LeaderRetrievalUtils.LeaderInformationListener (Flink : Runtime 2.1.0 API)

java.lang.Object
- org.apache.flink.runtime.util.LeaderRetrievalUtils.LeaderInformationListener

All Implemented Interfaces:

LeaderRetrievalListener

Enclosing class:

LeaderRetrievalUtils
```
public static class LeaderRetrievalUtils.LeaderInformationListener
extends Object
implements LeaderRetrievalListener
```
Helper class which is used by the retrieveLeaderInformation method to retrieve the leader's rpc URL and the current leader session ID.

Constructor Summary

Constructors
Constructor Description

LeaderInformationListener()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`CompletableFuture<LeaderInformation>`	`getLeaderInformationFuture()`
`void`	`handleError(Exception exception)`	This method is called by the `LeaderRetrievalService` in case of an exception.
`void`	`notifyLeaderAddress(String leaderAddress, UUID leaderSessionID)`	This method is called by the `LeaderRetrievalService` when a new leader is elected.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - LeaderInformationListener
```
public LeaderInformationListener()
```
- Method Detail
  - getLeaderInformationFuture
```
public CompletableFuture<LeaderInformation> getLeaderInformationFuture()
```
  - notifyLeaderAddress
```
public void notifyLeaderAddress(String leaderAddress,
                                UUID leaderSessionID)
```
    Description copied from interface: LeaderRetrievalListener
    
    This method is called by the LeaderRetrievalService when a new leader is elected.
    If both arguments are null then it signals that leadership was revoked without a new leader having been elected.
    
    Specified by:
    
    notifyLeaderAddress in interface LeaderRetrievalListener
    
    Parameters:
    
    leaderAddress - The address of the new leader
    
    leaderSessionID - The new leader session ID
  - handleError
```
public void handleError(Exception exception)
```
    Description copied from interface: LeaderRetrievalListener
    
    This method is called by the LeaderRetrievalService in case of an exception. This assures that the LeaderRetrievalListener is aware of any problems occurring in the LeaderRetrievalService thread.
    
    Specified by:
    
    handleError in interface LeaderRetrievalListener