Combine.BinaryCombineIntegerFn (Google Cloud Dataflow SDK 1.9.1 API)

Google Cloud Dataflow SDK for Java, version 1.9.1

com.google.cloud.dataflow.sdk.transforms

Class Combine.BinaryCombineIntegerFn

    • Constructor Detail

      • BinaryCombineIntegerFn

        public BinaryCombineIntegerFn()
    • Method Detail

      • apply

        public abstract int apply(int left,
                                  int right)
        Applies the binary operation to the two operands, returning the result.
      • identity

        public abstract int identity()
        Returns the identity element of this operation, i.e. an element e such that apply(e, x) == apply(x, e) == x for all values of x.
      • addInput

        public int[] addInput(int[] accumulator,
                              Integer input)
        Description copied from class: Combine.CombineFn
        Adds the given input value to the given accumulator, returning the new accumulator value.

        For efficiency, the input accumulator may be modified and returned.

        Specified by:
        addInput in class Combine.CombineFn<Integer,int[],Integer>
      • mergeAccumulators

        public int[] mergeAccumulators(Iterable<int[]> accumulators)
        Description copied from class: Combine.CombineFn
        Returns an accumulator representing the accumulation of all the input values accumulated in the merging accumulators.

        May modify any of the argument accumulators. May return a fresh accumulator, or may return one of the (modified) argument accumulators.

        Specified by:
        mergeAccumulators in class Combine.CombineFn<Integer,int[],Integer>
      • getAccumulatorCoder

        public Coder<int[]> getAccumulatorCoder(CoderRegistry registry,
                                                Coder<Integer> inputCoder)
        Description copied from interface: CombineFnBase.GlobalCombineFn
        Returns the Coder to use for accumulator AccumT values, or null if it is not able to be inferred.

        By default, uses the knowledge of the Coder being used for InputT values and the enclosing Pipeline's CoderRegistry to try to infer the Coder for AccumT values.

        This is the Coder used to send data through a communication-intensive shuffle step, so a compact and efficient representation may have significant performance benefits.

        Specified by:
        getAccumulatorCoder in interface CombineFnBase.GlobalCombineFn<Integer,int[],Integer>
      • getCounter

        public com.google.cloud.dataflow.sdk.util.common.Counter<Integer> getCounter(String name)
      • populateDisplayData

        public void populateDisplayData(DisplayData.Builder builder)
        Register display data for the given transform or component.

        populateDisplayData(DisplayData.Builder) is invoked by Pipeline runners to collect display data via DisplayData.from(HasDisplayData). Implementations may call super.populateDisplayData(builder) in order to register display data in the current namespace, but should otherwise use subcomponent.populateDisplayData(builder) to use the namespace of the subcomponent.

        By default, does not register any display data. Implementors may override this method to provide their own display data.

        Specified by:
        populateDisplayData in interface HasDisplayData
        Parameters:
        builder - The builder to populate with display data.
        See Also:
        HasDisplayData


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