{
  "title": "Trail Notes | Code",
  "caption": "Note repository · How insertOrGet prevents duplicate writes",
  "c4Level": "C4Code",
  "nodes": [
    {
      "id": "save",
      "label": "saveNote()",
      "type": "Function",
      "technology": "Caller from Note service"
    },
    {
      "id": "contract",
      "label": "NoteRepository.insertOrGet()",
      "type": "Interface",
      "technology": "Repository contract"
    },
    {
      "id": "adapter",
      "label": "InMemoryNoteRepository",
      "type": "Class",
      "technology": "Single-process adapter"
    },
    {
      "id": "saved",
      "label": "SavedNote",
      "type": "Type",
      "technology": "Contains the original ID"
    },
    {
      "id": "conflict",
      "label": "RequestKeyConflict",
      "type": "Class",
      "technology": "Error"
    },
    {
      "id": "index",
      "label": "Notes Map",
      "type": "CodeElement",
      "technology": "Keyed by author and request key"
    }
  ],
  "relationships": [
    {
      "from": "save",
      "to": "contract",
      "label": "Passes author, key, and draft",
      "description": "note-service.ts:11 · note-repository.ts:6"
    },
    {
      "from": "adapter",
      "to": "contract",
      "label": "Implements the repository contract",
      "description": "note-repository.ts:15 · note-repository.ts:22"
    },
    {
      "from": "adapter",
      "to": "index",
      "label": "Looks up and inserts synchronously",
      "description": "note-repository.ts:24 · note-repository.ts:25 · note-repository.ts:39"
    },
    {
      "from": "adapter",
      "to": "saved",
      "label": "Returns the stored ID on a matching retry",
      "description": "note-repository.ts:24 · note-repository.ts:30 · demo.ts:29"
    },
    {
      "from": "adapter",
      "to": "conflict",
      "label": "Rejects a changed draft under the same key",
      "description": "note-repository.ts:27 · note-repository.ts:28 · demo.ts:35"
    }
  ]
}