Request flows

Tweet flow

The User initiates a tweet request through the API Gateway.
The API Gateway verifies the user’s authentication by communicating with the Authentication Service.
Once authentication is successful, the API Gateway forwards the request to the Post Service to create the tweet.
The Post Service then stores the tweet in the Database and, after successfully storing it, sends a notification message to the Message Queue.
The Notification Service consumes the notification message and sends out notifications to the user’s followers.
Lastly, the API Gateway sends a confirmation back to the User.

View timeline flow

User request to view timeline
The API Gateway verifies the user’s authentication by communicating with the Authentication Service.
Once authentication is successful, the API Gateway forwards the request to the Post Service to generate timeline.
The post service looks up in the DB for all the followed user's tweet, and look up in redis for the frequent viewed tweet
Post service send timeline back to user