org.apache.solr.common.cloud

Class ZkStateReader.AliasesManager

java.lang.Object

org.apache.solr.common.cloud.ZkStateReader.AliasesManager

All Implemented Interfaces:

org.apache.zookeeper.Watcher

Enclosing class:

ZkStateReader

public class ZkStateReader.AliasesManager
extends Object
implements org.apache.zookeeper.Watcher

A class to manage the aliases instance, including watching for changes. There should only ever be one instance of this class per instance of ZkStateReader. Normally it will not be useful to create a new instance since this watcher automatically re-registers itself every time it is updated.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.zookeeper.Watcher

org.apache.zookeeper.Watcher.Event, org.apache.zookeeper.Watcher.WatcherType

Constructor Summary

Constructors

Constructor and Description
AliasesManager()

Method Summary

Modifier and Type	Method and Description
void	applyModificationAndExportToZk(UnaryOperator<Aliases> op) Writes an updated Aliases to zk.
Aliases	getAliases()
void	process(org.apache.zookeeper.WatchedEvent event)
boolean	update() Ensures the internal aliases is up to date.

Methods inherited from class java.lang.Object

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

Constructor Detail

AliasesManager

public AliasesManager()

Method Detail

getAliases

public Aliases getAliases()

applyModificationAndExportToZk

public void applyModificationAndExportToZk(UnaryOperator<Aliases> op)

Writes an updated Aliases to zk. It will retry if there are races with other modifications, giving up after 30 seconds with a SolrException. The caller should understand it's possible the aliases has further changed if it examines it.

update

public boolean update()
               throws org.apache.zookeeper.KeeperException,
                      InterruptedException

Ensures the internal aliases is up to date. If there is a change, return true.

Returns:

true if an update was performed

Throws:

org.apache.zookeeper.KeeperException

InterruptedException

process

public void process(org.apache.zookeeper.WatchedEvent event)

Specified by:

process in interface org.apache.zookeeper.Watcher