Daniel Marbach shows the differences between theory and practice when building a reliable message pump that consumes and produces messages from queues.

1. DIY Async Message Pump
Lessons from the trenches

2. BackFront
WCF Services Windows Service
DMZ Backend
Storage
ADO.NETRPC
Refund / Query Read / Write
DB Cluster

3. The RPC callstack of

4. praise the lords of
messaging

5. Back
Front
WCF Services
Windows Service
DMZ Backend
Storage
ADO.NET
Read / Write
Queues
DB Cluster
Messaging Cluster
Cache Subscriber
Query

6. Build
or
Buy

7. Back
Front
WCF Services
Windows Service
DMZ Backend
Storage
ADO.NET
Read / Write
Queues
DB Cluster
Messaging Cluster
Cache Subscriber
Query
Sending
Receiving
Publishing

8. Building the

9. var (payload, headers)= Serialize(message);
await queue.Send(payload, headers);
Easy!

10. TPL handwaving
Cooporative cancellation 101
Async / Await
Ship it!
It worked until

11. Rush hour

12. Pump Handler

13. concurrency
Let’s throw in some

14. Just a tiny change…
Introduce Fire & Forget
Ship it!
It worked until

15. Rush hour

16. Pump Storage
DB Cluster

17. concurrency
Better limit

18. Semaphore controls floodgate
Ship it!
It worked

19. As time passes

20. flextensible
Make it

21. https://www.americanroadmagazine.com/forum/gallery/image/1754-crazy-car-hi-res/https://www.ala.co.uk/connect/top-10-crazy-cars/

22. transactions
Life beyond

23. Destination2
Storage
Pump
Tx Start
Tx Commit / Abort
Destination1
Your Code

24. Destination2
Storage
Pump
Tx Start
Tx Commit / Abort
Destination1
Your Code

25. Destination2
Storage
Pump
Tx Start
Tx Commit / Abort
Destination1
Failed
Successful

26. Destination2
Storage
Pump
Tx Start
Tx Commit / Abort
Destination1
Your Code

27. Cloudy with a chance of
ailur
e

28. Pump Handler

29. Destination2
Storage
Pump
Tx Start
Tx Commit / Abort
Destination1
Your Code
D1 D2

30. Penny Pinching

31. basic bits
Now we have the

32. Living on the edge of sanity

33. Sorry pal but we got a problem in prod.
Should I call your spouse or will you?

34. insights
I want

35. Sure you can do surgery on yourself
What could go wrong...

36. Thanks

37. go.particular.net/
nsbstart

38. go.particular.net/demo

39. github.com/danielmarbach/MessagePump
Slides, Links…

40. Q & A

41. Software Engineer
Enthusiastic Software Engineer
Microsoft MVP
@danielmarbach
particular.net/blog
planetgeek.ch

42. Thanks