Retail Banking Example

 
const user: User = { name: "Customer", description: "Retail banking customer" };
 
const system: ComputerSystem = { name: "Cloud Banking" };
const storage: Container = { name: "Data Store", system: system };
const backend: Container = { name: "Core Services", system: system };
 
const frontApp: ReactApp = {
  name: "Customer Dashboard",
  description: "Browser Single-page Application",
  belongsTo: system
};
const authApi: RestApi = {
  name: "Authentication",
  description: "Self-Hosted Authentication Service",
  belongsTo: backend
};
 
const accountsApi: RestApi = {
  name: "Accounts API",
  description: "Java Spring service for balances and payments",
  belongsTo: backend
};
 
const cache: Redis = {
  name: "Session Cache",
  description: "Stores customer session payloads",
  belongsTo: storage
};
 
const db: Postgres = {
  name: "Ledger DB",
  description: "Persistent customer and transaction data",
  belongsTo: storage
};
 
const auditStream: KafkaTopic = {
  name: "Audit Events",
  description: "Every request produces an audit record",
  belongsTo: backend
};
 
const fraudService: ExternalService = {
  name: "Fraud Guard",
  description: "3rd-party fraud scoring",
  belongsTo: backend
};
 
user.sendsRequestTo(frontApp, "launch app")
  .then(frontApp).sendsRequestTo(authApi, "login")
  .then(frontApp).sendsRequestTo(accountsApi, "load dashboard")
  .inParallel(
    () => accountsApi.getDataFrom(cache, "session context"),
    () => accountsApi.getDataFrom(db, "account snapshot")
  )
  .sendsRequestTo(authApi, "validate token")
  .then(accountsApi)
  .inParallel(
    () => accountsApi.sendsRequestTo(auditStream, "emit audit", { kind: 'event' }),
    () => accountsApi.sendsRequestTo(fraudService, "score transaction", { kind: 'async' })
  );