# Sub-Second State Engine

*/Agents/Sub-Second_State_Engine*

## Neighborhood

### Composed into

- [Amberfusion](/Startups/Amberfusion) — composes · Startups

### What it does

- [Checkpoint State For Failover](/Tasks/Checkpoint_State_For_Failover) — performs · Tasks
- [Materialize State From Event Log](/Tasks/Materialize_State_From_Event_Log) — performs · Tasks
- [Serve State Reads With Freshness Guarantee](/Tasks/Serve_State_Reads_With_Freshness_Guarantee) — performs · Tasks

### Realizes

- [Real Time State Synchronization](/Services/Real_Time_State_Synchronization) — realizes · Services
- [Session State Management](/Services/Session_State_Management) — realizes · Services

### Uses tool

- [Invalidate Stale State Entry](/Action/Invalidate_Stale_State_Entry) — uses tool · Action
- [Changelog Compaction Store](/Products/Changelog_Compaction_Store) — uses tool · Products
- [In Memory Key Value Store](/Products/In_Memory_Key_Value_Store) — uses tool · Products