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Lets focus on business value
The document discusses how to focus on business value when developing software. It advocates using domain-driven design and concrete patterns like CQRS and MVVM. Bifrost is introduced as an open-source framework that implements these approaches. Domain-driven design is said to help create a common language between developers and domain experts. CQRS separates reads from writes for better performance and scalability. Bifrost promotes good practices for line-of-business applications but is flexible enough that only relevant components need be used.
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Lets focus on business value
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- 3. Lets focus onbusiness value Power point template by Colin Eberhardt
- 4. Agenda How to focuson business value Domain Driven Design Concrete patterns; CQRS, MVVM Bifrost – an open-source framework to cover it all
- 5. Who am I Einar Ingebrigtsen @einari einar@dolittle.com http_//www.dolittle.com http://blog.dolittle.com http://www.ingebrigtsen.info
- 6. Statistics Software projects 2009: - 32%successful - 24% failed - 44% challenged 2004: - Cancelled projects cost $55 Billion Annually http://www.projectsmart.co.uk/docs/chaos-report.pdf
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- 8. What are wegetting paid to do? Use the most fancy technology out there C# 5.0, Roslyn, F#, TPL, ASP.net MVC 3, SignalR, RavenDB Join the alpha geek crew and use all the latest buzz words and create an architecture around that showcase our technical skills?
- 9. What is businessvalue? The short answer Helping the business achieve its objectives Faster Simpler Cheaper Better More
- 10. Why is thishard to do? Developers don’t understand what the business needs The Business doesn’t understand what the business needs If the business does understand what it needs…
- 11. Why is thishard to do? Even if we do understand what they want, we can’t build it because of ... Race Eager conditions Transactions Logging Serialization Performance loading Lazy Caching Mapping Auditing Concurrency Staleness loading
- 12. Why is thishard to do? If somehow we’ve managed to get our infrastructure in place and give the business what it needs, it’s TOO LATE! Legal New Market Changes Priorities Changes New New Acquisitions Requirements Competitor
- 13. Be agile! Not justin terms of process (Scrum, Kanban, XP) We need to be able to change decisions priorities CODE!!
- 14. Understand who youruser is
- 15. Feedback loop Talk tousers regularly Test TDD / BDD Executable Specifications Testers
- 16. Bounded Contexts Different representationsin different contexts
- 17. Bounded Contexts -Shopping
- 18. Bounded Contexts –Shift Management Employee Plays a central role – identified by Social Security Number Substitute It refers to the Employee by concept, but we do not need its address – only its availability and possibly its name for display purposes
- 19. Domain Driven Design Focuson the core domain Creative collaboration between domain experts and software practitioners Create a common language and common understanding of the domain
- 20. Domain Driven Design Buildingblocks Aggregate Roots Value Objects Services Repositories Entities … and more…
- 21. CQRS Client Command Queries Domain Event Handlers Publish Persist Update Domain Persistence Read Model
- 22. Command Expresses what shouldhappen Should express intent AddItem- / AddAccessory- ToCart - maps to AddProduct() on the AggregatedRoot
- 23. EventSource The source ofevents The place that events originate from
- 24. Aggregate Root Holds onlyinternal state, if needed - no public state Exposes behavior as methods
- 25. Event Represents the truthin the system; “... this is what happened...” Simple DTO with primitive properties only!
- 26. MVVM Model Get from server View Observes Observable ViewModel
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- 28. Bifrost Full end toend framework for line-of- business application development Promotes good practices such as CQRS, MVVM through high focus on DDD You don’t need the entire thing, but will get benefits for every component you add
- 29. Bifrost Client focus JavaScript ASP.net MVC Web in general Silverlight WinRT (Experimental) … changes coming
- 30. Bifrost Backend CQRS Cloudscale Realtime applications Clients persistently connected to the server
- 31. Bifrost - Architecture Client Result that affect Queries and Invoke Behavior Meta Data Read Models Server Queries Domain Read Models Meta Data
- 32. CQRS – BifrostStyle Client Command Command Coordinator Command Handler(s) Aggregate Root Read Model Event Subscriber(s) Events EventStore
- 35. Summary Domain Driven Design Willhelp you establish a language and understand what you’re creating CQRS Lets you establish a set of good patterns and practices, mind opener Bifrost One incarnation – but not look at it as a CQRS implementation, it is so much more http://blog.dolittle.com http://bifrost.dolittle.com
- 36. Thanks for your attention