Package org.apache.flink.runtime.state

Class StateSnapshotTransformers.ListStateSnapshotTransformer<T>

java.lang.Object

org.apache.flink.runtime.state.StateSnapshotTransformers.ListStateSnapshotTransformer<T>

All Implemented Interfaces:

StateSnapshotTransformer<List<T>>

Enclosing class:

StateSnapshotTransformers

public static class StateSnapshotTransformers.ListStateSnapshotTransformer<T>
extends Object
implements StateSnapshotTransformer<List<T>>

General implementation of list state transformer.

This transformer wraps a transformer per-entry and transforms the whole list state. If the wrapped per entry transformer is StateSnapshotTransformer.CollectionStateSnapshotTransformer, it respects its StateSnapshotTransformer.CollectionStateSnapshotTransformer.TransformStrategy.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.flink.runtime.state.StateSnapshotTransformer

StateSnapshotTransformer.CollectionStateSnapshotTransformer<T>, StateSnapshotTransformer.StateSnapshotTransformFactory<T>

Constructor Summary

Constructors

Constructor	Description
ListStateSnapshotTransformer(StateSnapshotTransformer<T> entryValueTransformer)

Method Summary

Modifier and Type	Method	Description
List<T>	filterOrTransform(List<T> list)	Transform or filter out state values which are included or skipped in the snapshot.

Methods inherited from class java.lang.Object

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

Constructor Detail

ListStateSnapshotTransformer

public ListStateSnapshotTransformer(StateSnapshotTransformer<T> entryValueTransformer)

Method Detail

filterOrTransform

@Nullable
public List<T> filterOrTransform(@Nullable
                                 List<T> list)

Description copied from interface: StateSnapshotTransformer

Transform or filter out state values which are included or skipped in the snapshot.

Specified by:

filterOrTransform in interface StateSnapshotTransformer<T>

Parameters:

list - non-serialized form of value

Returns:

value to snapshot or null which means the entry is not included