org.apache.flink.streaming.python.api.functions

Class PythonKeySelector

java.lang.Object

org.apache.flink.streaming.python.api.functions.PythonKeySelector

All Implemented Interfaces:

Serializable, org.apache.flink.api.common.functions.Function, org.apache.flink.api.java.functions.KeySelector<org.python.core.PyObject,PyKey>

public class PythonKeySelector
extends Object
implements org.apache.flink.api.java.functions.KeySelector<org.python.core.PyObject,PyKey>

The PythonKeySelector is a thin wrapper layer over a Python UDF KeySelector. It receives a KeySelector as an input and keeps it internally in a serialized form. It is then delivered, as part of the job graph, up to the TaskManager, then it is opened and becomes a sort of mediator to the Python UDF KeySelector.

This function is used internally by the Python thin wrapper layer over the streaming data functionality

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
PythonKeySelector(org.apache.flink.api.java.functions.KeySelector<org.python.core.PyObject,PyKey> fun)

Method Summary

Modifier and Type	Method and Description
PyKey	getKey(org.python.core.PyObject value)

Methods inherited from class java.lang.Object

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

Constructor Detail

PythonKeySelector

public PythonKeySelector(org.apache.flink.api.java.functions.KeySelector<org.python.core.PyObject,PyKey> fun)
                  throws IOException

Throws:

IOException

Method Detail

getKey

public PyKey getKey(org.python.core.PyObject value)
             throws Exception

Specified by:

getKey in interface org.apache.flink.api.java.functions.KeySelector<org.python.core.PyObject,PyKey>

Throws:

Exception