📜 Diagram for Lesson 6: Workflow & Activity Separation
Visualizing Clean Architecture Patterns
Clean architecture pattern with separated workflow orchestration and activity implementations in the user onboarding process
User Onboarding Workflow Architecture
flowchart TD
A[Start UserOnboardingWorkflow] --> B[Call UserValidationActivity]
B --> C{User validation successful?}
C -- Yes --> D[Call AccountCreationActivity]
C -- No --> E[Return validation failure]
D --> F{Account creation successful?}
F -- Yes --> G[Call NotificationActivity - Welcome Email]
F -- No --> H[Return account creation failure]
G --> I{Email sent successfully?}
I -- Yes --> J[Return success result]
I -- No --> K[Log email failure but continue]
K --> J
style A fill:#e1f5fe
style J fill:#e8f5e8
style E fill:#ffebee
style H fill:#ffebee
Clean Architecture Layers
flowchart TD
subgraph "Clean Architecture"
subgraph "Workflow Layer - Orchestration"
A[Start UserOnboardingWorkflow]
C{User validation successful?}
F{Account creation successful?}
I{Email sent successfully?}
J[Return success result]
end
subgraph "Activity Layer - Business Logic"
subgraph "UserValidationActivity"
L[validateEmail]
M[validatePhoneNumber]
N[checkDuplicateUser]
end
subgraph "AccountCreationActivity"
O[createUserRecord]
P[generateUserId]
Q[setInitialPreferences]
end
subgraph "NotificationActivity"
R[sendWelcomeEmail]
S[sendSMSConfirmation]
end
end
end
A --> L
A --> O
A --> R
💡 Key Architecture Insights
Clean Separation of Concerns:
- ✅ Workflows handle orchestration logic - decision points and flow control
- ✅ Activities contain actual business logic - focused, testable implementations
- ✅ Each activity has focused responsibility - single purpose, easy to maintain
- ✅ Activities can be tested independently - unit testing friendly
- ✅ Clear boundaries between coordination and execution
Error Handling Strategy
Critical vs Non-Critical Failures:
- 🔴 Critical: Validation and Account Creation → Stop Process
- 🟡 Non-Critical: Email Notification → Log and Continue
Benefits:
- Graceful degradation for non-essential features
- Clear failure boundaries with specific recovery actions
- User experience isn't blocked by secondary failures
- System resilience through intelligent error handling
🚀 Production Benefits
This architecture pattern provides:
- ✅ Maintainability - Clear separation makes changes easier
- ✅ Testability - Each component can be tested in isolation
- ✅ Scalability - Activities can scale independently
- ✅ Reliability - Failure isolation prevents cascading issues
- ✅ Observability - Clear flow visibility for debugging
Perfect foundation for enterprise workflows! 🎉