Update component diagram to include models (#275)

* Update component diagram to include models

* Exported .PUML PlantUML diagrams to .SVG

Author: chubberlisk

docs/diagrams/component-overview.puml

@@ -9,18 +9,19 @@ title [Component Overview] HMPPS Integration API
 System_Ext(consumer, "Consumer Application", "An authenticated consumer of the Integration API.")
 
 Boundary(spring_boot_api, "HMPPS Integration REST API", "Spring Boot Kotlin API"){
-    Container(controller, "Controller", "Spring Boot API Controller", "Receives the request, uses Spring Boot functionality to route to the correct method, also validates incoming requests. Each method has a matching service. Also commonly known as a 'resource'.") 
+    Container(controller, "Controller", "Spring Boot API Controller", "Receives the request, uses Spring Boot functionality to route to the correct method, also validates incoming requests. Each method has a matching service. Also commonly known as a 'resource'.")
     Container(service, "Service", "Spring Boot Service Bean", "Responsible for deciding which gateways to call to get the necessary data, as well as consolidating responses from one or many gateways. Also commonly known as a 'use case'")
     Container(gateway, "Gateway", "Spring Boot Component Bean", "Makes a request on upstream systems to return data to the calling service. Converts response data into domain models for the service.")
+    Container(model, "Model", "Kotlin Data Class", "Represents the response data of an upstream API and our API. Each data class includes a mapping function which transforms the relevant upstream API model into our HMPPS model.")
 }
 
 System_Ext(upstream, "Upstream Systems", "Integrated systems where data is retrieved from.")
 
-
 Rel(consumer, controller, "Makes API calls to", "JSON/HTTPS")
 Rel_Down(controller, service, "Uses")
 Rel_Down(service, gateway, "Uses")
 Rel_Down(gateway, upstream, "Makes API calls to", "JSON/HTTPS")
+Rel_Right(gateway, model, "Uses")
 
 SHOW_DYNAMIC_LEGEND()