Module 6: Messaging & Decoupling (SQS)

In a large system, different parts shouldn't talk to each other directly. If one part breaks, the whole system shouldn't fail. This is called Decoupling.

What is SQS?

The Simple Queue Service (SQS) is like a mailbox. One service drops a message off, and another service picks it up when it's ready.

Mission: The Order System

You are building an e-commerce site. When a user buys something, you need to send an order message to the warehouse.

Step 1: Create the Mailbox

Run: aws sqs create-queue --queue-name orders-queue

Step 2: Send an Order

Run: aws sqs send-message --queue-url http://ls-test-aws:4566/000000000000/orders-queue --message-body "New Order #123"