عرض عملي: توجيه الإشعارات باستخدام topic exchange

خطوة بخطوة

1. Start RabbitMQ with Docker; open the management UI.
2. Declare topic exchange notifications and queues email (notify.email.#) and sms (notify.sms.#).
3. Publish notify.email.order and notify.sms.shipped from Shop; watch each queue receive its message.
4. Add a DLX and a poison message that throws; with auto requeue enabled, show the endless loop.
5. Planned mistake: leave requeue on. Fix with nack without requeue, route to the DLQ, and show later messages still flow.
6. Add a TTL retry queue and show a message returning after the delay.