org.apache.flink.runtime.state.heap

类 CopyOnWriteStateMapSnapshot<K,N,S>

java.lang.Object

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

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

类型参数:

K - type of key

N - type of namespace

S - type of state

public class CopyOnWriteStateMapSnapshot<K,N,S>
extends StateMapSnapshot<K,N,S,CopyOnWriteStateMap<K,N,S>>

This class represents the snapshot of a CopyOnWriteStateMap.

IMPORTANT: Please notice that snapshot integrity of entries in this class rely on proper copy-on-write semantics through the CopyOnWriteStateMap that created the snapshot object, but all objects in this snapshot must be considered as READ-ONLY!. The reason is that the objects held by this class may or may not be deep copies of original objects that may still used in the CopyOnWriteStateMap. This depends for each entry on whether or not it was subject to copy-on-write operations by the CopyOnWriteStateMap. Phrased differently: the CopyOnWriteStateMap provides copy-on-write isolation for this snapshot, but this snapshot does not isolate modifications from the CopyOnWriteStateMap!

字段概要

从类继承的字段 org.apache.flink.runtime.state.heap.StateMapSnapshot

owningStateMap

方法概要

限定符和类型	方法和说明
org.apache.flink.runtime.state.heap.CopyOnWriteStateMapSnapshot.SnapshotIterator<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	isReleased()
void	release() Release the snapshot.
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 org.apache.flink.runtime.state.heap.StateMapSnapshot

isOwner

从类继承的方法 java.lang.Object

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

方法详细资料

release

public void release()

从类复制的说明: StateMapSnapshot

Release the snapshot.

覆盖:

release 在类中 StateMapSnapshot<K,N,S,CopyOnWriteStateMap<K,N,S>>

isReleased

public boolean isReleased()

getIterator

public org.apache.flink.runtime.state.heap.CopyOnWriteStateMapSnapshot.SnapshotIterator<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)

指定者:

getIterator 在类中 StateMapSnapshot<K,N,S,CopyOnWriteStateMap<K,N,S>>

writeState

public 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

从类复制的说明: StateMapSnapshot

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

指定者:

writeState 在类中 StateMapSnapshot<K,N,S,CopyOnWriteStateMap<K,N,S>>

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.