org.apache.flink.runtime.state.heap

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

java.lang.Object

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

类型参数:

K - type of key

N - type of namespace

S - type of state

直接已知子类:

CopyOnWriteStateMapSnapshot

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

Base class for snapshots of a StateMap.

字段概要

字段

限定符和类型	字段和说明
protected T	owningStateMap The StateMap from which this snapshot was created.

构造器概要

构造器

构造器和说明
StateMapSnapshot(T stateMap)

方法概要

限定符和类型	方法和说明
abstract Iterator<StateEntry<K,N,S>>	getIterator(org.apache.flink.api.common.typeutils.TypeSerializer<K> keySerializer, org.apache.flink.api.common.typeutils.TypeSerializer<N> namespaceSerializer, org.apache.flink.api.common.typeutils.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(org.apache.flink.api.common.typeutils.TypeSerializer<K> keySerializer, org.apache.flink.api.common.typeutils.TypeSerializer<N> namespaceSerializer, org.apache.flink.api.common.typeutils.TypeSerializer<S> stateSerializer, org.apache.flink.core.memory.DataOutputView dov, StateSnapshotTransformer<S> stateSnapshotTransformer) Writes the state in this snapshot to output.

从类继承的方法 java.lang.Object

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

字段详细资料

owningStateMap

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

The StateMap from which this snapshot was created.

构造器详细资料

StateMapSnapshot

public StateMapSnapshot(T stateMap)

方法详细资料

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
                                                        org.apache.flink.api.common.typeutils.TypeSerializer<K> keySerializer,
                                                        @Nonnull
                                                        org.apache.flink.api.common.typeutils.TypeSerializer<N> namespaceSerializer,
                                                        @Nonnull
                                                        org.apache.flink.api.common.typeutils.TypeSerializer<S> stateSerializer,
                                                        @Nullable
                                                        StateSnapshotTransformer<S> stateSnapshotTransformer)

writeState

public abstract void writeState(org.apache.flink.api.common.typeutils.TypeSerializer<K> keySerializer,
                                org.apache.flink.api.common.typeutils.TypeSerializer<N> namespaceSerializer,
                                org.apache.flink.api.common.typeutils.TypeSerializer<S> stateSerializer,
                                @Nonnull
                                org.apache.flink.core.memory.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.

参数:

keySerializer - the key serializer.

namespaceSerializer - the namespace serializer.

stateSerializer - the state serializer.

dov - the output.

stateSnapshotTransformer - state transformer, and can be null.

抛出:

IOException - on write-related problems.