{
  "id": "bbg-p0186-grpc-and-service-communication-service",
  "title": "CRUD State vs Event Sourcing",
  "chapter": "messaging-events-and-streaming",
  "batch": "26",
  "rank": 254,
  "sourcePage": 186,
  "sourcePointer": "p. 186",
  "status": "accepted",
  "reviewerStatus": "reviewed",
  "fidelityScore": 0.9,
  "canvas": {
    "width": 960,
    "height": 640
  },
  "fireworksTechGraph": {
    "style": "style-1-flat-icon",
    "diagramType": "comparison",
    "topologyNotes": [
      "source page render inspected",
      "extracted page text inspected",
      "source page render inspected",
      "preserve side-by-side comparison: CRUD updates current order row directly, event sourcing appends order events and rebuilds a read model",
      "retargeted from service-communication extraction to messaging-events-and-streaming chapter"
    ],
    "publicBoundary": [
      "original vector output",
      "no source pixels",
      "no source mark or long wording"
    ]
  },
  "callouts": [],
  "sourceReview": {
    "conceptAnchors": [
      "concept: command creates order",
      "concept: CRUD updates row",
      "concept: event store append",
      "concept: sequencer",
      "concept: read model rebuilt from event log"
    ],
    "labelSource": "curated",
    "semanticStatus": "reviewed"
  },
  "groups": [
    {
      "id": "crud",
      "label": "Current-state CRUD",
      "x": 62,
      "y": 120,
      "w": 374,
      "h": 382
    },
    {
      "id": "events",
      "label": "Event sourcing",
      "x": 524,
      "y": 120,
      "w": 374,
      "h": 382
    }
  ],
  "shapes": [
    {
      "id": "crudUser",
      "kind": "actor",
      "label": "User action",
      "detail": "create modify",
      "x": 112,
      "y": 164,
      "w": 82,
      "h": 86,
      "tone": "blue"
    },
    {
      "id": "crudSvc",
      "kind": "rect",
      "label": "Order service",
      "detail": "mutates state",
      "x": 232,
      "y": 184,
      "w": 126,
      "h": 62,
      "tone": "orange"
    },
    {
      "id": "crudTable",
      "kind": "table",
      "label": "Order table",
      "detail": "latest row",
      "x": 202,
      "y": 346,
      "w": 168,
      "h": 96,
      "tone": "green"
    },
    {
      "id": "eventUser",
      "kind": "actor",
      "label": "User action",
      "detail": "commands",
      "x": 572,
      "y": 164,
      "w": 82,
      "h": 86,
      "tone": "blue"
    },
    {
      "id": "eventSvc",
      "kind": "rect",
      "label": "Order service",
      "detail": "emits events",
      "x": 694,
      "y": 184,
      "w": 126,
      "h": 62,
      "tone": "orange"
    },
    {
      "id": "sequencer",
      "kind": "gateway",
      "label": "Sequencer",
      "detail": "order",
      "x": 586,
      "y": 318,
      "w": 112,
      "h": 74,
      "tone": "purple"
    },
    {
      "id": "eventLog",
      "kind": "queue",
      "label": "Event log",
      "detail": "append only",
      "x": 736,
      "y": 330,
      "w": 124,
      "h": 54,
      "tone": "teal"
    },
    {
      "id": "orderView",
      "kind": "table",
      "label": "Order view",
      "detail": "rebuilt state",
      "x": 650,
      "y": 430,
      "w": 152,
      "h": 72,
      "tone": "green"
    }
  ],
  "connectors": [
    {
      "from": "crudUser",
      "to": "crudSvc",
      "label": "command",
      "flow": "main"
    },
    {
      "from": "crudSvc",
      "to": "crudTable",
      "label": "insert update",
      "flow": "data"
    },
    {
      "from": "eventUser",
      "to": "eventSvc",
      "label": "command",
      "flow": "main"
    },
    {
      "from": "eventSvc",
      "to": "sequencer",
      "label": "event",
      "flow": "async"
    },
    {
      "from": "sequencer",
      "to": "eventLog",
      "label": "append",
      "flow": "data"
    },
    {
      "from": "eventLog",
      "to": "orderView",
      "label": "project",
      "flow": "data"
    },
    {
      "from": "orderView",
      "to": "eventLog",
      "label": "replay",
      "flow": "control",
      "dashed": true
    }
  ]
}