org.apache.flink.runtime.state.heap

Class StateMapSnapshot<K,N,S,T extends StateMap<K,N,S>>

java.lang.Object

org.apache.flink.runtime.state.heap.StateMapSnapshot<K,N,S,T>

Type Parameters:

K - type of key

N - type of namespace

S - type of state

Direct Known Subclasses:

CopyOnWriteSkipListStateMapSnapshot, CopyOnWriteStateMapSnapshot

public abstract class StateMapSnapshot<K,N,S,T extends StateMap<K,N,S>>
extends Object

Base class for snapshots of a StateMap.

Field Summary

Fields

Modifier and Type	Field and Description
protected T	owningStateMap The StateMap from which this snapshot was created.

Constructor Summary

Constructors

Constructor and Description
StateMapSnapshot(T stateMap)

Method Summary

Modifier and Type	Method and Description
abstract Iterator<StateEntry<K,N,S>>	getIterator(TypeSerializer<K> keySerializer, TypeSerializer<N> namespaceSerializer, TypeSerializer<S> stateSerializer, StateSnapshotTransformer<S> stateSnapshotTransformer)
boolean	isOwner(T stateMap) Returns true iff the given state map is the owner of this snapshot object.
void	release() Release the snapshot.
abstract void	writeState(TypeSerializer<K> keySerializer, TypeSerializer<N> namespaceSerializer, TypeSerializer<S> stateSerializer, DataOutputView dov, StateSnapshotTransformer<S> stateSnapshotTransformer) Writes the state in this snapshot to output.

Methods inherited from class java.lang.Object

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

Field Detail

owningStateMap

protected final T extends StateMap<K,N,S> owningStateMap

The StateMap from which this snapshot was created.

Constructor Detail

StateMapSnapshot

public StateMapSnapshot(T stateMap)

Method Detail

isOwner

public boolean isOwner(T stateMap)

Returns true iff the given state map is the owner of this snapshot object.

release

public void release()

Release the snapshot.

getIterator

public abstract Iterator<StateEntry<K,N,S>> getIterator(@Nonnull
                                                        TypeSerializer<K> keySerializer,
                                                        @Nonnull
                                                        TypeSerializer<N> namespaceSerializer,
                                                        @Nonnull
                                                        TypeSerializer<S> stateSerializer,
                                                        @Nullable
                                                        StateSnapshotTransformer<S> stateSnapshotTransformer)

writeState

public abstract void writeState(TypeSerializer<K> keySerializer,
                                TypeSerializer<N> namespaceSerializer,
                                TypeSerializer<S> stateSerializer,
                                @Nonnull
                                DataOutputView dov,
                                @Nullable
                                StateSnapshotTransformer<S> stateSnapshotTransformer)
                         throws IOException

Writes the state in this snapshot to output. The state need to be transformed with the given transformer if the transformer is non-null.

Parameters:

keySerializer - the key serializer.

namespaceSerializer - the namespace serializer.

stateSerializer - the state serializer.

dov - the output.

stateSnapshotTransformer - state transformer, and can be null.

Throws:

IOException - on write-related problems.