Building reliable applications with messaging

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Dennis van der Stelt is a software architect with almost 20 years of experience developing distributed systems. He provides coaching and training on topics like messaging concepts, architecture, and eventual consistency. His presentation covered key messaging concepts like how asynchronous messaging reduces coupling, patterns like sagas for long-running processes, and how eventual consistency is an acceptable approach for distributed systems.

Technology

Dennis van der Stelt
and building better & more reliable systems
Dennis van der Stelt
Software Architect
http://dennis.bloggingabout.net/
dennis@bloggingabout.net
NServiceBus Community Champ
MESSAGING
@dvdstelt
#blaak

Dennis van der Stelt
YOUR PRESENTER
Dennis van der Stelt
http://dennis.bloggingabout.net/
Software Architect
Professional Services
Provides coaching & training
About Dennis
Innovative software architect
Almost 20 years of experience in development of
distributed systems. Has a continuous drive to
learn and improve knowledge in different
architectural styles, including quality in software
development. Highly motivated to share his
knowledge via articles, presentations and his
blog.
Awards
NServiceBus Champ
Typemock MVP
Certified Trainer
• Presentations
• Software & Architecture audits
• SOA & Microservices advice
• Unit Testing training
• NServiceBus training

Dennis van der Stelt
“You know nothing, Jon Snow”

Dennis van der Stelt5
Messaging concepts
What is it about & why is it important?

Dennis van der Stelt
synchronous asynchronousvs

Dennis van der Stelt
Separation of concerns
Flexibility & Reusability
Scalability
why all the layers?

Dennis van der Stelt
A monolithic design is characterized by such tight coupling
among modules that they really have no independent existence.
monolithic

Dennis van der Stelt
MONOLITHIC DESIGN
How does my clean code become a big ball of mud?
Database

Dennis van der Stelt
COUPLING
Which layer has the
worst coupling?

Dennis van der Stelt
SpatialTemporalPlatform
coupling aspects

Dennis van der Stelt
PLATFORM
Also known as ‘interoperability’
http, json, xml, xsd, etc…

Dennis van der Stelt
TEMPORAL
Store Front End Shipping Service

Dennis van der Stelt
TEMPORAL
Store Front End Shipping ServiceShipping Service

Dennis van der Stelt
TEMPORAL
Store Front End Shipping ServiceOrder Queue

Dennis van der Stelt
SPATIAL .net
application
.net application
ShipOrder AssignTask

Dennis van der Stelt
Messaging
 Reduces spatial coupling
 XML/JSON for platform coupling
 Asynchronous for temporal coupling

Dennis van der Stelt
PERFORMANCE
RPC versus Messaging

Dennis van der Stelt36
Architecture
We do microservices, ‘cause this time
it is the silver bullet!

Dennis van der Stelt
SERVICE ORIENTATION AT RUNTIME

Dennis van der Stelt
Don’t do request/reply

Dennis van der Stelt
Don’t use asynchronous
messaging to query a datastore
for displaying purposes!
Everything has its place.
Messaging isn’t a silver bullet
you use for everything.

Dennis van der Stelt
CAP Theorem
Eric Brewer, PODC Conference 2000

Dennis van der Stelt
CAP THEOREM
You can only pick 2

Dennis van der Stelt
CAP THEOREM
You can only pick 2
centralized
system
partition tolerantconsistencyavailability

Dennis van der Stelt
CAP THEOREM
You can only pick 2
centralized
system
partition tolerantconsistencyavailability
distributed
system
partition tolerantconsistencyavailability

Dennis van der Stelt
Match the business perspective

Dennis van der Stelt
But I can’t drop consistency!

Dennis van der Stelt
Basically Available
BASE
What is BASE?
Soft state
Eventually consistent

Dennis van der Stelt
Eventual Consistency
Because 100% consistency isn’t the only option

Dennis van der Stelt
Eventual Consistency

Dennis van der Stelt
Eventual Consistency
your “enterprise” is already eventual consistent with reality

Dennis van der Stelt
“Allow things to be inconsistent and find ways to
compensate for mistakes, versus trying to prevent
mistakes altogether.”
EVENTUAL CONSISTENCY
Eric Brewer
VP of Infrastructure at Google, Professor at UC Berkeley

Dennis van der Stelt
Some ideas on messaging

Dennis van der Stelt
100% synchronized
that‘s eventual consistency.
Udi Dahanin 2010

Dennis van der Stelt
Sagas
Long running processes

Dennis van der Stelt
Death to the batchjob

Dennis van der Stelt
Asynchronous messaging helps achieve
decoupling at design- & runtime
There’s a lot to think about, designing an
eventual consistent distributed system.
Everyone needs to think about the CAP
Theorem, etc, with or without async messaging
Conclusion

Dennis van der Stelt
find me.
http://dennis.bloggingabout.net
dvdstelt@outlook.com

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Building reliable applications with messaging

1. Dennis van der Stelt and building better & more reliable systems Dennis van der Stelt Software Architect http://dennis.bloggingabout.net/ dennis@bloggingabout.net NServiceBus Community Champ MESSAGING @dvdstelt #blaak

2. Dennis van der Stelt YOUR PRESENTER Dennis van der Stelt http://dennis.bloggingabout.net/ Software Architect Professional Services Provides coaching & training About Dennis Innovative software architect Almost 20 years of experience in development of distributed systems. Has a continuous drive to learn and improve knowledge in different architectural styles, including quality in software development. Highly motivated to share his knowledge via articles, presentations and his blog. Awards NServiceBus Champ Typemock MVP Certified Trainer • Presentations • Software & Architecture audits • SOA & Microservices advice • Unit Testing training • NServiceBus training

3. Dennis van der Stelt AGENDA

4. Dennis van der Stelt “You know nothing, Jon Snow”

5. Dennis van der Stelt5 Messaging concepts What is it about & why is it important?

6. Dennis van der Stelt

7. Dennis van der Stelt

8. Dennis van der Stelt synchronous asynchronousvs

9. Dennis van der Stelt

10. Dennis van der Stelt

11. Dennis van der Stelt

12. Dennis van der Stelt Separation of concerns Flexibility & Reusability Scalability why all the layers?

13. Dennis van der Stelt A monolithic design is characterized by such tight coupling among modules that they really have no independent existence. monolithic

14. Dennis van der Stelt MONOLITHIC DESIGN How does my clean code become a big ball of mud? Database

15. Dennis van der Stelt MONOLITHIC DESIGN How does my clean code become a big ball of mud? Database

16. Dennis van der Stelt

17. Dennis van der Stelt

18. Dennis van der Stelt

19. Dennis van der Stelt

20. Dennis van der Stelt COUPLING Which layer has the worst coupling?

21. Dennis van der Stelt

22. reduce coupling

23. Dennis van der Stelt SpatialTemporalPlatform coupling aspects

24. Dennis van der Stelt PLATFORM Also known as ‘interoperability’ http, json, xml, xsd, etc…

25. Dennis van der Stelt TEMPORAL Store Front End Shipping Service

26. Dennis van der Stelt TEMPORAL Store Front End Shipping ServiceShipping Service

27. Dennis van der Stelt TEMPORAL Store Front End Shipping ServiceOrder Queue

28. Dennis van der Stelt TEMPORAL Store Front End Shipping ServiceOrder Queue

29. Dennis van der Stelt TEMPORAL Store Front End Shipping ServiceOrder Queue

30. Dennis van der Stelt SPATIAL

31. Dennis van der Stelt SPATIAL .net application .net application ShipOrder AssignTask

32. Dennis van der Stelt Messaging  Reduces spatial coupling  XML/JSON for platform coupling  Asynchronous for temporal coupling

33. demo Messaging using WCF

34. Dennis van der Stelt PERFORMANCE RPC versus Messaging

35. Dennis van der Stelt36 Architecture We do microservices, ‘cause this time it is the silver bullet!

36. Dennis van der Stelt

37. Dennis van der Stelt SERVICE ORIENTATION AT RUNTIME

38.

39.

40. Dennis van der Stelt Don’t do request/reply

41. Dennis van der Stelt

42. Dennis van der Stelt Don’t use asynchronous messaging to query a datastore for displaying purposes! Everything has its place. Messaging isn’t a silver bullet you use for everything.

43. demo NServiceBus Demo

44. Dennis van der Stelt CAP Theorem Eric Brewer, PODC Conference 2000

45. Dennis van der Stelt CAP THEOREM You can only pick 2

46. Dennis van der Stelt CAP THEOREM You can only pick 2 centralized system partition tolerantconsistencyavailability

47. Dennis van der Stelt CAP THEOREM You can only pick 2 centralized system partition tolerantconsistencyavailability

48. Dennis van der Stelt CAP THEOREM You can only pick 2 centralized system partition tolerantconsistencyavailability distributed system partition tolerantconsistencyavailability

49. Dennis van der Stelt CAP THEOREM You can only pick 2 centralized system partition tolerantconsistencyavailability distributed system partition tolerantconsistencyavailability when there’s network partition, which do you sacrifice?

50. Dennis van der Stelt Match the business perspective

51. Dennis van der Stelt

52. Dennis van der Stelt

53. Dennis van der Stelt

54. Dennis van der Stelt But I can’t drop consistency!

55. Dennis van der Stelt Basically Available BASE What is BASE? Soft state Eventually consistent

56. Dennis van der Stelt Eventual Consistency Because 100% consistency isn’t the only option

57. Dennis van der Stelt

58. Dennis van der Stelt Eventual Consistency

59. Dennis van der Stelt Eventual Consistency

60. Dennis van der Stelt Eventual Consistency your “enterprise” is already eventual consistent with reality

61. Dennis van der Stelt Eventual Consistency your “enterprise” is already eventual consistent with reality

62. Dennis van der Stelt “Allow things to be inconsistent and find ways to compensate for mistakes, versus trying to prevent mistakes altogether.” EVENTUAL CONSISTENCY Eric Brewer VP of Infrastructure at Google, Professor at UC Berkeley

63. Dennis van der Stelt Some ideas on messaging

64. Dennis van der Stelt 100% synchronized that‘s eventual consistency. Udi Dahanin 2010

65. Dennis van der Stelt Sagas Long running processes

66. Dennis van der Stelt Death to the batchjob

67. Dennis van der Stelt

68. Dennis van der Stelt

69. Dennis van der Stelt

70. Dennis van der Stelt

71. Dennis van der Stelt

72. Dennis van der Stelt

73. Dennis van der Stelt

74. Dennis van der Stelt

75. Dennis van der Stelt

76. Dennis van der Stelt

77. Dennis van der Stelt

78. Dennis van der Stelt

79. Dennis van der Stelt

80. Dennis van der Stelt

81. demo NServiceBus Saga demo

82. Dennis van der Stelt Asynchronous messaging helps achieve decoupling at design- & runtime There’s a lot to think about, designing an eventual consistent distributed system. Everyone needs to think about the CAP Theorem, etc, with or without async messaging Conclusion

83. Dennis van der Stelt

84. Dennis van der Stelt find me. http://dennis.bloggingabout.net dvdstelt@outlook.com

Building reliable applications with messaging

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