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Microservice Component Interactions

How the individual project components communicate at runtime.

Request–Response Flow (API)​

Background Worker Flow (Price Sync)​

SQS Message Flow​

Worker Isolation​

The InventoryAlert.Worker runs as a separate Docker container. It communicates with InventoryAlert.Api only via:

  1. Shared PostgreSQL — reads StockListing, writes PriceHistory, Notification, etc.
  2. Shared Redis — reads/writes cache, dedup keys, cooldown keys.
  3. SQS — consumes events published by the API, publishes events for handlers.
  4. SignalR Backplane (Redis) — pushes real-time notifications from Worker to API-connected clients.

There are no direct HTTP calls between the API and Worker containers.