# Package org.apache.storm.trident.state.map

- Interface Summary
  Interface | Description
  --- | ---
  IBackingMap<T> |
  MapState<T> |
  ReadOnlyMapState<T> |
  RemovableMapState<T> |

- Class Summary
  Class | Description
  --- | ---
  CachedBatchReadsMap<T> |
  CachedBatchReadsMap.RetVal<T> |
  CachedMap<T> | Useful to layer over a map that communicates with a database.
  MapCombinerAggStateUpdater |
  MapReducerAggStateUpdater |
  MicroBatchIBackingMap<T> |
  MicroBatchIBackingMap.Options |
  NonTransactionalMap<T> |
  OpaqueMap<T> |
  SnapshottableMap<T> |
  TransactionalMap<T> |