| Interface | Description | 
|---|---|
| DistribStateManager | This interface represents a distributed state repository. | 
| DistributedQueue | Distributed queue component. | 
| DistributedQueueFactory | |
| NodeStateProvider | This interface models the access to node and replica information. | 
| SolrCloudManager | This interface abstracts the access to a SolrCloud cluster, including interactions with Zookeeper, Solr
 and generic HTTP calls. | 
| Class | Description | 
|---|---|
| ShardTerms | Hold values of terms, this class is immutable. | 
| SocketProxy | Kindly borrowed the idea and base implementation from the ActiveMQ project;
 useful for blocking traffic on a specified port. | 
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