Talk given at PHPUK 13. The Pub/Sub Pattern image form slide 51 is taken from here: http://www.eaipatterns.com/PublishSubscribeChannel.html

1. RabbitMQ Hands On
Álvaro Videla - VMware
Monday, February 25, 13

2. About Me
• Developer Advocate for Cloud Foundry
• Blog: http://videlalvaro.github.com/
• Twitter: @old_sound
Monday, February 25, 13

3. About Me
• Developer Advocate for Cloud Foundry
• Blog: http://videlalvaro.github.com/
• Twitter: @old_sound
• I created gifsockets™
Monday, February 25, 13

4. About Me
Co-authored
RabbitMQ in Action
http://bit.ly/rabbitmq
Monday, February 25, 13

5. Why do you
need messaging?
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6. Classic Web Apps
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7. Implement a
Photo Gallery
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8. Two Parts:
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9. Pretty Simple
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10. ‘Till new
requirements arrive
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11. The Product Owner
Monday, February 25, 13

12. Can we also notify the
user friends when she
uploads a new image?
Monday, February 25, 13

13. Can we also notify the
user friends when she
uploads a new image?
I forgot to mention we need it for tomorrow…
Monday, February 25, 13

14. Monday, February 25, 13

15. The Social Media Guru
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16. We need to give badges
to users for each
picture upload
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17. We need to give badges
to users for each
picture upload
and post uploads to Twitter
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18. Monday, February 25, 13

19. The Sysadmin
Monday, February 25, 13

20. Dumb! You’re delivering
full size images!
The bandwidth bill has
tripled!
Monday, February 25, 13

21. Dumb! You’re delivering
full size images!
The bandwidth bill has
tripled!
We need this fixed for yesterday!
Monday, February 25, 13

22. Monday, February 25, 13

23. The Developer in the
other team
Monday, February 25, 13

24. I need to call your PHP
stuff but from Python
Monday, February 25, 13

25. I need to call your PHP
stuff but from Python
And also Java starting next week
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26. Monday, February 25, 13

27. The User
Monday, February 25, 13

28. I don’t want to wait
till your app resizes
my image!
Monday, February 25, 13

29. You
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30. Monday, February 25, 13

31. Let’s see the
code evolution
Monday, February 25, 13

32. Pseudo Code
Comments
%% image_controller
handle('PUT', "/user/image", ReqData) ->
image_handler:do_upload(ReqData:get_file()),
ok.
Monday, February 25, 13

33. Pseudo Code
Function Name
%% image_controller
handle('PUT', "/user/image", ReqData) ->
image_handler:do_upload(ReqData:get_file()),
ok.
Monday, February 25, 13

34. Pseudo Code
Arguments
%% image_controller
handle('PUT', "/user/image", ReqData) ->
image_handler:do_upload(ReqData:get_file()),
ok.
Monday, February 25, 13

35. Pseudo Code
Function Body
%% image_controller
handle('PUT', "/user/image", ReqData) ->
image_handler:do_upload(ReqData:get_file()),
ok.
Monday, February 25, 13

36. Pseudo Code
Return Value
%% image_controller
handle('PUT', "/user/image", ReqData) ->
image_handler:do_upload(ReqData:get_file()),
ok.
Monday, February 25, 13

37. First Implementation:
%% image_controller
handle('PUT', "/user/image", ReqData) ->
image_handler:do_upload(ReqData:get_file()),
ok.
Monday, February 25, 13

38. Second Implementation:
%% image_controller
handle('PUT', "/user/image", ReqData) ->
{ok, Image} = image_handler:do_upload(ReqData:get_file()),
resize_image(Image),
ok.
Monday, February 25, 13

39. Third Implementation:
%% image_controller
handle('PUT', "/user/image", ReqData) ->
{ok, Image} = image_handler:do_upload(ReqData:get_file()),
resize_image(Image),
notify_friends(ReqData:get_user()),
ok.
Monday, February 25, 13

40. Fourth Implementation:
%% image_controller
handle('PUT', "/user/image", ReqData) ->
{ok, Image} = image_handler:do_upload(ReqData:get_file()),
resize_image(Image),
notify_friends(ReqData:get_user()),
add_points_to_user(ReqData:get_user()),
ok.
Monday, February 25, 13

41. Final Implementation:
%% image_controller
handle('PUT', "/user/image", ReqData) ->
{ok, Image} = image_handler:do_upload(ReqData:get_file()),
resize_image(Image),
notify_friends(ReqData:get_user()),
add_points_to_user(ReqData:get_user()),
tweet_new_image(User, Image),
ok.
Monday, February 25, 13

42. Can our code scale to
new requirements?
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43. What if
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44. What if
• We need to speed up image conversion
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45. What if
• We need to speed up image conversion
• User notifications sent by email
Monday, February 25, 13

46. What if
• We need to speed up image conversion
• User notifications sent by email
• Stop tweeting about new images
Monday, February 25, 13

47. What if
• We need to speed up image conversion
• User notifications sent by email
• Stop tweeting about new images
• Resize in different formats
Monday, February 25, 13

48. What if
• We need to speed up image conversion
• User notifications sent by email
• Stop tweeting about new images
• Resize in different formats
• Swap Language / Technology (No Down
Time)
Monday, February 25, 13

49. Can we do better?
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50. Sure.
Using messaging
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51. Design
Publish / Subscribe Pattern
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52. First Implementation:
%% image_controller
handle('PUT', "/user/image", ReqData) ->
{ok, Image} = image_handler:do_upload(ReqData:get_file()),
Msg = #msg{user = ReqData:get_user(), image = Image},
publish_message('new_image', Msg).
Monday, February 25, 13

53. First Implementation:
%% image_controller
handle('PUT', "/user/image", ReqData) ->
{ok, Image} = image_handler:do_upload(ReqData:get_file()),
Msg = #msg{user = ReqData:get_user(), image = Image},
publish_message('new_image', Msg).
%% friends notifier
on('new_image', Msg) ->
notify_friends(Msg.user, Msg.image).
Monday, February 25, 13

54. First Implementation:
%% image_controller
handle('PUT', "/user/image", ReqData) ->
{ok, Image} = image_handler:do_upload(ReqData:get_file()),
Msg = #msg{user = ReqData:get_user(), image = Image},
publish_message('new_image', Msg).
%% friends notifier
on('new_image', Msg) ->
notify_friends(Msg.user, Msg.image).
%% points manager
on('new_image', Msg) ->
add_points(Msg.user, 'new_image').
Monday, February 25, 13

55. First Implementation:
%% image_controller
handle('PUT', "/user/image", ReqData) ->
{ok, Image} = image_handler:do_upload(ReqData:get_file()),
Msg = #msg{user = ReqData:get_user(), image = Image},
publish_message('new_image', Msg).
%% friends notifier
on('new_image', Msg) ->
notify_friends(Msg.user, Msg.image).
%% points manager
on('new_image', Msg) ->
add_points(Msg.user, 'new_image').
%% resizer
on('new_image', Msg) ->
resize_image(Msg.image).
Monday, February 25, 13

56. Second Implementation:
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57. Second Implementation:
THIS PAGE INTENTIONALLY LEFT BLANK
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58. Monday, February 25, 13

59. Messaging and
RabbitMQ
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60. RabbitMQ
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61. RabbitMQ
• Multi Protocol Messaging Server
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62. RabbitMQ
• Multi Protocol Messaging Server
• Open Source (MPL)
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63. RabbitMQ
• Multi Protocol Messaging Server
• Open Source (MPL)
• Part of Spring Source
Monday, February 25, 13

64. RabbitMQ
• Polyglot
• Multi Protocol
• Open Source (MPL)
• Written in Erlang/OTP
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65. Multi Protocol
http://bit.ly/rmq-protocols
Monday, February 25, 13

66. Polyglot
• PHP
• node.js
• Erlang
• Java
• Ruby
• .Net
• Haskell
Monday, February 25, 13

67. TELL ME MORE
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68. CODE OR IT
DIDN’T HAPPEN
http://github.com/videlalvaro/php-amqplib
Monday, February 25, 13

69. Messaging
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70. Scale
Messaging
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71. Scale Decoupling
Messaging
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72. Scale Decoupling
Messaging
Polyglot Apps
Monday, February 25, 13

73. Questions?
Monday, February 25, 13

74. Thanks!
@old_sound
Monday, February 25, 13