The Booking Service End to End

Ana's request for seat A12 returned 201 Created after 690 ms. It was the first request after the finished booking service started. In those 690 ms the service checked a signed token, validated the body, and asked a proxy for permission. It also called the payment provider once and ran seven SQL statements, six of them inside one transaction.

After the response had left, two other threads finished the job. One sent a message to Kafka, and one turned that message into Ana's confirmation email.

Each of these steps was built in an earlier lesson, in a small project of its own