Skip to content
Diago

Packages by layer

A class diagram. An order service in three packages, the domain inside the application, with a repository interface and its PostgreSQL implementation in infrastructure.

An order service in three packages, the domain inside the application, with a repository interface and its PostgreSQL implementation in infrastructureAn order service in three packages, the domain inside the application, with a repository interface and its PostgreSQL implementation in infrastructure

Spec

layered-packages.json
{
  "type": "class",
  "classes": [
    {
      "id": "controller",
      "label": "OrderController",
      "methods": [{"visibility": "+", "text": "create(req): Response"}]
    },
    {
      "id": "service",
      "label": "OrderService",
      "methods": [{"visibility": "+", "text": "placeOrder(cmd): Order"}]
    },
    {
      "id": "order",
      "label": "Order",
      "attributes": [{"visibility": "-", "text": "id: string"}],
      "methods": [{"visibility": "+", "text": "total(): Money"}]
    },
    {
      "id": "item",
      "label": "LineItem",
      "attributes": [{"visibility": "-", "text": "quantity: int"}]
    },
    {
      "id": "repo",
      "label": "OrderRepository",
      "stereotype": "interface",
      "color": "orange",
      "methods": [{"visibility": "+", "text": "save(order: Order): void"}]
    },
    {
      "id": "pgRepo",
      "label": "PgOrderRepository",
      "methods": [{"visibility": "+", "text": "save(order: Order): void"}]
    }
  ],
  "relations": [
    {
      "id": "r-controller-service",
      "from": "controller",
      "to": "service",
      "kind": "association",
      "directed": true
    },
    {"id": "r-service-order", "from": "service", "to": "order", "kind": "dependency"},
    {
      "id": "r-order-item",
      "from": "order",
      "to": "item",
      "kind": "composition",
      "from_card": "1",
      "to_card": "1..*"
    },
    {
      "id": "r-service-repo",
      "from": "service",
      "to": "repo",
      "kind": "association",
      "directed": true
    },
    {"id": "r-pgRepo-repo", "from": "pgRepo", "to": "repo", "kind": "realization"}
  ],
  "packages": [
    {
      "id": "app",
      "label": "Application",
      "color": "blue",
      "contains": ["controller", "service", "domain"]
    },
    {"id": "domain", "label": "Domain", "color": "purple", "contains": ["order", "item", "repo"]},
    {"id": "infra", "label": "Infrastructure", "color": "gray", "contains": ["pgRepo"]}
  ]
}

Draw it yourself

Terminal window
diago render layered-packages.json > layered-packages.svg

Open it in the playground to edit it in your browser.