@startuml
title refill sequence
'注释: https://plantuml.com/zh/sequence-diagram


actor Merchant
boundary LoadBlancer
collections AccNginx
collections AccServer
collections QueueServer
collections DispatchServer
boundary ChannelServer

Merchant --> LoadBlancer: post
LoadBlancer -> AccNginx: Dispatch
AccNginx --> AccServer: Dispatch
AccServer --> AccServer: Check
AccServer --> QueueServer: push

DispatchServer --> QueueServer: pop
DispatchServer --> DispatchServer: AddOrder
DispatchServer --> ChannelServer: push

ChannelServer --> LoadBlancer: callback

LoadBlancer --> AccNginx: Dispatch

AccNginx --> AccServer: notify

@enduml