com.twitter.scalding

Mappable

trait Mappable[+T] extends Source with TypedSource[T]

Usually as soon as we open a source, we read and do some mapping operation on a single column or set of columns. T is the type of the single column. If doing multiple columns T will be a TupleN representing the types, e.g. (Int,Long,String)

Prefer to use TypedSource unless you are working with the fields API

NOTE: If we don't make this extend Source, established implicits are ambiguous when TDsl is in scope.

Linear Supertypes
typed.TypedSource[T], Source, Serializable, AnyRef, Any
Known Subclasses
CodecSource, DailySuffixTypedTsv, FixedPathTypedDelimited, FixedTypedText, HourlySuffixTypedTsv, IterableSource, Mappable1, Mappable10, Mappable11, Mappable12, Mappable13, Mappable14, Mappable15, Mappable16, Mappable17, Mappable18, Mappable19, Mappable2, Mappable20, Mappable21, Mappable22, Mappable3, Mappable4, Mappable5, Mappable6, Mappable7, Mappable8, Mappable9, MostRecentTypedText, MultipleTextLineFiles, OffsetTextLine, OptionalSource, PartitionSchemed, PartitionedDelimitedSource, PartitionedTextLine, SingleMappable, TextLine, TextLineScheme, TimePathTypedText, TypedDelimited, TypedSequenceFile, TypedTextDelimited
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  1. Mappable
  2. TypedSource
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Abstract Value Members

  1. abstract def converter[U >: T]: TupleConverter[U]

    Because TupleConverter cannot be covariant, we need to jump through this hoop.

    Because TupleConverter cannot be covariant, we need to jump through this hoop. A typical implementation might be: (implicit conv: TupleConverter[T]) and then:

    override def converter[U >: T] = TupleConverter.asSuperConverter[T, U](conv)

    Definition Classes
    TypedSource

  2. abstract def createTap(readOrWrite: AccessMode)(implicit mode: Mode): Tap[_, _, _]

    Subclasses of Source MUST override this method.

    Subclasses of Source MUST override this method. They may call out to TestTapFactory for making Taps suitable for testing.

    Definition Classes
    Source

Concrete Value Members

  1. final def !=(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef

  2. final def !=(arg0: Any): Boolean

    Definition Classes
    Any

  3. final def ##(): Int

    Definition Classes
    AnyRef → Any

  4. final def ==(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef

  5. final def ==(arg0: Any): Boolean

    Definition Classes
    Any

  6. def andThen[U](fn: (T) ⇒ U): typed.TypedSource[U]

    Transform this TypedSource into another by mapping after.

    Transform this TypedSource into another by mapping after. We don't call this map because of conflicts with Mappable, unfortunately

    Definition Classes
    TypedSource

  7. final def asInstanceOf[T0]: T0

    Definition Classes
    Any

  8. def checkFlowDefNotNull()(implicit flowDef: FlowDef, mode: Mode): Unit

    Attributes
    protected
    Definition Classes
    Source

  9. def clone(): AnyRef

    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

  10. final def eq(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef

  11. def equals(arg0: Any): Boolean

    Definition Classes
    AnyRef → Any

  12. def finalize(): Unit

    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )

  13. final def flatMapTo[U](out: Fields)(mf: (T) ⇒ TraversableOnce[U])(implicit flowDef: FlowDef, mode: Mode, setter: TupleSetter[U]): Pipe

    If you want to filter, you should use this and output a 0 or 1 length Iterable.

    If you want to filter, you should use this and output a 0 or 1 length Iterable. Filter does not change column names, and we generally expect to change columns here

  14. final def getClass(): Class[_]

    Definition Classes
    AnyRef → Any

  15. def hashCode(): Int

    Definition Classes
    AnyRef → Any

  16. final def isInstanceOf[T0]: Boolean

    Definition Classes
    Any

  17. final def mapTo[U](out: Fields)(mf: (T) ⇒ U)(implicit flowDef: FlowDef, mode: Mode, setter: TupleSetter[U]): Pipe

  18. final def ne(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef

  19. final def notify(): Unit

    Definition Classes
    AnyRef

  20. final def notifyAll(): Unit

    Definition Classes
    AnyRef

  21. def read(implicit flowDef: FlowDef, mode: Mode): Pipe

    Definition Classes
    Source

  22. def sourceFields: Fields

    Definition Classes
    TypedSource

  23. def sourceId: String

    This is a name the refers to this exact instance of the source (put another way, if s1.

    This is a name the refers to this exact instance of the source (put another way, if s1.sourceId == s2.sourceId, the job should work the same if one is replaced with the other

    Definition Classes
    Source

  24. final def synchronized[T0](arg0: ⇒ T0): T0

    Definition Classes
    AnyRef

  25. def toIterator(implicit config: Config, mode: Mode): Iterator[T]

    Allows you to read a Tap on the submit node NOT FOR USE IN THE MAPPERS OR REDUCERS.

    Allows you to read a Tap on the submit node NOT FOR USE IN THE MAPPERS OR REDUCERS. Typical use might be to read in Job.next to determine if another job is needed

  26. def toString(): String

    Definition Classes
    AnyRef → Any

  27. def transformForRead(pipe: Pipe): Pipe

    Attributes
    protected
    Definition Classes
    Source

  28. def transformForWrite(pipe: Pipe): Pipe

    Attributes
    protected
    Definition Classes
    Source

  29. def transformInTest: Boolean

    The mock passed in to scalding.

    The mock passed in to scalding.JobTest may be considered as a mock of the Tap or the Source. By default, as of 0.9.0, it is considered as a Mock of the Source. If you set this to true, the mock in TestMode will be considered to be a mock of the Tap (which must be transformed) and not the Source.

    Definition Classes
    Source

  30. def validateTaps(mode: Mode): Unit

    Definition Classes
    Source

  31. final def wait(): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

  32. final def wait(arg0: Long, arg1: Int): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

  33. final def wait(arg0: Long): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

  34. def writeFrom(pipe: Pipe)(implicit flowDef: FlowDef, mode: Mode): Pipe

    write the pipe but return the input so it can be chained into the next operation

    write the pipe but return the input so it can be chained into the next operation

    Definition Classes
    Source

Deprecated Value Members

  1. def readAtSubmitter[T](implicit mode: Mode, conv: TupleConverter[T]): Stream[T]

    Definition Classes
    Source
    Annotations
    @deprecated
    Deprecated

    (Since version 0.9.0) replace with Mappable.toIterator

Inherited from typed.TypedSource[T]

Inherited from Source

Inherited from Serializable

Inherited from AnyRef

Inherited from Any

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