adopt_ASG_doc #12
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# Walkthrough: NATSBridge
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**Version**: 1.0.0
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**Date**: 2026-03-13
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**Date**: 2026-03-23
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**Status**: Active
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**Ground Truth**: [`src/NATSBridge.jl`](../src/NATSBridge.jl)
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---
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## Executive Summary
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## 1. Executive Summary
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This document provides the **story of flow** for NATSBridge - the cross-platform bi-directional data bridge that enables seamless communication between **Julia**, **JavaScript**, **Python**, and **MicroPython** applications using NATS as the message bus.
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This document provides the **end-to-end trace** for NATSBridge - the cross-platform bi-directional data bridge that enables seamless communication between **Julia**, **JavaScript**, **Python**, and **MicroPython** applications using NATS as the message bus.
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This walkthrough serves as the primary onboarding guide for new developers and explains:
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- **User scenarios** - Real-world use cases from developer perspective
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- **Why steps are sequenced** - The rationale behind architectural decisions
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- **What could go wrong** - Common failure scenarios and recovery strategies
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### 1.1 Specification Traceability
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| Walkthrough Section | Specification Reference | Requirement ID(s) | Description |
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|---------------------|-------------------------|-------------------|-------------|
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| Section 2 (Big Picture) | specification.md:2, specification.md:15 | FR-001, FR-002, FR-003, FR-004, FR-005, FR-006, FR-007, FR-012, FR-013, FR-014 | End-to-end system flow diagrams |
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| Section 3 (Chat Scenario) | specification.md:2, specification.md:3, specification.md:5, specification.md:11 | FR-001, FR-006, FR-007, FR-012, FR-013, FR-014 | Chat webapp ↔ Julia backend with mixed payloads |
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| Section 4 (Large File) | specification.md:6, specification.md:7 | FR-003, FR-004, FR-008, FR-009, FR-010, NFR-104, NFR-105 | Large file transfer with link transport |
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| Section 5 (Tabular Data) | specification.md:5, specification.md:10 | FR-002, FR-012, NFR-101, NFR-102 | Arrow IPC tabular data exchange |
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| Section 6 (MicroPython) | specification.md:13, specification.md:17 | FR-005, FR-006, FR-012, NFR-106 | Memory-constrained device communication |
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| Section 7 (Cross-Platform) | specification.md:3, specification.md:4, specification.md:5, specification.md:11 | FR-001, FR-002, FR-003, FR-004, FR-005, FR-006, FR-007, FR-012, FR-013, FR-014 | Multi-platform chat application |
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| Section 8 (Error Handling) | specification.md:9 | FR-008, FR-009, FR-010, NFR-201, NFR-202, NFR-203 | Common error scenarios and recovery |
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| Section 9 (Debugging) | specification.md:4, specification.md:11 | FR-011, NFR-401, NFR-403 | Correlation ID tracking |
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| Section 10 (Performance) | specification.md:7, specification.md:13 | NFR-101, NFR-102, NFR-103, NFR-104, NFR-105, NFR-106, NFR-107 | Optimization strategies |
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| Section 11 (Deployment) | specification.md:12, specification.md:18 | FR-013, FR-014, NFR-201, NFR-203 | Infrastructure requirements |
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---
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## 2. Overview: The Big Picture
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## Overview: The Big Picture
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NATSBridge implements the **Claim-Check pattern** for efficient handling of large payloads (>0.5MB):
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@@ -718,13 +735,53 @@ log_trace(correlation_id, "Published to NATS")
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---
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## References
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## 12. References
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- [`docs/requirements.md`](./requirements.md) - Business requirements and user stories
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- [`docs/spec.md`](./spec.md) - Technical specification and contracts
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- [`docs/architecture.md`](./architecture.md) - System architecture diagrams
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- [`src/NATSBridge.jl`](../src/NATSBridge.jl) - Ground truth implementation
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- [`README.md`](../README.md) - Project overview
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### 12.1 Documentation Artifacts
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| Document | Purpose | Specification Traceability |
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|----------|---------|---------------------------|
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| [`docs/requirements.md`](./requirements.md) | Business requirements and user stories | FR-001 through FR-014, NFR-101 through NFR-405 |
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| [`docs/specification.md`](./specification.md) | Technical contract for NATSBridge | specification.md:2-19 (all sections) |
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| [`docs/ui-specification.md`](./ui-specification.md) | UI specification for client applications | UI components for data entry and display |
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| [`docs/walkthrough.md`](./walkthrough.md) | End-to-end system flow | This document |
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| [`docs/architecture.md`](./architecture.md) | System architecture diagrams | Component interaction and data flow |
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| [`docs/validation.md`](./validation.md) | CI/CD validation rules | Contract testing and spec compliance |
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| [`docs/runbook.md`](./runbook.md) | Operational runbook | Deployment, scaling, and troubleshooting |
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### 12.2 Implementation Files
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| File | Platform | Features | Specification Traceability |
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|------|----------|----------|---------------------------|
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| [`src/NATSBridge.jl`](../src/NATSBridge.jl) | Julia | Full feature set, Arrow IPC, multiple dispatch | specification.md:2-19 (all sections) |
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| [`src/natsbridge_ssr.js`](../src/natsbridge_ssr.js) | Node.js | Arrow IPC, async/await | specification.md:2-19 (all sections) |
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| [`src/natsbridge_csr.js`](../src/natsbridge_csr.js) | Browser | JSON table only, WebSocket NATS | specification.md:2-19 (all sections) |
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| [`src/natsbridge.py`](../src/natsbridge.py) | Python | Arrow IPC, async/await | specification.md:2-19 (all sections) |
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| [`src/natsbridge_mpy.py`](../src/natsbridge_mpy.py) | MicroPython | Limited to direct transport | specification.md:2-19 (all sections) |
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---
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## 13. Change Log
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| Date | Version | Changes | Specification Reference |
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|------|---------|---------|------------------------|
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| 2026-03-23 | 1.0.0 | Updated to ASG Framework walkthrough guidelines | All sections |
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| 2026-03-13 | 1.0.0 | Initial walkthrough documentation | specification.md:2-19 (all sections) |
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---
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## 14. Gap-Check Validation
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| Stage Transition | Gap-Check Question | Status |
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|------------------|-------------------|--------|
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| Requirements → Specification | Does the Specification define all edge cases and conflict scenarios from the Requirements? | ✅ Verified - All FR-XXX requirements have corresponding spec rules |
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| Specification → UI Specification | Does the UI Specification expose all the data and states defined in the Specification? | ⏳ Pending - UI spec not yet created |
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| UI Specification → Walkthrough | Does the Walkthrough reflect the complete flow including error states and timing? | ⏳ Pending - UI spec not yet created |
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| Walkthrough → Architecture | Does the Architecture support the performance and integration requirements defined in the Walkthrough? | ⏳ Pending - Architecture not yet created |
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---
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*This walkthrough document is versioned and maintained in git alongside the codebase. All implementations must adhere to this documentation.*
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---
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