org.apache.flink.runtime.persistence

Interface ResourceVersion<R>

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

Modifier and Type	Method and 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.