FileSplitAssigner (Flink : 2.0-SNAPSHOT API)

All Known Implementing Classes:

LocalityAwareSplitAssigner, SimpleSplitAssigner
```
@PublicEvolving
public interface FileSplitAssigner
```
The FileSplitAssigner is responsible for deciding what split should be processed next by which node. It determines split processing order and locality.

Nested Class Summary

Nested Classes
Modifier and Type	Interface	Description
`static interface`	`FileSplitAssigner.Provider`	Factory for the `FileSplitAssigner`, to allow the `FileSplitAssigner` to be eagerly initialized and to not be serializable.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`addSplits(Collection<FileSourceSplit> splits)`	Adds a set of splits to this assigner.
`Optional<FileSourceSplit>`	`getNext(String hostname)`	Gets the next split.
`Collection<FileSourceSplit>`	`remainingSplits()`	Gets the remaining splits that this assigner has pending.

- Method Detail
  - getNext
```
Optional<FileSourceSplit> getNext(@Nullable
                                  String hostname)
```
    Gets the next split.
    When this method returns an empty Optional, then the set of splits is assumed to be done and the source will finish once the readers finished their current splits.
  - addSplits
```
void addSplits(Collection<FileSourceSplit> splits)
```
    Adds a set of splits to this assigner. This happens for example when some split processing failed and the splits need to be re-added, or when new splits got discovered.
  - remainingSplits
```
Collection<FileSourceSplit> remainingSplits()
```
    Gets the remaining splits that this assigner has pending.