{"slug":"architecture/BRIDGE_LAYER","title":"Bridge Layer","section":"architecture","sectionLabel":"Architecture","status":"unclassified","type":"document","path":"architecture/BRIDGE_LAYER.mdx","bytes":4984,"description":"Connectivity and integration — the bidirectional bridge between SpineWorkspace and all external systems","updated":null,"source":"integratewise/Integratewise-docs-wiki","content":"\n\n**Connectivity & Integration.**\n\nThe Bridge Layer connects SpineWorkspace to every external system. It is bidirectional — the same systems that provide data can also be acted upon.\n\n## Design Principles\n\n1. **Bidirectional** — Every connector reads and writes\n2. **Normalized** — All data is normalized to Spine entities\n3. **Resilient** — Retries, circuit breakers, graceful degradation\n4. **Governed** — All external interactions go through governance\n5. **Observable** — Every interaction is logged and auditable\n\n---\n\n## Source & Target Systems\n\n| Category | Systems |\n|----------|---------|\n| **CRM** | Salesforce, HubSpot, Dynamics 365 |\n| **ERP** | NetSuite, QuickBooks |\n| **Support** | ServiceNow, Zendesk |\n| **Communication** | Slack, Teams, Google Workspace, Microsoft 365 |\n| **Databases** | Any SQL/NoSQL database via API |\n| **Custom** | Files, Events, Webhooks, Any System |\n\n---\n\n## Bridge Components\n\n| Component | Purpose |\n|-----------|---------|\n| **Connectors** | Pre-built system integrations with authentication |\n| **Adapters** | Protocol and format translation |\n| **APIs** | Direct REST/GraphQL API connections |\n| **Webhooks** | Event-driven inbound data ingestion |\n| **Event Streaming** | Real-time data feeds (Kafka, SSE, etc.) |\n| **File / DB Sync** | Batch and incremental synchronization |\n| **Transformers** | Data normalization and enrichment |\n| **Protocol Handlers** | Protocol-specific implementations (SOAP, gRPC, etc.) |\n\n---\n\n## Data Flow\n\n### Inbound (Source → Spine)\n\n```\nSource System → Connector → Adapter → Transformer → Normalization → Spine Event → Spine Store\n```\n\n1. **Source System** — Data changes or events occur in the external system\n2. **Connector** — Authenticates and retrieves the data\n3. **Adapter** — Translates protocol and format\n4. **Transformer** — Maps to Spine entity schema\n5. **Normalization** — Resolves entity references, deduplicates\n6. **Spine Event** — Creates a Spine event with evidence\n7. **Spine Store** — Persists to the appropriate Spine store\n\n### Outbound (Spine → Target)\n\n```\nSpine Decision → Governance Check → Execution Token → Adapter → Connector → Target System\n```\n\n1. **Spine Decision** — A decision or action is approved\n2. **Governance Check** — Governance layer validates the action\n3. **Execution Token** — Token issued for the specific action\n4. **Adapter** — Translates to target system format\n5. **Connector** — Authenticates and sends the request\n6. **Target System** — Action is executed in the external system\n\n---\n\n## Connector Contract\n\nEvery connector implements:\n\n```typescript\ninterface Connector {\n  id: string;\n  system: string;\n  auth: AuthConfig;\n  capabilities: Capability[];\n  \n  // Read operations\n  fetch(entity: string, params: QueryParams): Promise<Entity[]>;\n  watch(entity: string, callback: EventCallback): Subscription;\n  \n  // Write operations\n  create(entity: string, data: EntityData): Promise<Entity>;\n  update(entity: string, id: string, data: EntityData): Promise<Entity>;\n  delete(entity: string, id: string): Promise<void>;\n  \n  // Health\n  health(): Promise<HealthStatus>;\n}\n```\n\n---\n\n## Sync Rules\n\n| Rule | Description |\n|------|-------------|\n| **Real-time** | Webhooks and event streaming for live data |\n| **Polling** | Configurable polling intervals for systems without webhooks |\n| **Batch** | Scheduled batch sync for large datasets |\n| **On-demand** | Pull data when requested by a user or agent |\n| **Conflict resolution** | Last-write-wins with Spine as source of truth |\n\n---\n\n## Fallback Rules\n\n| Failure | Fallback |\n|---------|----------|\n| Connector timeout | Retry with exponential backoff (3 attempts) |\n| Auth failure | Re-authenticate, notify admin |\n| Rate limit | Queue and retry after cooldown |\n| System down | Circuit breaker opens, serve cached data |\n| Data conflict | Spine wins, log discrepancy for reconciliation |\n\n---\n\n## Protocol Support\n\n| Protocol | Support |\n|----------|---------|\n| REST | Full CRUD, pagination, rate limiting |\n| GraphQL | Query and mutation support |\n| SOAP | Legacy system support via adapter |\n| gRPC | High-performance service-to-service |\n| WebSocket | Real-time bidirectional streaming |\n| MQTT | IoT and device integration |\n| Custom | Protocol handler extensibility |\n\n---\n\n## Governance\n\nAll Bridge Layer interactions are governed:\n\n| Rule | Description |\n|------|-------------|\n| **Authentication** | OAuth, API key, or certificate-based |\n| **Authorization** | Role-based, per-system permissions |\n| **Rate limiting** | Per-system and per-tenant limits |\n| **Audit logging** | Every API call is logged |\n| **Data classification** | Sensitivity labels propagate across systems |\n| **Purpose limitation** | Integrations only access data for stated purposes |\n"}