{
  "schemaVersion": 1,
  "chart": "architecture",
  "theme": "clean",
  "render": {
    "width": 1040,
    "padding": 24,
    "scale": 2
  },
  "data": {
    "id": "order-event-architecture",
    "locale": "zh-CN",
    "eyebrow": "合成技术案例 · 架构分组图",
    "title": "订单事件架构：同步受理，异步协作",
    "subtitle": "层间箭头仅表示分组层级；具体依赖、事件方向与数据归属以节点文字为准。",
    "layers": [
      {
        "tag": "入口",
        "accent": 1,
        "nodes": [
          {
            "name": "商城前端",
            "desc": "同步调用订单服务，创建订单。",
            "icon": "code"
          },
          {
            "name": "支付平台",
            "desc": "携带回调 ID，同步调用回调服务。",
            "icon": "shield"
          }
        ]
      },
      {
        "tag": "服务",
        "accent": 1,
        "nodes": [
          {
            "name": "订单状态维护与可靠事件发布",
            "desc": "订单服务：写订单库，异步发布 OrderCreated；消费 PaymentConfirmed，在同一事务更新支付状态与已消费事件 ID。",
            "icon": "package"
          },
          {
            "name": "支付回调幂等处理与事件发布",
            "desc": "回调服务：写回调库，事务提交后确认接收；按回调 ID 去重，异步发布 PaymentConfirmed。",
            "icon": "shield"
          },
          {
            "name": "库存预留与重复事件去重",
            "desc": "库存消费者：异步消费 OrderCreated，在同一事务写入库存预留结果与已消费事件 ID。",
            "icon": "layers"
          }
        ]
      },
      {
        "tag": "资源",
        "accent": 1,
        "nodes": [
          {
            "name": "订单库",
            "desc": "PostgreSQL；仅订单服务读写。订单与 outbox 同一事务提交；保存消费去重记录。",
            "icon": "lock"
          },
          {
            "name": "回调库",
            "desc": "独立 PostgreSQL；仅回调服务读写。回调 ID 与 outbox 同一事务提交。",
            "icon": "lock"
          },
          {
            "name": "库存库",
            "desc": "独立 PostgreSQL；仅库存消费者读写。保存预留结果和消费去重记录。",
            "icon": "lock"
          },
          {
            "name": "业务事件队列",
            "desc": "至少一次投递。OrderCreated → 库存消费者；PaymentConfirmed → 订单服务。",
            "icon": "layers"
          }
        ]
      }
    ],
    "connectors": [
      {
        "label": "分组层级 · 非节点连线"
      },
      {
        "label": "分组层级 · 非节点连线"
      }
    ],
    "footerLabel": "可靠性边界",
    "footer": "订单与回调服务各自从 outbox 重试失败发布。回调按回调 ID 去重；订单与库存消费按事件 ID 去重。至少一次投递不等于恰好一次处理；图中没有逐节点连线或串行调用链。"
  }
}