Why messaging
On This Lesson 4 topics
This lesson is planned. The outline below lists the topics it will cover. The full lesson has not been published yet.
In this lesson
state what a broker adds.
Planned topics
- A broker stores messages between a producer and a consumer.
- Benefits: temporal decoupling, load levelling (a queue absorbs spikes), easy fan-out, retry without the sender waiting.
- Costs: eventual consistency, duplicates, ordering questions, one more system to run.
- Shop use: after
OrderPlaced, inventory, payments, and notifications each react withoutordersknowing them. - Do not use messaging when the caller needs an immediate answer.
Draft outline details
Demonstration
orders publishes once; three consumers receive independently.
Check your understanding
Name two benefits of a broker.
Show answer
For example decoupling in time and absorbing load spikes.
Practice
Apply this lesson with the module's lab, exercises and quiz.
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