceObservable[TResult]

    Sets whether to include the timing information in the result information.

    Sets whether to include the timing information in the result information.

    verbose

    whether to include the timing information in the result information.

    returns

    this

  50. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  51. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException]) @native()
  52. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  53. final def withFilter(p: (TResult) => Boolean): Observable[TResult]

    Used by for-comprehensions.

    Used by for-comprehensions.

    Definition Classes
    Observable
  54. val wrapped: MapReducePublisher[TResult]
  55. def zip[U](that: Observable[U]): Observable[(TResult, U)]

    Zips the values of this and that Observable, and creates a new Observable holding the tuple of their results.

    Zips the values of this and that Observable, and creates a new Observable holding the tuple of their results.

    If this Observable fails, the resulting Observable is failed with the throwable stored in this. Otherwise, if that Observable fails, the resulting Observable is failed with the throwable stored in that.

    It will only emit as many items as the number of items emitted by the source Observable that emits the fewest items.

    U

    the type of the that Observable

    that

    the Observable to zip with

    returns

    a new zipped Observable

    Definition Classes
    Observable

Deprecated Value Members

  1. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.Throwable]) @Deprecated
    Deprecated
  2. def nonAtomic(nonAtomic: Boolean): MapReduceObservable[TResult]

    Sets if the post-processing step will prevent MongoDB from locking the database.

    Sets if the post-processing step will prevent MongoDB from locking the database.

    Valid only with the MapReduceAction.MERGE or MapReduceAction.REDUCE actions.

    Output with an action

    nonAtomic

    if the post-processing step will prevent MongoDB from locking the database.

    returns

    this

    Annotations
    @deprecated
    Deprecated

    (Since version 4.1.0) This option will no longer be supported in MongoDB 4.4 as it will no longer hold a global or database level write lock

  3. def sharded(sharded: Boolean): MapReduceObservable[TResult]

    Sets if the output database is sharded

    Sets if the output database is sharded

    output with an action

    sharded

    if the output database is sharded

    returns

    this

    Annotations
    @deprecated
    Deprecated

    (Since version 4.1.0) This option will no longer be supported in MongoDB 4.4.

Inherited from Serializable

Inherited from Product

Inherited from Equals

Inherited from Observable[TResult]

Inherited from Publisher[TResult]

Inherited from AnyRef

Inherited from Any

Ungrouped