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VLT BackOffice Technical Solution Draft (Technologies, tools, engines…

- - - - Model and everything depending on used database technology and tools
    - - Model and everything not depending on underlying database technology and tool
    - - Mapping business to repository and vice versa. Copying objects with content, converting types and formats.
    - - Logging work of users (administrators using admin app)
    - - Defines what can user do using admin app and what can attendant do directly on terminal using service menu
    - - User of administration web application
      - Attendant wiorking directly on terminal through service menu
    - - Enties and its relationships
    - - Somebody using games or other applications on terminal
    - - Hardware device managed by BackOffice system. Also known as EGM.
    - - Game software running on terminal
    - - Event occured on terminal during its operation
    - - List of terminals and its relationships to geographics location, venues and retailers.
    - - Single geographically located place where one or more terminals are held
    - - There is no such thing like definition of the "entity" word :smiley:
    - - Automatic (on the fly) change of value of entity property from bad to good
    - - Limitations of player's activities (maximum bet, some time limits etc.). Editable by user him/herself.
  - - - Repository entity model
        
        Constraints from business model
        
        Matches underlying database engine (SQL or Mongo now)
      - Repository logic
    - - Business entity model
        
        Defines basic validation constraints and exposes to be used in repository entity model
        
        Ranges for numbers
        
        Maximum string length
        
        Regular expression for strings (allowed characters and formats)
        
        Logical consistency validations
      - Business logic
        
        Operations above business model
    - - Basic validation (validators)
      - Permission checking
      - Sanitizing values
        
        Deduplication of names
        
        Automatic string trimming and shrinking
    - - ODATA protocol for data pull
      - SignalR for data push
        
        How to formal definition? :question:
    - - Deployed as a single large service with WebAPI
      - Inprocess communication using C# interfaces
      - Ready to be deployed separately
  - - - Stores incoming business events from terminals
      - Allows to query for store business events
    - - Receives business events from terminal
      - Receives special alive messages from terminals
      - Allow to determine time of terminal last activity
    - - Stores information related to topology of terminals
      - Allows queries and changes
    - - Stores information about users and theirs permissions
      - Allows queries and changes
    - - Stores information about users activities in whole system. Receives messages from other microservices.
    - - Provides communication with terminals
      - Commands, events, notifications
    - - Stores large binaries as software packages, videos, advertisements etc.
    - - Distributes large binaries to terminals
    - - Monitors events incoming from terminals and starts predefined operations when some conditions are met
    - - Generates reports using data exposed by other services
    - - Sends mails and SMS to users
      - Using 3-rd party tool for templating and sending
      - Must be usable for non-technical staff (templates)
      - Must be able to send mails with attachments, rich text formatting and images.
      - Must handle delivery failures
      - Must keep statistics for reporting
    - - Monitors realtime status of terminal
      - Aggregates information from other services
    - - Manages software packages on terminals
      - Remote installation, deinstallation
      - Maintains information about terminals software configuration
    - - Stores configuration data for terminals components
      - Stores configuration data for system components
      - Is agnostic to the data types, stores data as classes with type tag serialized to BSON
    - - Exports financial data to company accounting system
- - - - Entity Framework
      - Allow to use virtually ANY database engine. SQL Express must be enough.
  - - - Sendind :question:
      - Templating :question:
    - - Templating :question:
      - Sending :question:
- - - - Entities
      - Events
      - Commands
      - Formats