org.apache.flink.runtime.state

Interface KeyedStateFactory

All Known Subinterfaces:

KeyedStateBackend<K>

All Known Implementing Classes:

AbstractKeyedStateBackend, HeapKeyedStateBackend, RocksDBKeyedStateBackend

public interface KeyedStateFactory

This factory produces concrete internal state objects.

Method Summary

Modifier and Type	Method and Description
default <N,SV,S extends State,IS extends S> IS	createInternalState(TypeSerializer<N> namespaceSerializer, StateDescriptor<S,SV> stateDesc) Creates and returns a new InternalKvState.
<N,SV,SEV,S extends State,IS extends S> IS	createInternalState(TypeSerializer<N> namespaceSerializer, StateDescriptor<S,SV> stateDesc, StateSnapshotTransformer.StateSnapshotTransformFactory<SEV> snapshotTransformFactory) Creates and returns a new InternalKvState.

Method Detail

createInternalState

@Nonnull
default <N,SV,S extends State,IS extends S> IS createInternalState(@Nonnull
                                                                            TypeSerializer<N> namespaceSerializer,
                                                                            @Nonnull
                                                                            StateDescriptor<S,SV> stateDesc)
                                                                     throws Exception

Creates and returns a new InternalKvState.

Type Parameters:

N - The type of the namespace.

SV - The type of the stored state value.

S - The type of the public API state.

IS - The type of internal state.

Parameters:

namespaceSerializer - TypeSerializer for the state namespace.

stateDesc - The StateDescriptor that contains the name of the state.

Throws:

Exception

createInternalState

@Nonnull
<N,SV,SEV,S extends State,IS extends S> IS createInternalState(@Nonnull
                                                                        TypeSerializer<N> namespaceSerializer,
                                                                        @Nonnull
                                                                        StateDescriptor<S,SV> stateDesc,
                                                                        @Nonnull
                                                                        StateSnapshotTransformer.StateSnapshotTransformFactory<SEV> snapshotTransformFactory)
                                                                 throws Exception

Creates and returns a new InternalKvState.

Type Parameters:

N - The type of the namespace.

SV - The type of the stored state value.

SEV - The type of the stored state value or entry for collection types (list or map).

S - The type of the public API state.

IS - The type of internal state.

Parameters:

namespaceSerializer - TypeSerializer for the state namespace.

stateDesc - The StateDescriptor that contains the name of the state.

snapshotTransformFactory - factory of state snapshot transformer.

Throws:

Exception