org.apache.flink.runtime.webmonitor.retriever

类 LeaderRetriever

java.lang.Object

org.apache.flink.runtime.webmonitor.retriever.LeaderRetriever

所有已实现的接口:

LeaderRetrievalListener

直接已知子类:

LeaderGatewayRetriever

public class LeaderRetriever
extends Object
implements LeaderRetrievalListener

Retrieves and stores the current leader address.

字段概要

字段

限定符和类型	字段和说明
protected org.slf4j.Logger	log

构造器概要

构造器

构造器和说明
LeaderRetriever()

方法概要

限定符和类型	方法和说明
CompletableFuture<org.apache.flink.api.java.tuple.Tuple2<String,UUID>>	getLeaderFuture() Returns the current JobManagerGateway future.
Optional<org.apache.flink.api.java.tuple.Tuple2<String,UUID>>	getLeaderNow() Returns the current leader information if available.
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.
protected void	notifyNewLeaderAddress(CompletableFuture<org.apache.flink.api.java.tuple.Tuple2<String,UUID>> newLeaderAddressFuture)

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

字段详细资料

log

protected final org.slf4j.Logger log

构造器详细资料

LeaderRetriever

public LeaderRetriever()

方法详细资料

getLeaderNow

public Optional<org.apache.flink.api.java.tuple.Tuple2<String,UUID>> getLeaderNow()
                                                                           throws Exception

Returns the current leader information if available. Otherwise it returns an empty optional.

返回:

The current leader information if available. Otherwise it returns an empty optional.

抛出:

Exception - if the leader future has been completed with an exception

getLeaderFuture

public CompletableFuture<org.apache.flink.api.java.tuple.Tuple2<String,UUID>> getLeaderFuture()

Returns the current JobManagerGateway future.

notifyLeaderAddress

public void notifyLeaderAddress(String leaderAddress,
                                UUID leaderSessionID)

从接口复制的说明: 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If both arguments are null then it signals that leadership was revoked without a new leader having been elected.

指定者:

notifyLeaderAddress 在接口中 LeaderRetrievalListener

参数:

leaderAddress - The address of the new leader

leaderSessionID - The new leader session ID

handleError

public void handleError(Exception exception)

从接口复制的说明: 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.

指定者:

handleError 在接口中 LeaderRetrievalListener

notifyNewLeaderAddress

protected void notifyNewLeaderAddress(CompletableFuture<org.apache.flink.api.java.tuple.Tuple2<String,UUID>> newLeaderAddressFuture)