Add sequence diagram for inventory

It is deliberately simplified to still be somewhat readable, especially
regarding the names of participants.

src/main/asciidoc/models/design/seq_inventory.puml

@@ -0,0 +1,97 @@
+@startuml
+participant Administrator
+participant InventoryController
+participant Inventory
+participant Catalog
+participant "item1:UniqueInventoryItem" as item1
+participant "prod1:Product" as prod1
+participant Spring
+
+== List Inventory ==
+
+Administrator -> InventoryController : list()
+activate Administrator
+activate InventoryController
+InventoryController -> Inventory : findAll()
+activate Inventory
+InventoryController <-- Inventory : Streamable<UniqueInventoryItem>
+deactivate Inventory
+InventoryController -> Spring : add result to model as “inventory”
+activate Spring
+InventoryController <-- Spring : Model
+deactivate Spring
+Administrator <-- InventoryController : Template “inventory”
+deactivate Administrator
+deactivate InventoryController
+
+== Edit Inventory Item ==
+
+Administrator -> InventoryController : edit()
+activate Administrator
+activate InventoryController
+InventoryController -> Inventory : findByProduct()
+activate Inventory
+InventoryController <-- Inventory : UniqueInventoryItem
+deactivate Inventory
+InventoryController -> InventoryController : update Product with new data
+InventoryController -> Catalog : save Product
+activate Catalog
+InventoryController <-- Catalog
+deactivate Catalog
+InventoryController -> Inventory : update Quantity of UniqueInventoryItem
+activate Inventory
+InventoryController <-- Inventory
+deactivate Inventory
+Administrator <-- InventoryController : Redirect to “/inventory”
+deactivate Administrator
+deactivate InventoryController
+
+== Add Inventory Item ==
+
+Administrator -> InventoryController : add()
+activate Administrator
+activate InventoryController
+create prod1
+InventoryController -> prod1 : new
+activate prod1
+InventoryController -> Catalog : save()
+activate Catalog
+InventoryController <-- Catalog : Product
+deactivate Catalog
+create item1
+InventoryController -> item1 : new
+activate item1
+InventoryController -> Inventory : save()
+activate Inventory
+InventoryController <-- Inventory : UniqueInventoryItem
+deactivate Inventory
+Administrator <-- InventoryController : Redirect to “/inventory”
+'deactivate prod1
+'deactivate item1
+deactivate Administrator
+deactivate InventoryController
+
+== Delete Inventory Item ==
+Administrator -> InventoryController : delete()
+activate Administrator
+activate InventoryController
+InventoryController -> Inventory : findByProduct()
+activate Inventory
+InventoryController <-- Inventory : UniqueInventoryItem
+deactivate Inventory
+InventoryController -> Inventory : delete()
+activate Inventory
+Inventory -> item1
+destroy item1
+InventoryController <-- Inventory
+deactivate Inventory
+InventoryController -> Catalog : delete()
+activate Catalog
+Catalog -> prod1
+destroy prod1
+InventoryController <-- Catalog
+deactivate Catalog
+Administrator <-- InventoryController : Redirect to “/inventory”
+deactivate InventoryController
+deactivate Administrator
+@enduml