C4_Dynamic Diagram Sample - message bus.puml

@startuml
!include https://raw.githubusercontent.com/plantuml-stdlib/C4-PlantUML/master/C4_Dynamic.puml

LAYOUT_TOP_DOWN()
LAYOUT_WITH_LEGEND()

Person(customer, Customer, "A customer")
System_Boundary(c1, "Customer Information") {
    Container(app, "Customer Application", "Javascript, Angular", "Allows customers to manage their profile")
    Container(customer_service, "Customer Service", "Java, Spring Boot", "The point of access for customer information")
    Container(message_bus, "Message Bus", "RabbitMQ", "Transport for business events")
    Container(reporting_service, "Reporting Service", "Ruby", "Creates normalised data for reporting purposes")
    Container(audit_service, "Audit Service", "C#/.NET", "Provides organisation-wide auditing facilities")
    ContainerDb(customer_db, "Customer Database", "Oracle 12c", "Stores customer information")
    ContainerDb(reporting_db, "Reporting Database", "MySQL", "Stores a normalized version of all business data for ad hoc reporting purposes")
    Container(audit_store, "Audit Store", "Event Store", "Stores information about events that have happened")
}

Rel_D(customer, app, "Updates his profile using", "HTTPS")
Rel(app, customer_service, "Updates customer information using", "JSON/HTTPS")
Rel_R(customer_service, customer_db, "Stores data in", "JDBC")

Rel_D(customer_service, message_bus, "Sends customer update events to", "async", $index=Index()-1)
Rel_U(customer_service, app, "Confirm update to", "async", $index=LastIndex()-2)

Rel_L(message_bus, reporting_service, "Sends customer update events to", "async", $index=Index()-1)
Rel(reporting_service, reporting_db, "Stores data in", $index=Index()-1)

' $index cab be first arg too (like the old RelIndex... calls), as long it is written with $index=.... 
Rel_R($index=SetIndex(5)-2, message_bus, audit_service, "Sends customer update events to", "async")
Rel($index=Index()-2, audit_service, audit_store, "Stores events in")

SHOW_LEGEND()
@enduml