| Package | Description | 
|---|---|
| org.apache.solr.client.solrj.impl | Concrete implementations of client API classes. | 
| org.apache.solr.common.cloud | Common Solr Cloud and ZooKeeper related classes reused on both clients & server. | 
| Modifier and Type | Method and Description | 
|---|---|
| void | BaseCloudSolrClient. registerCollectionStateWatcher(String collection,
                              CollectionStateWatcher watcher)Register a CollectionStateWatcher to be called when the cluster state for a collection changes
 or the set of live nodes changes. | 
| Modifier and Type | Method and Description | 
|---|---|
| void | ZkStateReader. registerCollectionStateWatcher(String collection,
                              CollectionStateWatcher stateWatcher)Register a CollectionStateWatcher to be called when the state of a collection changes
 or the set of live nodes changes. | 
| void | ZkStateReader. removeCollectionStateWatcher(String collection,
                            CollectionStateWatcher watcher)Remove a watcher from a collection's watch list. | 
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