ApproximateUnique.ApproximateUniqueCombineFn.LargestUnique (Google Cloud Dataflow SDK 1.9.1 API)

Google Cloud Dataflow SDK for Java, version 1.9.1

Warning: Dataflow SDK 1.x for Java is unsupported as of October 16, 2018. See Migrating from Dataflow SDK 1.x for Java for migration guidance.

Note: If you are using Cloud Dataflow SDK version 2.x, see the Apache Beam API reference documentation.

com.google.cloud.dataflow.sdk.transforms

Class ApproximateUnique.ApproximateUniqueCombineFn.LargestUnique

• java.lang.Object
• • com.google.cloud.dataflow.sdk.transforms.ApproximateUnique.ApproximateUniqueCombineFn.LargestUnique

• All Implemented Interfaces:

  Serializable

  Enclosing class:

  ApproximateUnique.ApproximateUniqueCombineFn<T>

  ---

  
  

  public static class ApproximateUnique.ApproximateUniqueCombineFn.LargestUnique
  extends Object
  implements Serializable

  A heap utility class to efficiently track the largest added elements.

  See Also:

  Serialized Form

• • Constructor Summary

    Constructors 

    Constructor and Description
    LargestUnique(long sampleSize) Creates a heap to track the largest sampleSize elements.

  • Method Summary

    All Methods Instance Methods Concrete Methods 

    Modifier and Type	Method and Description
    boolean	add(Long value) Adds a value to the heap, returning whether the value is (large enough to be) in the heap.
    List<Long>	extractOrderedList() Returns the values in the heap, ordered largest to smallest.

    • Methods inherited from class java.lang.Object

      clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

• • Constructor Detail

    • LargestUnique

      public LargestUnique(long sampleSize)

      Creates a heap to track the largest sampleSize elements.

      Parameters:

      sampleSize - the size of the heap

  • Method Detail

    • add

      public boolean add(Long value)

      Adds a value to the heap, returning whether the value is (large enough to be) in the heap.

    • extractOrderedList

      public List<Long> extractOrderedList()

      Returns the values in the heap, ordered largest to smallest.