CSE43 · Cloud foundations
Serverless Order Flow
An order event triggers functions for payment check, stock and email. Watch the events flow and fail one step.
🎯 You will learn to
- Publish and consume events
- Keep functions small
- Handle a failed step
🧪 Live environment
Runs entirely in your browser: nothing is installed, no real cloud account is used and your code is never sent to our server.
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✅ Steps & checkpoints
🗺️ Event-driven order
An order event fans out to independent functions; each can fail and retry without blocking the others.
The 2D diagram shows the exact flow, ports and trust boundaries. The 3D scene is a concept view of the same parts; packets travel along the same arrows.
🤔 Think about it
Why should each function do only one job?
🛡️ Safety & cost
Mock cloud: no account, no resources, no cost.
🧹 Cleanup
Mock resources disappear when you leave the page.
📚 Reference documents
- What is AWS Lambda? · AWS
- Azure Functions overview · Microsoft Learn
- Azure Well-Architected Framework · Microsoft Learn
- AWS Well-Architected Framework · AWS
Official sources, checked on 5 Nov 2026. Cloud services change often; check the official page before relying on a feature. All references