Detailed component design

flowchart TD

client[client] --> api_gateway{API Gateway}

api_gateway --> |/login, /create-user|user_service[User Service]

api_gateway --> |/get-feed, /view-user, /get-favorite|feed_service[Feed Service]

api_gateway --> |/tweet, /favorite, /share|tweet_service[Tweet Service]

api_gateway --> |/follow, /unfollow|follow_service[Follow Service]

user_service --> |/create-user, /login|user_db_master[(User DB Master)]

user_db_master --> user_db_read_replica[(User DB Read)]

tweet_service --> |/tweet, /share|tweet_write_mq{{Tweet MQ}}

tweet_write_mq --> tweet_db_master[(Tweet DB Master)]

tweet_db_master --> tweet_db_read_replica[(Tweet DB Read)]

tweet_service -->|/favorite|favorite_write_mq{{Favorite MQ}}

favorite_write_mq --> favorite_service[Favorite Service]

favorite_service <--> user_db_read_replica

favorite_service <--> tweet_db_read_replica

favorite_service --> favorite_db_master[(Favorite DB Master)]

favorite_db_master --> favorite_db_read_replica[(Favorite DB Read)]

follow_service --> follow_write_mq{{Follow MQ}}

follow_write_mq --> follow_db_master[(Follow DB Master)]

follow_db_master --> follow_db_read_replica[(Follow DB Read)]

feed_service <--> feed_cache

tweet_db_read_replica --> tweet_feed_mq{{Tweet Feed MQ}}

tweet_feed_mq --> feed_cache

follow_db_read_replica --> follow_feed_mq{{Follow Feed MQ}}

follow_feed_mq --> feed_cache

favorite_db_read_replica --> favorite_feed_mq{{Favorite Feed MQ}}

favorite_feed_mq --> feed_cache

feed_cache <--> tweet_db_read_replica

feed_cache <--> follow_db_read_replica

feed_cache <--> favorite_db_read_replica