Talk presented at Functional Conference in Bangalore 15th Nov. 2019.

2. Agenda The need to change
From monolith to bounded contexts
Actor model
F# with Giraffe and Orleans

3. About me
• Harald Schult Ulriksen
• Doing software since y2k was a problem
• Works as a consultant @ Aurum AS
• Currently on personalization for the
Norwegian Broadcasting Corporation
hsulriksen

8. 5.3 million

18. Any organization that
designs a system … will
produce a design whose
structure is a copy of the
organization's
communication structure.
- Conway’s law
https://vimeo.com/371384897

20. Childrens TV Radio TV

22. Technical enablers
• From database sync as integration point to
messages and events
• Static code analysis (ndepend)
• Routing and strangling Nginx + Varnish
• Hypermedia
• Separate build/deployment pipelines (fake)
• Cloud self service – with cost monitoring
https://www.youtube.com/watch?v=bkYDI-5IQdc

27. My content

30. My content
Continue watching
History

35. Redis
SQL
CosmosDB & Graph API
Actor modelling
Serverless (functions/lambda)

36. Can a
user
favorites
sort
themself?

37. Actor model

38. is a mathematical model of concurrent
computation that treats "actors" as the
universal primitives of concurrent
computation.

39. WAT

40. Object oriented programming
done right

41. identity
user/arjun.rampal

42. identity + behavior
user/arjun.rampal
class User : Grain, IUser

43. identity + behavior [+ state]
in-memory,
persisted, or
stateless
class User : Grain, IUser
user/arjun.rampal

48. Grains
• Virtual Actor
• Fundamental building block, model objects in
the domain
• Effectively: Distributed Object
• Unit of computation + state
• Send/receive messages
• React to incoming messages
• Select an appropriate granularity
https://www.youtube.com/watch?time_continue=1426&v=Cj_jUHCXE3U

51. Frontends Backend servers Storage

52. Frontends Actor-based Middle Tier Storage

54. Code demo
Visual Studio code
F#
Giraffe
Microsoft Orleans
Azure storage

55. C:sourcefnconf
λ
dotnet new console –lang F# -n GiraffeOrleans
cd GiraffeOrleans
dotnet new tool-manifest
dotnet tool install packet
dotnet paket init
dotnet paket add Microsoft.Extensions.Hosting –p GiraffeOrleans.fsproj
dotnet paket add Fsharp.Core –p GiraffeOrleans.fsproj
dotnet paket add TaskBuilder.fs –p GiraffeOrleans.fsproj
dotnet paket add Microsoft.Orleans.Server –p GiraffeOrleans.fsproj
dotnet paket add Microsoft.Orleans.OrleansCodeGenerator –p GiraffeOrleans.fsproj
dotnet paket add OrleansDashboard –p GiraffeOrleans.fsproj
code .

56. Code sample + recipe
http://github.com/ulriksen/fnconf
Questions?