# Local States

- [In-Memory Map](https://docs.rierino.com/devops/microservices/building-blocks/data-sources/local-states/in-memory-map.md): This state manager (com.rierino.state.manager.MapStateManager) provides a local in-memory map for storing and reading manageable number of aggregates with very low latency.
- [Caffeine Cache](https://docs.rierino.com/devops/microservices/building-blocks/data-sources/local-states/caffeine-cache.md): This state manager (com.rierino.state.manager.CaffeineCacheStateManager) uses Caffeine to provide a local in-memory cache with expiration duration and max size.
- [Samza Based](https://docs.rierino.com/devops/microservices/building-blocks/data-sources/local-states/samza-based.md): This state manager (com.rierino.state.manager.SamzaStateManager) uses Samzalocal store (LevelDB/RocksDB) for storing and reading data.
- [Lucene Based](https://docs.rierino.com/devops/microservices/building-blocks/data-sources/local-states/lucene-based.md): This state manager (com.rierino.state.manager.LuceneStateManager) provides a Lucene state for local search capabilities.
- [Single File](https://docs.rierino.com/devops/microservices/building-blocks/data-sources/local-states/single-file.md): This state manager (com.rierino.state.manager.SingleFileStateManager) provides read-only access to a local json file, mainly used for test purposes.
- [Multiple Files](https://docs.rierino.com/devops/microservices/building-blocks/data-sources/local-states/multiple-files.md): This state manager (com.rierino.state.manager.MultiFileStateManager) provides read-write access to a local folder with ided json files.
- [Selected IDs Map](https://docs.rierino.com/devops/microservices/building-blocks/data-sources/local-states/selected-ids-map.md): This state manager (com.rierino.state.manager.IDMapStateManager) provides a local in-memory map for storing and reading a specific list of aggregates with very low latency.
- [Indexed Map](https://docs.rierino.com/devops/microservices/building-blocks/data-sources/local-states/indexed-map.md): This state manager (com.rierino.state.manager.IndexedMapStateManager) provides a local in-memory map for storing and reading aggregates which is also indexed with a specific field for quick filtering.


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