org.apache.flink.streaming.python.api.datastream

Class PythonKeyedStream

java.lang.Object

org.apache.flink.streaming.python.api.datastream.PythonDataStream<org.apache.flink.streaming.api.datastream.KeyedStream<org.python.core.PyObject,PyKey>>

org.apache.flink.streaming.python.api.datastream.PythonKeyedStream

@Public
public class PythonKeyedStream
extends PythonDataStream<org.apache.flink.streaming.api.datastream.KeyedStream<org.python.core.PyObject,PyKey>>

A thin wrapper layer over KeyedStream.

A PythonKeyedStream represents a PythonDataStream on which operator state is partitioned by key using a provided KeySelector.

Field Summary

Fields inherited from class org.apache.flink.streaming.python.api.datastream.PythonDataStream

stream

Method Summary

Modifier and Type	Method and Description
PythonWindowedStream	count_window(long size, long slide) A thin wrapper layer over KeyedStream.countWindow(long, long).
PythonSingleOutputStreamOperator	reduce(org.apache.flink.api.common.functions.ReduceFunction<org.python.core.PyObject> reducer) A thin wrapper layer over KeyedStream.reduce(ReduceFunction).
PythonWindowedStream	time_window(org.apache.flink.streaming.api.windowing.time.Time size) A thin wrapper layer over KeyedStream.timeWindow(Time).
PythonWindowedStream	time_window(org.apache.flink.streaming.api.windowing.time.Time size, org.apache.flink.streaming.api.windowing.time.Time slide) A thin wrapper layer over KeyedStream.timeWindow(Time, Time).

Methods inherited from class org.apache.flink.streaming.python.api.datastream.PythonDataStream

add_sink, filter, flat_map, iterate, iterate, key_by, map, output, split, union, write_as_text, write_as_text, write_to_socket

Methods inherited from class java.lang.Object

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

Method Detail

count_window

public PythonWindowedStream count_window(long size,
                                         long slide)

A thin wrapper layer over KeyedStream.countWindow(long, long).

Parameters:

size - The size of the windows in number of elements.

slide - The slide interval in number of elements.

Returns:

The python windowed stream PythonWindowedStream

time_window

public PythonWindowedStream time_window(org.apache.flink.streaming.api.windowing.time.Time size)

A thin wrapper layer over KeyedStream.timeWindow(Time).

Parameters:

size - The size of the window.

Returns:

The python windowed stream PythonWindowedStream

time_window

public PythonWindowedStream time_window(org.apache.flink.streaming.api.windowing.time.Time size,
                                        org.apache.flink.streaming.api.windowing.time.Time slide)

A thin wrapper layer over KeyedStream.timeWindow(Time, Time).

Parameters:

size - The size of the window.

Returns:

The python wrapper PythonWindowedStream

reduce

public PythonSingleOutputStreamOperator reduce(org.apache.flink.api.common.functions.ReduceFunction<org.python.core.PyObject> reducer)
                                        throws IOException

A thin wrapper layer over KeyedStream.reduce(ReduceFunction).

Parameters:

reducer - The ReduceFunction that will be called for every element of the input values with the same key.

Returns:

The transformed data stream @{link PythonSingleOutputStreamOperator}.

Throws:

IOException