@startuml
actor 用户 as user #A9A9A9
control 业务系统 as sys #A9A9A9
control 单点登录系统 as sso #A9A9A9
database redis as redis #A9A9A9



user -> sys: 登出
sys -> sys: 获取保存的Token
sys -> sso: 通知sso登出
sso -> redis: 删除登录信息
sso -> sys: 返回成功
sys -> user: 返回登录

@enduml