Semantic Layers and Hierarchical Organization in Context as Code
Understanding how context is organized hierarchically and semantically is crucial for effective CaC implementation. Let's dive into how these layers work together to create a complete context picture.
Understanding how context is organized hierarchically and semantically is crucial for effective CaC implementation. Let's dive into how these layers work together to create a complete context picture.
## Semantic Layer Architecture
@SystemContext({
version: "1.0",
layers: {
business: BusinessLayer,
technical: TechnicalLayer,
operational: OperationalLayer,
security: SecurityLayer,
compliance: ComplianceLayer
}
})
// Business Layer
interface BusinessLayer {
domain: {
name: "Payments",
ubiquitousLanguage: {
concepts: {
"Payment": "Financial transaction between customer and merchant",
"Authorization": "Approval from payment network",
"Settlement": "Final transfer of funds"
}
},
stakeholders: ["Finance", "Risk", "Operations"]
},
objectives: {
primary: "Process payments securely and reliably",
metrics: {
success_rate: ">99.9%",
average_latency: "<2s"
}
}
}
// Technical Layer
interface TechnicalLayer {
architecture: {
pattern: "Event-driven microservice",
style: "CQRS with Event Sourcing",
scalability: {
type: "Horizontal",
limits: {
min_instances: 3,
max_instances: 20
}
}
}
}
## Hierarchical Organization
// System Level Context
@SystemContext({
name: "E-Commerce Platform",
domains: ["Payments", "Inventory", "Shipping"],
global_policies: {
security: "Zero Trust",
data_retention: "GDPR Compliant"
}
})
// Domain Level Context
@DomainContext({
name: "Payments",
bounded_contexts: ["Processing", "Reconciliation", "Reporting"],
domain_policies: {
transaction_isolation: "Serializable",
audit_requirements: "PCI-DSS"
}
})
// Service Level Context
@ServiceContext({
name: "PaymentProcessor",
domain: "Payments",
bounded_context: "Processing",
service_contracts: {
apis: ["CreatePayment", "AuthorizePayment"],
events: ["PaymentCreated", "PaymentAuthorized"]
}
})
// Component Level Context
@ComponentContext({
name: "PaymentValidator",
service: "PaymentProcessor",
responsibility: "Validate payment details and prevent fraud"
})
## Cross-Cutting Concerns
@CrossCuttingContext({
type: "Security",
applies_to: ["PaymentProcessor", "UserService"],
requirements: {
authentication: "OAuth2 with MFA",
encryption: "Data in transit and at rest",
audit: "All access events logged"
}
})
## Semantic Relationships
@RelationshipContext({
type: "Service Dependencies",
relationships: [
{
from: "PaymentProcessor",
to: "UserService",
nature: "Synchronous/REST",
criticality: "High",
fallback: "Circuit Breaker Pattern"
}
]
})
## Context Inheritance
@InheritanceContext({
base: "BasePaymentService",
inherits: {
security_policies: "merge",
slas: "override",
compliance: "additive"
},
restrictions: {
override_protected: ["audit_requirements"],
must_implement: ["fraud_detection"]
}
})
## Layer Interaction Model
@LayerInteraction({
flow: {
business_to_technical: {
requirements: "translate_to_architecture",
constraints: "enforce_in_implementation"
},
technical_to_operational: {
metrics: "monitor_and_alert",
capacity: "auto_scale"
}
},
validation: {
cross_layer: {
business_rules: "must_have_technical_implementation",
security_requirements: "must_have_operational_controls"
}
}
})
## Context Navigation
@NavigationModel({
traversal: {
vertical: {
drill_down: ["system", "domain", "service", "component"],
roll_up: ["component", "service", "domain", "system"]
},
horizontal: {
related_services: "dependency_graph",
peer_components: "same_layer"
}
},
views: {
architecture: "technical_focus",
business: "domain_focus",
operations: "deployment_focus"
}
})
## Semantic Query Capabilities
@QueryCapabilities({
patterns: {
impact_analysis: `
MATCH (service) -[:DEPENDS_ON*]-> (dependent)
WHERE service.name = "PaymentProcessor"
RETURN dependent
`,
security_trace: `
TRACE security_requirements
FROM component TO system
WHERE component.handles_pii = true
`
}
})
## Layer-Specific Validation
@LayerValidation({
business: {
required_fields: ["objective", "stakeholders", "success_metrics"],
rules: [
"every_metric_must_have_threshold",
"all_stakeholders_must_exist"
]
},
technical: {
required_fields: ["architecture_pattern", "scalability_model"],
rules: [
"must_specify_resource_requirements",
"must_define_failure_modes"
]
},
operational: {
required_fields: ["slo", "monitoring_strategy"],
rules: [
"must_have_alert_thresholds",
"must_specify_backup_strategy"
]
}
})
## Context Composition
@ContextComposition({
aggregation: {
method: "hierarchical_rollup",
rules: {
sla: "most_stringent",
security: "union_of_requirements",
dependencies: "transitive_closure"
}
},
decomposition: {
strategy: "bounded_contexts",
constraints: {
max_depth: 5,
max_dependencies: 8
}
}
})
## Key Principles
1. **Layer Independence**
- Each layer can evolve independently
- Clear interfaces between layers
- Explicit dependency management
2. **Hierarchical Clarity**
- Clear parent-child relationships
- Inheritance of context
- Override mechanisms
3. **Cross-Layer Consistency**
- Automated validation
- Relationship tracking
- Impact analysis
4. **Semantic Richness**
- Rich metadata
- Clear relationships
- Queryable structure
This organization provides a robust foundation for managing complex system context while maintaining clarity and accessibility. The semantic layers ensure that context is meaningful and machine-processable, while the hierarchical organization provides clear structure and inheritance patterns.By Eduarda Ferreira