AZ05 · Azure cloud engineering
Functions Event-Driven Orders
A queue-triggered function processes orders, retries failures and moves poison messages aside.
🎯 You will learn to
- Use queue triggers
- Retry safely
- Make handlers idempotent
🧪 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
🗺️ Queue-triggered Function
The Function host polls the storage queue; failures retry and after five attempts the message goes to the poison queue.
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 must a retried handler not charge a customer twice?
🛡️ Safety & cost
Mock mode by default. Real Azure practice is opt-in: use your own subscription, a budget alert and the cleanup steps.
🧹 Cleanup
Delete the lab resource group (az group delete) and check Cost Management the next day.
📚 Reference documents
- Azure Functions overview · Microsoft Learn
- Azure Architecture Center · Microsoft Learn
- Azure resource providers and types · Microsoft Learn
- Azure Well-Architected Framework · Microsoft Learn
Official sources, checked on 5 Nov 2026. Cloud services change often; check the official page before relying on a feature. All references