ZkIndexSchemaReader (Solr 9.2.1 core API)

java.lang.Object
- org.apache.solr.schema.ZkIndexSchemaReader

All Implemented Interfaces:

org.apache.solr.common.cloud.OnReconnect
```
public class ZkIndexSchemaReader
extends Object
implements org.apache.solr.common.cloud.OnReconnect
```
Keeps a ManagedIndexSchema up-to-date when changes are made to the serialized managed schema in ZooKeeper

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static class ZkIndexSchemaReader.SchemaWatcher
Watches for schema changes and triggers updates in the ZkIndexSchemaReader.

Constructor Summary

Constructors
Constructor Description

ZkIndexSchemaReader(ManagedIndexSchemaFactory managedIndexSchemaFactory, SolrCore solrCore)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`command()`	Called after a ZooKeeper session expiration occurs; need to re-create the watcher and update the current schema from ZooKeeper.
`ZkIndexSchemaReader.SchemaWatcher`	`createSchemaWatcher()`	Creates a schema watcher and returns it for controlling purposes.
`boolean`	`equals(Object other)`
`Object`	`getSchemaUpdateLock()`
`String`	`getUniqueCoreId()`
`int`	`hashCode()`
`ManagedIndexSchema`	`refreshSchemaFromZk(int expectedZkVersion)`
`String`	`toString()`

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

Constructor Detail

ZkIndexSchemaReader

public ZkIndexSchemaReader(ManagedIndexSchemaFactory managedIndexSchemaFactory,
                           SolrCore solrCore)

Method Detail
- getSchemaUpdateLock
```
public Object getSchemaUpdateLock()
```
- createSchemaWatcher
```
public ZkIndexSchemaReader.SchemaWatcher createSchemaWatcher()
```
  Creates a schema watcher and returns it for controlling purposes.
  
  Returns:
  
  the registered ZkIndexSchemaReader.SchemaWatcher.
- refreshSchemaFromZk
```
public ManagedIndexSchema refreshSchemaFromZk(int expectedZkVersion)
                                       throws org.apache.zookeeper.KeeperException,
                                              InterruptedException
```
  Throws:
  
  org.apache.zookeeper.KeeperException
  
  InterruptedException
- command
```
public void command()
```
  Called after a ZooKeeper session expiration occurs; need to re-create the watcher and update the current schema from ZooKeeper.
  
  Specified by:
  
  command in interface org.apache.solr.common.cloud.OnReconnect
- getUniqueCoreId
```
public String getUniqueCoreId()
```
- toString
```
public String toString()
```
  Overrides:
  
  toString in class Object
- hashCode
```
public int hashCode()
```
  Overrides:
  
  hashCode in class Object
- equals
```
public boolean equals(Object other)
```
  Overrides:
  
  equals in class Object