org.apache.flink.runtime.state.heap

Class AbstractHeapMergingState<K,N,IN,OUT,SV,S extends State,SD extends StateDescriptor<S,?>>

java.lang.Object

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

org.apache.flink.runtime.state.heap.AbstractHeapMergingState<K,N,IN,OUT,SV,S,SD>

Type Parameters:

K - The type of the key.

N - The type of the namespace.

SV - The type of the values in the state.

S - The type of State

SD - The type of StateDescriptor for the State S

All Implemented Interfaces:

AppendingState<IN,OUT>, MergingState<IN,OUT>, State, InternalAppendingState<N,IN,OUT>, InternalKvState<N>, InternalMergingState<N,IN,OUT>

Direct Known Subclasses:

HeapAggregatingState, HeapListState, HeapReducingState

public abstract class AbstractHeapMergingState<K,N,IN,OUT,SV,S extends State,SD extends StateDescriptor<S,?>>
extends AbstractHeapState<K,N,SV,S,SD>
implements InternalMergingState<N,IN,OUT>

Base class for MergingState (InternalMergingState) that is stored on the heap.

Field Summary

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

currentNamespace, keySerializer, namespaceSerializer, stateDesc, stateTable

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractHeapMergingState(SD stateDesc, StateTable<K,N,SV> stateTable, TypeSerializer<K> keySerializer, TypeSerializer<N> namespaceSerializer) Creates a new key/value state for the given hash map of key/value pairs.

Method Summary

Methods

Modifier and Type	Method and Description
void	mergeNamespaces(N target, Collection<N> sources) Merges the state of the current key for the given source namespaces into the state of the target namespace.
protected abstract SV	mergeState(SV a, SV b)

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

clear, getSerializedValue, 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.InternalKvState

getSerializedValue, setCurrentNamespace

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

add, get

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

clear

Constructor Detail

AbstractHeapMergingState

protected AbstractHeapMergingState(SD stateDesc,
                        StateTable<K,N,SV> stateTable,
                        TypeSerializer<K> keySerializer,
                        TypeSerializer<N> namespaceSerializer)

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

Parameters:

stateDesc - The state identifier for the state. This contains name and can create a default state value.

stateTable - The state tab;e to use in this kev/value state. May contain initial state.

Method Detail

mergeNamespaces

public void mergeNamespaces(N target,
                   Collection<N> sources)
                     throws Exception

Description copied from interface: InternalMergingState

Merges the state of the current key for the given source namespaces into the state of the target namespace.

Specified by:

mergeNamespaces in interface InternalMergingState<N,IN,OUT>

Parameters:

target - The target namespace where the merged state should be stored.

sources - The source namespaces whose state should be merged.

Throws:

Exception - The method may forward exception thrown internally (by I/O or functions).

mergeState

protected abstract SV mergeState(SV a,
            SV b)
                          throws Exception

Throws:

Exception