EricJoy2048 commented on issue #4021:
URL:
https://github.com/apache/incubator-seatunnel/issues/4021#issuecomment-1410320333
> example
>
> Add interface
>
> ```java
> public interface SupportExctlyOnce {
>
> }
> ```
>
> Source or Sink implement interface
>
> ```java
> public class MySource implements SeaTunnelSource, SupportExctlyOnce {
> }
> ```
I suggest we add key feature enum
```
public enum SourceKeyFeature {
Exactly-once,
xxxx,
xxxx
}
public enum SinkKeyFeature {
xxx,
xxx
}
```
And add method `List<SourceKeyFeature> getSupportedKeyFeatures()` to
`Factory`.
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