org.apache.flink.state.api.output.partitioner

Class HashSelector<IN>

java.lang.Object

org.apache.flink.state.api.output.partitioner.HashSelector<IN>

Type Parameters:

IN - Type of objects to extract the key from.

All Implemented Interfaces:

Serializable, Function, KeySelector<IN,Integer>

Deprecated.

@Deprecated
 @Internal
public class HashSelector<IN>
extends Object
implements KeySelector<IN,Integer>

A wrapper around a KeySelector that returns the Object.hashCode() of the returned key.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
HashSelector(KeySelector<IN,?> keySelector) Deprecated.

Method Summary

Modifier and Type	Method and Description
Integer	getKey(IN value) Deprecated. User-defined function that deterministically extracts the key from an object.

Methods inherited from class java.lang.Object

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

Constructor Detail

HashSelector

public HashSelector(KeySelector<IN,?> keySelector)

Deprecated.

Method Detail

getKey

public Integer getKey(IN value)
               throws Exception

Deprecated.

Description copied from interface: KeySelector

User-defined function that deterministically extracts the key from an object.

For example for a class:

        public class Word {
                String word;
                int count;
        }
 

The key extractor could return the word as a key to group all Word objects by the String they contain.

The code would look like this

        public String getKey(Word w) {
                return w.word;
        }
 

Specified by:

getKey in interface KeySelector<IN,Integer>

Parameters:

value - The object to get the key from.

Returns:

The extracted key.

Throws:

Exception - Throwing an exception will cause the execution of the respective task to fail, and trigger recovery or cancellation of the program.