Package org.apache.flink.datastream.impl.extension.window.context

Class WindowStateStore<K,W extends org.apache.flink.streaming.api.windowing.windows.Window>

java.lang.Object

org.apache.flink.datastream.impl.extension.window.context.WindowStateStore<K,W>

Type Parameters:

K - Type of the window key.

W - Type of the window.

public class WindowStateStore<K,W extends org.apache.flink.streaming.api.windowing.windows.Window>
extends Object

This class provides methods to store and retrieve state associated with windows in WindowContext.

Constructor Summary

Constructors

Constructor	Description
WindowStateStore(org.apache.flink.datastream.api.extension.window.function.WindowProcessFunction windowProcessFunction, org.apache.flink.runtime.asyncprocessing.operators.AbstractAsyncStateStreamOperator<?> operator, org.apache.flink.api.common.typeutils.TypeSerializer<W> windowSerializer, boolean isMergingWindow)

Method Summary

Modifier and Type	Method	Description
<T, ACC, OUT> Optional<org.apache.flink.api.common.state.v2.AggregatingState<T,OUT>>	getWindowState(org.apache.flink.api.common.state.AggregatingStateDeclaration<T,ACC,OUT> stateDeclaration, W namespace)	Retrieve window state of AggregatingState type.
<T> Optional<org.apache.flink.api.common.state.v2.ListState<T>>	getWindowState(org.apache.flink.api.common.state.ListStateDeclaration<T> stateDeclaration, W namespace)	Retrieve window state of list type.
<KEY, V> Optional<org.apache.flink.api.common.state.v2.MapState<KEY,V>>	getWindowState(org.apache.flink.api.common.state.MapStateDeclaration<KEY,V> stateDeclaration, W namespace)	Retrieve window state of map type.
<T> Optional<org.apache.flink.api.common.state.v2.ReducingState<T>>	getWindowState(org.apache.flink.api.common.state.ReducingStateDeclaration<T> stateDeclaration, W namespace)	Retrieve window state of ReducingState type.
<T> Optional<org.apache.flink.api.common.state.v2.ValueState<T>>	getWindowState(org.apache.flink.api.common.state.ValueStateDeclaration<T> stateDeclaration, W namespace)	Retrieve window state of value type.

Methods inherited from class java.lang.Object

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

Constructor Details

WindowStateStore

public WindowStateStore(org.apache.flink.datastream.api.extension.window.function.WindowProcessFunction windowProcessFunction,
 org.apache.flink.runtime.asyncprocessing.operators.AbstractAsyncStateStreamOperator<?> operator,
 org.apache.flink.api.common.typeutils.TypeSerializer<W> windowSerializer,
 boolean isMergingWindow)

Method Details

getWindowState

public <T>
Optional<org.apache.flink.api.common.state.v2.ListState<T>> getWindowState(org.apache.flink.api.common.state.ListStateDeclaration<T> stateDeclaration,
 W namespace)
                                                                    throws Exception

Retrieve window state of list type.

Throws:

Exception

getWindowState

public <KEY,
V>
Optional<org.apache.flink.api.common.state.v2.MapState<KEY,V>> getWindowState(org.apache.flink.api.common.state.MapStateDeclaration<KEY,V> stateDeclaration,
 W namespace)
                                                                       throws Exception

Retrieve window state of map type.

Throws:

Exception

getWindowState

public <T>
Optional<org.apache.flink.api.common.state.v2.ValueState<T>> getWindowState(org.apache.flink.api.common.state.ValueStateDeclaration<T> stateDeclaration,
 W namespace)
                                                                     throws Exception

Retrieve window state of value type.

Throws:

Exception

getWindowState

public <T>
Optional<org.apache.flink.api.common.state.v2.ReducingState<T>> getWindowState(org.apache.flink.api.common.state.ReducingStateDeclaration<T> stateDeclaration,
 W namespace)
                                                                        throws Exception

Retrieve window state of ReducingState type.

Throws:

Exception

getWindowState

public <T,
ACC,
OUT>
Optional<org.apache.flink.api.common.state.v2.AggregatingState<T,OUT>> getWindowState(org.apache.flink.api.common.state.AggregatingStateDeclaration<T,ACC,OUT> stateDeclaration,
 W namespace)
                                                                               throws Exception

Retrieve window state of AggregatingState type.

Throws:

Exception