Packages

c

cloudflow.spark

SparkStreamletLogic

abstract class SparkStreamletLogic extends StreamletLogic[SparkStreamletContext]

Provides an entry-point for defining the behavior of a SparkStreamlet. Overide the method buildStreamingQueries to build the collection of StreamingQuery that needs to run as part of the business logic for the SparkStreamlet.

Here's an example of how to provide a specialized implementation of SparkStreamletLogic as part of implementing a custom SparkStreamlet:

// new custom `SparkStreamlet`
object MySparkProcessor extends SparkStreamlet {
  // define inlets, outlets and shape

  // provide custom implementation of `SparkStreamletLogic`
  override def createLogic() = new SparkStreamletLogic {
    override def buildStreamingQueries = {
      val dataset = readStream(in)
      val outStream = dataset.select($"name").as[Simple]
      val query = writeStream(outStream, out, OutputMode.Append)
      Seq(query)
    }
  }
}
Linear Supertypes
StreamletLogic[SparkStreamletContext], Serializable, Serializable, AnyRef, Any
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  1. SparkStreamletLogic
  2. StreamletLogic
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Instance Constructors

  1. new SparkStreamletLogic()(implicit context: SparkStreamletContext)

Type Members

  1. implicit class StreamingQueryExtensions extends AnyRef

Abstract Value Members

  1. abstract def buildStreamingQueries: StreamletQueryExecution

    Derived classes need to override this method to provide a custom implementation of the logic to build a StreamletQueryExecution object containing one or more StreamingQuerys that need to be executed.

Concrete 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. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  5. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native() @HotSpotIntrinsicCandidate()
  6. final def config: Config
  7. implicit val context: SparkStreamletContext
    Definition Classes
    SparkStreamletLogic → StreamletLogic
  8. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  9. def equals(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  10. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  11. def getContext(): SparkStreamletContext
    Definition Classes
    SparkStreamletLogic → StreamletLogic
  12. final def getMountedPath(volumeMount: VolumeMount): Path

    The path mounted for a VolumeMount request from a streamlet.

    The path mounted for a VolumeMount request from a streamlet. In a clustered deployment, the mounted path will correspond to the requested mount path in the VolumeMount definition. In a local environment, this path will be replaced by a local folder.

    volumeMount

    the volumeMount declaration for which we want to obtain the mounted path.

    returns

    the path where the volume is mounted.

    Exceptions thrown

    [[cloudflow.streamlets.MountedPathUnavailableException MountedPathUnavailableException ]] in the case the path is not available.

  13. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  14. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  15. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  16. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  17. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  18. final def readStream[In](inPort: CodecInlet[In])(implicit encoder: Encoder[In], typeTag: scala.reflect.api.JavaUniverse.TypeTag[In]): Dataset[In]

    Read from inlet to generate a Dataset.

  19. final def session: SparkSession
  20. final def streamletRef: String
  21. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  22. def toString(): String
    Definition Classes
    AnyRef → Any
  23. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  24. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native()
  25. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  26. final def writeStream[Out](stream: Dataset[Out], outPort: CodecOutlet[Out], outputMode: OutputMode, optionalTrigger: Option[Trigger] = None)(implicit encoder: Encoder[Out], typeTag: scala.reflect.api.JavaUniverse.TypeTag[Out]): StreamingQuery

    Write a StreamingQuery into outlet using the specified OutputMode

Deprecated Value Members

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

Inherited from StreamletLogic[SparkStreamletContext]

Inherited from Serializable

Inherited from Serializable

Inherited from AnyRef

Inherited from Any

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