The aim of this document is to describe the architecture of the solution, first by defining the business concepts it deals with and then showing how this translates into the technical architecture.
2. Business Architecture
OperatorFabric is based on the concept of cards, which contain data regarding events that are relevant for the operator. A third party tool publishes cards and the cards are received on the screen of the operators. Depending on the type of the cards, the operator can send back information to the third party via a "response card".
2.1. Business components
To do the job, the following business components are defined :
Card Publication : this component receives the cards from third-party tools or users
Card Consultation : this component delivers the cards to the operators and provide access to all cards exchanged (archives)
Card rendering and process definition : this component stores the information for the card rendering (templates, internationalization, …) and a light description of the process associate (states, response card, …). This configuration data can be provided either by an administrator or by a third party tool.
User Management : this component is used to manage users, groups, entities and perimeters.
External devices : this optional component permit to send alarm to an external device instead of playing a sound on the user computer. For now, only one driver exists using modbus protocol.
2.2. Business objects
The business objects can be represented as follows :
Card : the core business object which contains the data to show to the user(or operator)
Publisher : the emitter of the card (be it a third-party tool or an entity)
User : the operator receiving cards and responding via response cards
Entity : an entity (containing a list of users) , it can be used to model organizations (examples : control center, company , department… ) . An entity can be part of another entity or even of several entities.
Group : a group (containing a list of users) , it can be used to model roles in organizations setting the group type to 'ROLE' (examples : supervisor, dispatcher … ) and it can be used to define the rigths on business processes by setting the group type to 'PERMISSION' (example: GROUP_ALLOWED_TO_SEND_CARD_PROCESS_X)
Process : the process the card is about
Process Group : a way to group processes on the user interface
State : the step in the process
Perimeter : for a defined group the visibility of a card for a specific process and state
Card Rendering : data for card rendering
A card can have a parent card, in this case the card can be named child card.
3. Technical Architecture
The architecture is based on independent modules. All business services are accessible via REST API.
3.1. Business components
We find here the business component seen before:
We have a "UI" component which stores the static pages and the UI code that is downloaded by the browser. The UI is based an Angular and Handlebars for the card templating.
The business component named "Card rendering and process definition" is at the technical level known as "Businessconfig service". This service receive card rendering and process definition as a bundle. The bundle is a tar.gz file containing
json process configuration file (containing states & actions)
templates for rendering
Except form the UI, which is based on angular, all business components are based on SpringBoot and packaged via Docker.
Spring WebFlux is used to provide the card in a fluid way.
3.2. Technical components
It provides a filtered view of the APIS and static served pages for external access through browsers or other http compliant accesses. It provides the rooting for accessing the services from outside. It is a nginx server package with docker, this component contains the angular UI component.
The broker is used to share information asynchronously across the whole services. It is implemented via RabbitMQ
The architecture provides a default authentication service via KeyCloak but it can delegate it to an external provider. Authentication is done through the use of Oauth2, three flows are supported : implicit, authorization code and password.
The cards are stored in a MongoDb database. The bundles are stored in a file system.
4. Software architecture
|The current software does not yet fully follow the architecture described here, it is a work in progress.|
4.1. Back Architecture
The main idea is to make the business code as technology independent as possible. This means that the business code should be independent of the Spring Framework for example. Inspired by the hexagonal architecture, this leads to the following simplified view:
Unit testing consists in testing the business code and using mock objects to simulate the servers (mongoDB, rabbit …)
4.2. Front Architecture
The main idea is to make the business code as technology independent as possible. This means that the business code should be independent of the Angular Framework for example. Inspired by the hexagonal architecture, this leads to the following simplified view:
The UI component shall contain as little as possible business code.
Unit testing consists in testing the business code and using mock objects to simulate the servers (in app/tests/mocks)