ZkStateReader.AliasesManager (Solr 9.1.1 solrj-zookeeper API)

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 Description

AliasesManager()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`applyModificationAndExportToZk(UnaryOperator<org.apache.solr.common.cloud.Aliases> op)`	Writes an updated `Aliases` to zk.
`org.apache.solr.common.cloud.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 org.apache.solr.common.cloud.Aliases getAliases()
```
  - applyModificationAndExportToZk
```
public void applyModificationAndExportToZk(UnaryOperator<org.apache.solr.common.cloud.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