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@startuml

skinparam titleFontSize 40
skinparam titleFontColor #black
title ChatRoom

skinparam backgroundColor #White
skinparam handwritten false

actor user
participant client
participant server
database redis
database database
actor doctor

==User Login Service==
user -> client: operation
client -> server: POST request with user name and password
server -> database: check username and password
database -> server: pass check
server -> client: respense with new token 

==User And Doctor ChatRoom Service==
user -> client: operation
client -> server: send GET request to host:/chat/{doctor}, upgrade Http to Websocket
client -> server: send message to server use JSON format
server -> redis: store the message to cache
redis -> database: cron task store data from cache to SQL database
server -> doctor: message content
server -> client: message send response


@enduml

PlantUML version 1.2022.0(Wed Jan 12 00:16:42 CST 2022)
(GPL source distribution)
Java Runtime: Java(TM) SE Runtime Environment
JVM: Java HotSpot(TM) 64-Bit Server VM
Default Encoding: UTF-8
Language: zh
Country: CN
--></g></svg>