org.apache.flink.runtime.state

接口 StateSnapshotTransformer<T>

类型参数:

T - type of state

所有已知子接口:

StateSnapshotTransformer.CollectionStateSnapshotTransformer<T>

所有已知实现类:

StateSnapshotTransformers.ListStateSnapshotTransformer, StateSnapshotTransformers.MapStateSnapshotTransformer

函数接口:

这是一个函数接口, 因此可用作 lambda 表达式或方法引用的赋值目标。

@FunctionalInterface
 @NotThreadSafe
public interface StateSnapshotTransformer<T>

Transformer of state values which are included or skipped in the snapshot.

This transformer can be applied to state values to decide which entries should be included into the snapshot. The included entries can be optionally modified before.

Unless specified differently, the transformer should be applied per entry for collection types of state, like list or map.

嵌套类概要

嵌套类

限定符和类型	接口和说明
static interface	StateSnapshotTransformer.CollectionStateSnapshotTransformer<T> Collection state specific transformer which says how to transform entries of the collection.
static interface	StateSnapshotTransformer.StateSnapshotTransformFactory<T> This factory creates state transformers depending on the form of values to transform.

方法概要

限定符和类型	方法和说明
T	filterOrTransform(T value) Transform or filter out state values which are included or skipped in the snapshot.

方法详细资料

filterOrTransform

@Nullable
T filterOrTransform(@Nullable
                              T value)

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

参数:

value - non-serialized form of value

返回:

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