1. Strategic DDD¶

Strategic modeling defines how the problem is divided and how independent parts relate to each other.

Domains and Subdomains¶

Domains organize business logic. It is fundamental to distinguish what is Core business and what is support.

Domain Retail {
  domainVisionStatement = "A seamless and modern shopping experience"

  Subdomain Core type CORE_DOMAIN {
    domainVisionStatement = "Order management and checkout"
  }

  Subdomain Catalog type GENERIC_SUBDOMAIN {
    domainVisionStatement = "Product catalog (purchased or generic)"
  }

  Subdomain Notifications type SUPPORTING_DOMAIN {}
}

Types: CORE_DOMAIN, SUPPORTING_DOMAIN, GENERIC_SUBDOMAIN.
domainVisionStatement: Describes the purpose of the domain or subdomain.

Bounded Contexts¶

Bounded Contexts are the boundaries where a specific model applies. They are usually linked to a Subdomain.

BoundedContext Checkout implements Core {
  type = SYSTEM
  responsibilities = "Process purchase orders"
  implementationTechnology = "Python / FastAPI"
  knowledgeLevel = CONCRETE

  // Advanced option: Modularize within the context
  Module Pricing {
    basePackage = "com.retail.pricing"
    // Aggregates and specific services can go here
  }
}

implements: Links the context to a Subdomain (what it "realizes").
Key attributes: type (SYSTEM, FEATURE, TEAM, etc.), responsibilities, implementationTechnology.

Context Maps and Relationships¶

Defines how Bounded Contexts interact.

ContextMap RetailLandscape {
  type = SYSTEM_LANDSCAPE
  state = TO_BE

  contains Checkout, Catalog, Shipping

  // Relationship with specific pattern (Anti-Corruption Layer)
  Checkout [ACL]-> Shipping {
    implementationTechnology = "REST/JSON"
    downstreamRights = VETO_RIGHT
  }

  // Simple relationship (Shared Kernel)
  Checkout [SK]<-> Catalog
}

Supported Relationship Types:

[U]->[D]: Generic Upstream-Downstream.
[P]<->[P]: Partnership.
[SK]<->[SK]: Shared Kernel.
[C]<-[S]: Customer-Supplier.
[ACL]<-: Anti-Corruption Layer (on the downstream side).
[OHS]->: Open Host Service (on the upstream side).
[PL]->: Published Language.
[CF]<-: Conformist.