org.apache.flink.table.runtime.dataview

Class PerWindowStateDataViewStore

java.lang.Object

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

All Implemented Interfaces:

StateDataViewStore

public class PerWindowStateDataViewStore
extends Object
implements StateDataViewStore

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

Constructor Summary

Constructors

Constructor and Description
PerWindowStateDataViewStore(org.apache.flink.runtime.state.KeyedStateBackend<?> keyedStateBackend, org.apache.flink.api.common.typeutils.TypeSerializer<?> windowSerializer, org.apache.flink.api.common.functions.RuntimeContext runtimeContext)

Method Summary

Modifier and Type	Method and Description
org.apache.flink.api.common.functions.RuntimeContext	getRuntimeContext() Gets the context that contains information about the UDF's runtime, such as the parallelism of the function, the subtask index of the function, or the name of the of the task that executes the function.
<N,V> StateListView<N,V>	getStateListView(String stateName, org.apache.flink.table.dataview.ListViewTypeInfo<V> listViewTypeInfo) Creates a state list view.
<N,UK,UV> StateMapView<N,UK,UV>	getStateMapView(String stateName, org.apache.flink.table.dataview.MapViewTypeInfo<UK,UV> mapViewTypeInfo) 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(org.apache.flink.runtime.state.KeyedStateBackend<?> keyedStateBackend,
                                   org.apache.flink.api.common.typeutils.TypeSerializer<?> windowSerializer,
                                   org.apache.flink.api.common.functions.RuntimeContext runtimeContext)

Method Detail

getStateMapView

public <N,UK,UV> StateMapView<N,UK,UV> getStateMapView(String stateName,
                                                       org.apache.flink.table.dataview.MapViewTypeInfo<UK,UV> mapViewTypeInfo)
                                                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

UK - Type of the keys in the map state

UV - Type of the values in the map state

Parameters:

stateName - The name of underlying state of the map view

mapViewTypeInfo - The type of the map view

Returns:

a keyed map state

Throws:

Exception

getStateListView

public <N,V> StateListView<N,V> getStateListView(String stateName,
                                                 org.apache.flink.table.dataview.ListViewTypeInfo<V> listViewTypeInfo)
                                          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

V - Type of the elements in the list state

Parameters:

stateName - The name of underlying state of the list view

listViewTypeInfo - The type of the list view

Returns:

a keyed list state

Throws:

Exception

getRuntimeContext

public org.apache.flink.api.common.functions.RuntimeContext getRuntimeContext()

Description copied from interface: StateDataViewStore

Gets the context that contains information about the UDF's runtime, such as the parallelism of the function, the subtask index of the function, or the name of the of the task that executes the function.

Specified by:

getRuntimeContext in interface StateDataViewStore