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C4 PlantUML

lang = none

@startuml
!include C4_Context.puml

LAYOUT_WITH_LEGEND()

title System Context diagram for Internet Banking System

Person(customer, "Personal Banking Customer", "A customer of the bank, with personal bank accounts.")
System(banking_system, "Internet Banking System", "Allows customers to view information about their bank accounts, and make payments.")

System_Ext(mail_system, "E-mail system", "The internal Microsoft Exchange e-mail system.")
System_Ext(mainframe, "Mainframe Banking System", "Stores all of the core banking information about customers, accounts, transactions, etc.")

Rel(customer, banking_system, "Uses")
Rel_Back(customer, mail_system, "Sends e-mails to")
Rel_Neighbor(banking_system, mail_system, "Sends e-mails", "SMTP")
Rel(banking_system, mainframe, "Uses")
@enduml

lang = none

@startuml
!include C4_Container.puml

LAYOUT_TOP_DOWN
LAYOUT_WITH_LEGEND()

title Container diagram for Internet Banking System

Person(customer, Customer, "A customer of the bank, with personal bank accounts")

System_Boundary(c1, "Internet Banking") {
    Container(web_app, "Web Application", "Java, Spring MVC", "Delivers the static content and the Internet banking SPA")
    Container(spa, "Single-Page App", "JavaScript, Angular", "Provides all the Internet banking functionality to cutomers via their web browser")
    Container(mobile_app, "Mobile App", "C#, Xamarin", "Provides a limited subset of the Internet banking functionality to customers via their mobile device")
    ContainerDb(database, "Database", "SQL Database", "Stores user registraion information, hased auth credentials, access logs, etc.")
    Container(backend_api, "API Application", "Java, Docker Container", "Provides Internet banking functionality via API")
}

System_Ext(email_system, "E-Mail System", "The internal Microsoft Exchange system")
System_Ext(banking_system, "Mainframe Banking System", "Stores all of the core banking information about customers, accounts, transactions, etc.")

Rel(customer, web_app, "Uses", "HTTPS")
Rel(customer, spa, "Uses", "HTTPS")
Rel(customer, mobile_app, "Uses")

Rel_Neighbor(web_app, spa, "Delivers")
Rel(spa, backend_api, "Uses", "async, JSON/HTTPS")
Rel(mobile_app, backend_api, "Uses", "async, JSON/HTTPS")
Rel_Back_Neighbor(database, backend_api, "Reads from and writes to", "sync, JDBC")

Rel_Back(customer, email_system, "Sends e-mails to")
Rel_Back(email_system, backend_api, "Sends e-mails using", "sync, SMTP")
Rel_Neighbor(backend_api, banking_system, "Uses", "sync/async, XML/HTTPS")
@enduml

lang = none

@startuml
!include C4_Component.puml

LAYOUT_WITH_LEGEND()

title Component diagram for Internet Banking System - API Application

Container(spa, "Single Page Application", "javascript and angular", "Provides all the internet banking functionality to customers via their web browser.")
Container(ma, "Mobile App", "Xamarin", "Provides a limited subset ot the internet banking functionality to customers via their mobile mobile device.")
ContainerDb(db, "Database", "Relational Database Schema", "Stores user registration information, hashed authentication credentials, access logs, etc.")
System_Ext(mbs, "Mainframe Banking System", "Stores all of the core banking information about customers, accounts, transactions, etc.")

Container_Boundary(api, "API Application") {
    Component(sign, "Sign In Controller", "MVC Rest Controlle", "Allows users to sign in to the internet banking system")
    Component(accounts, "Accounts Summary Controller", "MVC Rest Controlle", "Provides customers with a summory of their bank accounts")
    Component(security, "Security Component", "Spring Bean", "Provides functionality related to singing in, changing passwords, etc.")
    Component(mbsfacade, "Mainframe Banking System Facade", "Spring Bean", "A facade onto the mainframe banking system.")

    Rel(sign, security, "Uses")
    Rel(accounts, mbsfacade, "Uses")
    Rel(security, db, "Read & write to", "JDBC")
    Rel(mbsfacade, mbs, "Uses", "XML/HTTPS")
}

Rel(spa, sign, "Uses", "JSON/HTTPS")
Rel(spa, accounts, "Uses", "JSON/HTTPS")

Rel(ma, sign, "Uses", "JSON/HTTPS")
Rel(ma, accounts, "Uses", "JSON/HTTPS")
@enduml