LeaderContender (Flink : 2.0-SNAPSHOT API)

All Known Implementing Classes:

DefaultDispatcherRunner, DispatcherRestEndpoint, JobMasterServiceLeadershipRunner, MiniDispatcherRestEndpoint, ResourceManagerServiceImpl, WebMonitorEndpoint
```
public interface LeaderContender
```
Interface which has to be implemented to take part in the leader election process of the LeaderElectionService.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`grantLeadership(UUID leaderSessionID)`	Callback method which is called by the `LeaderElectionService` upon selecting this instance as the new leader.
`void`	`handleError(Exception exception)`	Callback method which is called by `LeaderElectionService` in case of an error in the service thread.
`void`	`revokeLeadership()`	Callback method which is called by the `LeaderElectionService` upon revoking the leadership of a former leader.

- Method Detail
  - grantLeadership
```
void grantLeadership(UUID leaderSessionID)
```
    Callback method which is called by the LeaderElectionService upon selecting this instance as the new leader. The method is called with the new leader session ID.
    
    Parameters:
    
    leaderSessionID - New leader session ID
  - revokeLeadership
```
void revokeLeadership()
```
    Callback method which is called by the LeaderElectionService upon revoking the leadership of a former leader. This might happen in case that multiple contenders have been granted leadership.
  - handleError
```
void handleError(Exception exception)
```
    Callback method which is called by LeaderElectionService in case of an error in the service thread.
    
    Parameters:
    
    exception - Caught exception