The document describes the baseline V4 architecture for a business component, including the initialization sequence, command lifecycle, and potential issues. It shows the main host and BC host domains, with per-BC app domains housing business components. The command directly accesses the read model store instead of using a repository, and the repository is a singleton but its command property is reset on each call, risking inconsistencies with simultaneous access. The configuration repository is also not injected by the container.

1. V4 Baseline

2. Initialization
Secuence View Boundary View
In-Proccess
MAIN HOST BC’s HOST (Plugins)
Parent Per BC Per BC
AppDomain AppDomain AppDomain
Per BC
AppDomain

3. Business Component

4. Command Life Cycle
Get
CommandHandler Read Model
Put / Post
CreateSnapshot
Repository Snapshot Store
Store
Publish Event Store
EventBus
Handler / Denormalizer

5. Remarks
• The command is accessing the read model
directly coupling with the store
• The repository is been created as Singleton
but it’s Command property is set every time a
command is executed, meaning if 2
simultaneous calls happen we could get
inconsistency
• The configuration repository is not been set by
the container