Package org.apache.flink.table.runtime.dataview

Class PerWindowStateDataViewStore

java.lang.Object

org.apache.flink.table.runtime.dataview.PerWindowStateDataViewStore

All Implemented Interfaces:

StateDataViewStore

@Internal
public final class PerWindowStateDataViewStore
extends Object
implements StateDataViewStore

An implementation of StateDataViewStore for window aggregates which forwards the state registration to an underlying KeyedStateBackend. The created state by this store has the ability to switch window namespaces.

Constructor Summary

Constructors

Constructor	Description
PerWindowStateDataViewStore(KeyedStateBackend<?> keyedStateBackend, TypeSerializer<?> windowSerializer, RuntimeContext runtimeContext)

Method Summary

Modifier and Type	Method	Description
RuntimeContext	getRuntimeContext()
<N,EE> StateListView<N,EE>	getStateListView(String stateName, TypeSerializer<EE> elementSerializer)	Creates a state list view.
<N,EK,EV> StateMapView<N,EK,EV>	getStateMapView(String stateName, boolean supportNullKey, TypeSerializer<EK> keySerializer, TypeSerializer<EV> valueSerializer)	Creates a state map view.

Methods inherited from class java.lang.Object

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

Constructor Detail

PerWindowStateDataViewStore

public PerWindowStateDataViewStore(KeyedStateBackend<?> keyedStateBackend,
                                   TypeSerializer<?> windowSerializer,
                                   RuntimeContext runtimeContext)

Method Detail

getStateMapView

public <N,EK,EV> StateMapView<N,EK,EV> getStateMapView(String stateName,
                                                                               boolean supportNullKey,
                                                                               TypeSerializer<EK> keySerializer,
                                                                               TypeSerializer<EV> valueSerializer)
                                                                        throws Exception

Description copied from interface: StateDataViewStore

Creates a state map view.

Specified by:

getStateMapView in interface StateDataViewStore

Type Parameters:

N - Type of the namespace

EK - External type of the keys in the map state

EV - External type of the values in the map state

Parameters:

stateName - The name of underlying state of the map view

supportNullKey - Whether the null key should be supported

keySerializer - The key serializer

valueSerializer - The value serializer

Returns:

a keyed map state

Throws:

Exception

getStateListView

public <N,EE> StateListView<N,EE> getStateListView(String stateName,
                                                               TypeSerializer<EE> elementSerializer)
                                                        throws Exception

Description copied from interface: StateDataViewStore

Creates a state list view.

Specified by:

getStateListView in interface StateDataViewStore

Type Parameters:

N - Type of the namespace

EE - External type of the elements in the list state

Parameters:

stateName - The name of underlying state of the list view

elementSerializer - The element serializer

Returns:

a keyed list state

Throws:

Exception

getRuntimeContext

public RuntimeContext getRuntimeContext()

Specified by:

getRuntimeContext in interface StateDataViewStore