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Greg Young on Architectural Innovation: Eventing, Event Sourcing

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Skills Matter
Skills Matter

The document describes the flow of data and requests between a client and server. The client sends a request DTO to the server, which returns a DTO. The client then displays the DTO and allows the user to interact with it. Data is stored and domain objects are used, with application services and a remote facade facilitating communication between the client and data storage. Events are also involved, with handlers managing them.

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Data Storage Domain Object Domain Object Application Services Remote Facade Request DTO DTO returned Send up DTO Status returned Client
Request DTO DTO returned DTO Sent Ack/Nak Response Send DTO Back to Server Show DTO on Screen User Interacts With DTO
Data Storage Domain Object Domain Object Application Services Remote Facade Request DTO DTO returned Send up DTO Status returned Client
Request DTO DTO returned Message Sent Ack/Nak Response Send Messages Show DTO on Screen User Interacts With Screen, Build Messages
Data Storage Thin Read Layer (Direct to DTO) Remote Facade Request DTO DTO returned Client
Data Storage Domain Object Domain Object Application Services Remote Facade Message Sent Ack/Nak Response Client
Data Storage Write (Command) Read (Query) Domain Object Domain Object Thin Read Layer (Direct to DTO) Remote Facade Application Services Remote Facade Request DTO DTO returned Message Sent Ack/Nak Response Client
Data Storage Domain Object Domain Object Application Services Remote Facade Request DTO DTO returned Send up DTO Status returned Client
Data Storage Domain Object Domain Object Domain Object Domain Object Application Services Application Services Remote Facade Remote Facade Request DTO DTO returned Message Sent Ack/Nak Response Client
Data Storage Domain Object Domain Object Thin Read Layer (Direct to DTO) Remote Facade Application Services Remote Facade Request DTO DTO returned Message Sent Ack/Nak Response Client
Data Storage Data Storage Eventually Domain Object Domain Object Thin Read Layer (Direct to DTO) Remote Facade Application Services Remote Facade Request DTO DTO returned Message Sent Ack/Nak Response Client
Data Storage Data Storage handlers Events nhibernate Domain Object Domain Object Thin Read Layer (Direct to DTO) Remote Facade Application Services Remote Facade
Data Storage Data Storage handlers Events nhibernate Domain Object Domain Object Thin Read Layer (Direct to DTO) Remote Facade Application Services Remote Facade
Data Storage Data Storage handlers handlers Events Events Domain Object Domain Object Thin Read Layer (Direct to DTO) Remote Facade Application Services Remote Facade
Line Items (n) Purchase Order Shipping Information
Purchase Order AddItemCommand AddItemCommand AddItemEvent ChangeAddressEvent
Event Storage Data Storage handlers Events Events Domain Object Domain Object Thin Read Layer (Direct to DTO) Remote Facade Application Services Remote Facade
Event Storage Data Storage Events handlers Events Domain Object Domain Object Thin Read Layer (Direct to DTO) Remote Facade Application Services Remote Facade

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Greg Young on Architectural Innovation: Eventing, Event Sourcing

  • 1.
  • 2. Data Storage Domain Object Domain Object Application Services Remote Facade Request DTO DTO returned Send up DTO Status returned Client
  • 3. Request DTO DTO returned DTO Sent Ack/Nak Response Send DTO Back to Server Show DTO on Screen User Interacts With DTO
  • 4. Data Storage Domain Object Domain Object Application Services Remote Facade Request DTO DTO returned Send up DTO Status returned Client
  • 5. Request DTO DTO returned Message Sent Ack/Nak Response Send Messages Show DTO on Screen User Interacts With Screen, Build Messages
  • 6. Data Storage Thin Read Layer (Direct to DTO) Remote Facade Request DTO DTO returned Client
  • 7. Data Storage Domain Object Domain Object Application Services Remote Facade Message Sent Ack/Nak Response Client
  • 8. Data Storage Write (Command) Read (Query) Domain Object Domain Object Thin Read Layer (Direct to DTO) Remote Facade Application Services Remote Facade Request DTO DTO returned Message Sent Ack/Nak Response Client
  • 9. Data Storage Domain Object Domain Object Application Services Remote Facade Request DTO DTO returned Send up DTO Status returned Client
  • 10. Data Storage Domain Object Domain Object Domain Object Domain Object Application Services Application Services Remote Facade Remote Facade Request DTO DTO returned Message Sent Ack/Nak Response Client
  • 11. Data Storage Domain Object Domain Object Thin Read Layer (Direct to DTO) Remote Facade Application Services Remote Facade Request DTO DTO returned Message Sent Ack/Nak Response Client
  • 12. Data Storage Data Storage Eventually Domain Object Domain Object Thin Read Layer (Direct to DTO) Remote Facade Application Services Remote Facade Request DTO DTO returned Message Sent Ack/Nak Response Client
  • 13. Data Storage Data Storage handlers Events nhibernate Domain Object Domain Object Thin Read Layer (Direct to DTO) Remote Facade Application Services Remote Facade
  • 14.
  • 15. Data Storage Data Storage handlers Events nhibernate Domain Object Domain Object Thin Read Layer (Direct to DTO) Remote Facade Application Services Remote Facade
  • 16. Data Storage Data Storage handlers handlers Events Events Domain Object Domain Object Thin Read Layer (Direct to DTO) Remote Facade Application Services Remote Facade
  • 17.
  • 18. Line Items (n) Purchase Order Shipping Information
  • 19.
  • 20. Purchase Order AddItemCommand AddItemCommand AddItemEvent ChangeAddressEvent
  • 21.
  • 22.
  • 23.
  • 24. Event Storage Data Storage handlers Events Events Domain Object Domain Object Thin Read Layer (Direct to DTO) Remote Facade Application Services Remote Facade
  • 25. Event Storage Data Storage Events handlers Events Domain Object Domain Object Thin Read Layer (Direct to DTO) Remote Facade Application Services Remote Facade