BookWorm follows Domain-Driven Design principles with clear domain boundaries and ubiquitous language throughout the system.
Domain Term | Definition | Context |
---|
Book | A published work available for purchase | Catalog Domain |
Order | A customer's request to purchase items | Ordering Domain |
Basket | Temporary collection of items for purchase | Shopping Domain |
Conversation | A chat session between participants | Communication Domain |
Security Aspect | Implementation | Standards |
---|
Authentication | OAuth 2.0 / OIDC with Keycloak | RFC 6749, RFC 6750 |
Authorization | Role-based access control (RBAC) | Custom policy framework |
Data Encryption | TLS 1.3 in transit, AES-256 at rest | FIPS 140-2 compliance |
API Security | JWT tokens, rate limiting, input validation | OWASP guidelines |
Secrets Management | Azure Key Vault integration | Zero-trust principles |
Cache Type | TTL | Use Case | Invalidation Strategy |
---|
Browser Cache | 1 hour | Static assets, images | Version-based |
CDN Cache | 24 hours | Public content | Manual purge |
API Response Cache | 5-15 minutes | Catalog data, search results | Time-based + tag-based |
Application Cache | 30 minutes | User sessions, temporary data | Event-driven |
Database Query Cache | Variable | Expensive queries | Data change triggers |
Optimization | Implementation | Benefit |
---|
Async Operations | Task-based programming | Non-blocking I/O operations |
Connection Pooling | EF Core connection pooling | Reduced connection overhead |
Pagination | Cursor-based pagination | Efficient large dataset handling |
Compression | Gzip/Brotli response compression | Reduced bandwidth usage |
Lazy Loading | On-demand data loading | Faster initial response times |
- Centralized Exception Handling: Implement a global exception handler to catch unhandled exceptions and return standardized error responses.
- Validation: Use data annotations and FluentValidation for request validation, returning 400 Bad Request responses for invalid input.
- Logging: Log errors with sufficient context (e.g., user ID, request ID) to facilitate troubleshooting.
- User-Friendly Messages: Avoid exposing internal error details to users; provide generic error messages instead.
Pattern | Implementation | Use Case |
---|
Circuit Breaker | Polly library | External service failures |
Retry Policies | Exponential backoff | Transient failures |
Timeout Policies | Configurable timeouts | Long-running operations |
Bulkhead Isolation | Separate thread pools | Fault isolation |
Fallback Mechanisms | Graceful degradation | Service unavailability |
builder.Logging.AddOpenTelemetry(logging =>
{
logging.IncludeFormattedMessage = true;
logging.IncludeScopes = true;
});
Metric Category | Key Metrics | Alerting Thresholds |
---|
Performance | Response time, throughput, error rate | > 2s response, > 5% error rate |
Infrastructure | CPU, memory, disk usage | > 80% utilization |
Business | Orders/hour, revenue, conversion rate | -20% from baseline |
Security | Failed logins, suspicious activity | > 10 failed attempts/minute |
Pattern | Use Case | Implementation |
---|
ACID Transactions | Single service operations | Entity Framework transactions |
Saga Pattern | Multi-service workflows | Orchestrated/Choreographed sagas |
Eventual Consistency | Cross-domain updates | Event-driven synchronization |
Optimistic Concurrency | Conflict resolution | Version-based conflict detection |
Aspect | Standard | Example |
---|
HTTP Methods | REST semantics | GET, POST, PUT, DELETE |
Status Codes | HTTP standards | 200, 201, 400, 404, 500 |
Resource Naming | Plural nouns | /books , /orders , /users |
Error Format | RFC 7807 | Problem Details for HTTP APIs |
Date/Time | ISO 8601 | 2024-12-31T23:59:59Z |