SupportsHandleExecutionAttemptSourceEvent (Flink : Core 1.20.2-cp1 API)

```
@PublicEvolving
public interface SupportsHandleExecutionAttemptSourceEvent
```
An decorative interface of SplitEnumerator which allows to handle SourceEvent sent from a specific execution attempt.
The split enumerator must implement this interface if it needs to deal with custom source events and is used in cases that a subtask can have multiple concurrent execution attempts, e.g. if speculative execution is enabled. Otherwise an error will be thrown when the split enumerator receives a custom source event.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`handleSourceEvent(int subtaskId, int attemptNumber, SourceEvent sourceEvent)`	Handles a custom source event from the source reader.

- Method Detail
  - handleSourceEvent
```
void handleSourceEvent(int subtaskId,
                       int attemptNumber,
                       SourceEvent sourceEvent)
```
    Handles a custom source event from the source reader. It is similar to SplitEnumerator.handleSourceEvent(int, SourceEvent) but is aware of the subtask execution attempt who sent this event.
    
    Parameters:
    
    subtaskId - the subtask id of the source reader who sent the source event.
    
    attemptNumber - the attempt number of the source reader who sent the source event.
    
    sourceEvent - the source event from the source reader.