Package org.apache.flink.streaming.runtime.operators.windowing

Interface KeyMap.TraversalEvaluator<K,V>

Type Parameters:
K - The type of the key.
V - The type of the value.
Enclosing class:
KeyMap<K,V>
public static interface KeyMap.TraversalEvaluator<K,V>
A visitor for a traversal over the union of multiple hash maps. The visitor is called for each key in the union of the maps and all values associated with that key (one per map, but multiple across maps).

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    keyDone()
    Called when the traversal for the current key is complete.
    void
    nextValue(V value)
    Called for each value found for the current key.
    void
    startNewKey(K key)
    Called whenever the traversal starts with a new key.

  • Method Details

    • startNewKey

      void startNewKey(K key) throws Exception
      Called whenever the traversal starts with a new key.
      Parameters:
      key - The key traversed.
      Throws:
      Exception - Method forwards all exceptions.

    • nextValue

      void nextValue(V value) throws Exception
      Called for each value found for the current key.
      Parameters:
      value - The next value.
      Throws:
      Exception - Method forwards all exceptions.

    • keyDone

      void keyDone() throws Exception
      Called when the traversal for the current key is complete.
      Throws:
      Exception - Method forwards all exceptions.