a.uml

@startuml
!includeurl https://raw.githubusercontent.com/RicardoNiepel/C4-PlantUML/master/C4_Container.puml

'LAYOUT_WITH_LEGEND()
LAYOUT_AS_SKETCH()

Person(volunteer, "volunteer")

System_Boundary(database,"Data set"){
    System(shimo, "Shimo", "Sheet collections")
    System(github, "wuhan2020/wuhan2020", "Yaml")
}

System_Boundary(data, "wuhan2020/data-sync"){
    System(dataFetcher, "Data fetcher", "")
    System_Boundary(dataParser, "Data parser"){
        System_Ext(pluginYML, "YAML Plugin")
        System_Ext(pluginXML, "XML Plugin")
        System_Ext(pluginCVS, "CVS Plugin")
        System_Ext(pluginOther, "...")
    }
}

System_Boundary(web, "wuhan2020/web-server"){
    System(webAPI, "Rest-API Server", "")
    System(webFront, "Web front-end", "")
}

Rel(volunteer, shimo, "Fill")
Rel(shimo, dataFetcher, "Fetch")
Rel(dataFetcher, pluginYML,"Parse")
Rel(dataFetcher, pluginXML,"Parse")
Rel(dataFetcher, pluginCVS,"Parse")
Rel(dataFetcher, pluginOther,"Parse")
Rel(pluginYML, github, "YAML update")
Rel(webAPI, github, "Get data")
Rel(webFront, webAPI, "Render")
@enduml