ResourceVersion (Flink : Runtime 2.1.0 API)

Type Parameters:

R - Type of ResourceVersion

All Superinterfaces:

Comparable<R>, Serializable

All Known Implementing Classes:

IntegerResourceVersion, StringResourceVersion
```
public interface ResourceVersion<R>
extends Comparable<R>, Serializable
```
Resource version for specific state handle on the underlying storage. The implementation also needs to implement the Comparable interface so that we could compare the resource versions.

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  boolean isExisting()
  Check whether the state handle is existing.
  - Methods inherited from interface java.lang.Comparable
    compareTo

- Method Detail
  - isExisting
```
boolean isExisting()
```
    Check whether the state handle is existing.
    
    Returns:
    
    true if state handle exists with current ResourceVersion on external storage. Or false it does not exist.