org.apache.flink.runtime.state.heap

Class HeapReducingState<K,N,V>

java.lang.Object

org.apache.flink.runtime.state.heap.AbstractHeapState<K,N,SV,S>

org.apache.flink.runtime.state.heap.AbstractHeapMergingState<K,N,V,V,V,org.apache.flink.api.common.state.ReducingState<V>>

org.apache.flink.runtime.state.heap.HeapReducingState<K,N,V>

Type Parameters:

K - The type of the key.

N - The type of the namespace.

V - The type of the value.

All Implemented Interfaces:

org.apache.flink.api.common.state.AppendingState<V,V>, org.apache.flink.api.common.state.MergingState<V,V>, org.apache.flink.api.common.state.ReducingState<V>, org.apache.flink.api.common.state.State, InternalAppendingState<K,N,V,V,V>, InternalKvState<K,N,V>, InternalMergingState<K,N,V,V,V>, InternalReducingState<K,N,V>

public class HeapReducingState<K,N,V>
extends AbstractHeapMergingState<K,N,V,V,V,org.apache.flink.api.common.state.ReducingState<V>>
implements InternalReducingState<K,N,V>

Heap-backed partitioned ReducingState that is snapshotted into files.

Field Summary

Fields inherited from class org.apache.flink.runtime.state.heap.AbstractHeapState

currentNamespace, keySerializer, namespaceSerializer, stateTable, valueSerializer

Constructor Summary

Constructors

Constructor and Description

HeapReducingState(StateTable<K,N,V> stateTable, org.apache.flink.api.common.typeutils.TypeSerializer<K> keySerializer, org.apache.flink.api.common.typeutils.TypeSerializer<V> valueSerializer, org.apache.flink.api.common.typeutils.TypeSerializer<N> namespaceSerializer, V defaultValue, org.apache.flink.api.common.functions.ReduceFunction<V> reduceFunction) Creates a new key/value state for the given hash map of key/value pairs.

Method Summary

Modifier and Type	Method and Description
void	add(V value)
V	get()
org.apache.flink.api.common.typeutils.TypeSerializer<K>	getKeySerializer() Returns the TypeSerializer for the type of key this state is associated to.
org.apache.flink.api.common.typeutils.TypeSerializer<N>	getNamespaceSerializer() Returns the TypeSerializer for the type of namespace this state is associated to.
org.apache.flink.api.common.typeutils.TypeSerializer<V>	getValueSerializer() Returns the TypeSerializer for the type of value this state holds.
protected V	mergeState(V a, V b)

Methods inherited from class org.apache.flink.runtime.state.heap.AbstractHeapMergingState

mergeNamespaces

Methods inherited from class org.apache.flink.runtime.state.heap.AbstractHeapState

clear, getDefaultValue, getSerializedValue, getStateTable, setCurrentNamespace

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.flink.runtime.state.internal.InternalMergingState

mergeNamespaces

Methods inherited from interface org.apache.flink.runtime.state.internal.InternalKvState

getSerializedValue, setCurrentNamespace

Methods inherited from interface org.apache.flink.api.common.state.State

clear

Constructor Detail

HeapReducingState

public HeapReducingState(StateTable<K,N,V> stateTable,
                         org.apache.flink.api.common.typeutils.TypeSerializer<K> keySerializer,
                         org.apache.flink.api.common.typeutils.TypeSerializer<V> valueSerializer,
                         org.apache.flink.api.common.typeutils.TypeSerializer<N> namespaceSerializer,
                         V defaultValue,
                         org.apache.flink.api.common.functions.ReduceFunction<V> reduceFunction)

Creates a new key/value state for the given hash map of key/value pairs.

Parameters:

stateTable - The state table for which this state is associated to.

keySerializer - The serializer for the keys.

valueSerializer - The serializer for the state.

namespaceSerializer - The serializer for the namespace.

defaultValue - The default value for the state.

reduceFunction - The reduce function used for reducing state.

Method Detail

getKeySerializer

public org.apache.flink.api.common.typeutils.TypeSerializer<K> getKeySerializer()

Description copied from interface: InternalKvState

Returns the TypeSerializer for the type of key this state is associated to.

Specified by:

getKeySerializer in interface InternalKvState<K,N,V>

getNamespaceSerializer

public org.apache.flink.api.common.typeutils.TypeSerializer<N> getNamespaceSerializer()

Description copied from interface: InternalKvState

Returns the TypeSerializer for the type of namespace this state is associated to.

Specified by:

getNamespaceSerializer in interface InternalKvState<K,N,V>

getValueSerializer

public org.apache.flink.api.common.typeutils.TypeSerializer<V> getValueSerializer()

Description copied from interface: InternalKvState

Returns the TypeSerializer for the type of value this state holds.

Specified by:

getValueSerializer in interface InternalKvState<K,N,V>

get

public V get()

Specified by:

get in interface org.apache.flink.api.common.state.AppendingState<V,V>

add

public void add(V value)
         throws IOException

Specified by:

add in interface org.apache.flink.api.common.state.AppendingState<V,V>

Throws:

IOException

mergeState

protected V mergeState(V a,
                       V b)
                throws Exception

Specified by:

mergeState in class AbstractHeapMergingState<K,N,V,V,V,org.apache.flink.api.common.state.ReducingState<V>>

Throws:

Exception