BlockBasedSource.Block (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. After August 12, 2020, Dataflow will not run jobs using Dataflow 1.x and below. 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.io

Class BlockBasedSource.Block<T>

• java.lang.Object
• • com.google.cloud.dataflow.sdk.io.BlockBasedSource.Block<T>

• Enclosing class:

  BlockBasedSource<T>

  ---

  
  

  @Experimental(value=SOURCE_SINK)
  protected abstract static class BlockBasedSource.Block<T>
  extends Object

  A Block represents a block of records that can be read.

• • Constructor Summary

    Constructors 

    Modifier	Constructor and Description
    protected	Block()

  • Method Summary

    All Methods Instance Methods Abstract Methods 

    Modifier and Type	Method and Description
    abstract T	getCurrentRecord() Returns the current record.
    abstract double	getFractionOfBlockConsumed() Returns the fraction of the block already consumed, if possible, as a value in [0, 1].
    abstract boolean	readNextRecord() Reads the next record from the block and returns true iff one exists.

    • Methods inherited from class java.lang.Object

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

• • Constructor Detail

    • Block

      protected Block()

  • Method Detail

    • getCurrentRecord

      public abstract T getCurrentRecord()

      Returns the current record.

    • readNextRecord

      public abstract boolean readNextRecord()
                                      throws IOException

      Reads the next record from the block and returns true iff one exists.

      Throws:

      IOException

    • getFractionOfBlockConsumed

      public abstract double getFractionOfBlockConsumed()

      Returns the fraction of the block already consumed, if possible, as a value in [0, 1]. It should not include the current record. Successive results from this method must be monotonically increasing.

      If it is not possible to compute the fraction of the block consumed this method may return zero. For example, when the total number of records in the block is unknown.