Package org.apache.flink.runtime.operators.hash

Class InPlaceMutableHashTable.HashTableProber<PT>

java.lang.Object
org.apache.flink.runtime.operators.hash.AbstractHashTableProber<PT,T>
org.apache.flink.runtime.operators.hash.InPlaceMutableHashTable.HashTableProber<PT>
Type Parameters:
PT - The type of the records that we are probing with
Enclosing class:
InPlaceMutableHashTable<T>
public final class InPlaceMutableHashTable.HashTableProber<PT> extends AbstractHashTableProber<PT,T>
A prober for accessing the table. In addition to getMatchFor and updateMatch, it also has insertAfterNoMatch. Warning: Don't modify the table between calling getMatchFor and the other methods!

  • Constructor Details

    • HashTableProber

      public HashTableProber(org.apache.flink.api.common.typeutils.TypeComparator<PT> probeTypeComparator, org.apache.flink.api.common.typeutils.TypePairComparator<PT,T> pairComparator)

  • Method Details

    • getMatchFor

      public T getMatchFor(PT record, T targetForMatch)
      Searches the hash table for the record with the given key. (If there would be multiple matches, only one is returned.)
      Specified by:
      getMatchFor in class AbstractHashTableProber<PT,T>
      Parameters:
      record - The record whose key we are searching for
      targetForMatch - If a match is found, it will be written here
      Returns:
      targetForMatch if a match is found, otherwise null.

    • getMatchFor

      public T getMatchFor(PT probeSideRecord)
      Specified by:
      getMatchFor in class AbstractHashTableProber<PT,T>

    • updateMatch

      public void updateMatch(T newRecord) throws IOException
      This method can be called after getMatchFor returned a match. It will overwrite the record that was found by getMatchFor. Warning: The new record should have the same key as the old! WARNING; Don't do any modifications to the table between getMatchFor and updateMatch!
      Specified by:
      updateMatch in class AbstractHashTableProber<PT,T>
      Parameters:
      newRecord - The record to override the old record with.
      Throws:
      IOException - (EOFException specifically, if memory ran out)

    • insertAfterNoMatch

      public void insertAfterNoMatch(T record) throws IOException
      This method can be called after getMatchFor returned null. It inserts the given record to the hash table. Important: The given record should have the same key as the record that was given to getMatchFor! WARNING; Don't do any modifications to the table between getMatchFor and insertAfterNoMatch!
      Throws:
      IOException - (EOFException specifically, if memory ran out)