State & Memory Overview

Causet models two related concepts: entity state (what rules read and write during an intent) and application memory (accumulated history on an entity over time). Both are derived from events — neither is manually patched in application code.

The derivation chain

Entity snapshots update synchronously on the write path. Projection tables update asynchronously.

Declaring state

# app.causet
includes:
  states: [./states/**/*.state.causet]

state:
  user:
    entity_key: user_id
    fields:
      - name: concert_count
        type: int
        default: 0
      - name: following_count
        type: int
        default: 0

In this section

Next steps

• Intents — rules that mutate entity state
• Replay — source of truth for replay
• Entity State — field reference