لماذا المراسلة

في هذا الدرس

state what a broker adds.

الموضوعات المخطط لها

• 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 without orders knowing them.
• Do not use messaging when the caller needs an immediate answer.