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

1. Introduction to RabbitMQ
AlvaroVidela - Pivotal / RabbitMQ
Friday, September 13, 13

2. AlvaroVidela
• Developer Advocate at Pivotal / RabbitMQ
• Co-Author of RabbitMQ in Action
• Creator of the RabbitMQ Simulator
• Blogs about RabbitMQ Internals: http://videlalvaro.github.io/internals.html
• @old_sound | avidela@gopivotal.com
github.com/videlalvaro
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3. About Me
Co-authored
RabbitMQ in Action
http://bit.ly/rabbitmq
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4. Why do we
need messaging?
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5. Classic Web Apps
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6. Implement a
Photo Gallery
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7. Two Parts:
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8. Pretty Simple
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9. ‘Till new
requirements arrive
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10. The Product Owner
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11. Can we also notify the user
friends when she uploads a new
image?
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12. Can we also notify the user
friends when she uploads a new
image?
I forgot to mention we need it for tomorrow…
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13. The Social Media Guru
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14. We need to give badges to
users for each picture upload
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15. We need to give badges to
users for each picture upload
and post uploads to Twitter
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16. The Sysadmin
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17. Dumb!You’re delivering full size
images!
The bandwidth bill has tripled!
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18. Dumb!You’re delivering full size
images!
The bandwidth bill has tripled!
We need this fixed for yesterday!
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19. The Developer in the other
team
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20. I need to call your Java stuff but
from Python
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21. I need to call your Java stuff but
from Python
And also PHP starting next week
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22. The User
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23. I don’t want to wait
till your app resizes
my image!
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24. You
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25. (╯°□°）╯︵ ┻━┻
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26. Let’s see the
code evolution
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27. %% image_controller
handle('PUT', "/user/image", ReqData) ->
image_handler:do_upload(ReqData:get_file()),
ok.
Pseudo Code
Comments
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28. %% image_controller
handle('PUT', "/user/image", ReqData) ->
image_handler:do_upload(ReqData:get_file()),
ok.
Pseudo Code
Function Name
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29. %% image_controller
handle('PUT', "/user/image", ReqData) ->
image_handler:do_upload(ReqData:get_file()),
ok.
Pseudo Code
Arguments
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30. %% image_controller
handle('PUT', "/user/image", ReqData) ->
image_handler:do_upload(ReqData:get_file()),
ok.
Pseudo Code
Function Body
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31. %% image_controller
handle('PUT', "/user/image", ReqData) ->
image_handler:do_upload(ReqData:get_file()),
ok.
Pseudo Code
ReturnValue
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32. %% image_controller
handle('PUT', "/user/image", ReqData) ->
image_handler:do_upload(ReqData:get_file()),
ok.
First Implementation:
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33. %% image_controller
handle('PUT', "/user/image", ReqData) ->
{ok, Image} = image_handler:do_upload(ReqData:get_file()),
resize_image(Image),
ok.
Second Implementation:
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34. %% 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.
Third Implementation:
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35. %% 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.
Fourth Implementation:
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36. %% 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.
Final Implementation:
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37. Can our code scale to new
requirements?
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38. What if
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39. • We need to speed up image conversion
What if
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40. • We need to speed up image conversion
• User notifications sent by email
What if
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41. • We need to speed up image conversion
• User notifications sent by email
• Stop tweeting about new images
What if
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42. • We need to speed up image conversion
• User notifications sent by email
• Stop tweeting about new images
• Resize in different formats
What if
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43. • 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)
What if
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44. Can we do better?
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45. Sure.
Using messaging
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46. Design
Publish / Subscribe Pattern
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47. %% 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).
First Implementation:
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48. %% 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).
First Implementation:
%% friends notifier
on('new_image', Msg) ->
notify_friends(Msg.user, Msg.image).
Friday, September 13, 13

49. %% 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).
First Implementation:
%% friends notifier
on('new_image', Msg) ->
notify_friends(Msg.user, Msg.image).
%% points manager
on('new_image', Msg) ->
add_points(Msg.user, 'new_image').
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50. %% 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).
First Implementation:
%% 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).
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51. Second Implementation:
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52. Second Implementation:
THIS PAGE INTENTIONALLY LEFT BLANK
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53. What is RabbitMQ
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54. RabbitMQ
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55. RabbitMQ
• Multi Protocol Messaging Server
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56. RabbitMQ
• Multi Protocol Messaging Server
• Open Source (MPL)
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57. RabbitMQ
• Multi Protocol Messaging Server
• Open Source (MPL)
• Polyglot
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58. RabbitMQ
• Multi Protocol Messaging Server
• Open Source (MPL)
• Polyglot
• Written in Erlang/OTP
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59. Multi Protocol
http://bit.ly/rmq-protocols
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60. Polyglot
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61. Polyglot
• Java
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62. Polyglot
• Java
• node.js
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63. Polyglot
• Java
• node.js
• Erlang
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64. Polyglot
• Java
• node.js
• Erlang
• PHP
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65. Polyglot
• Java
• node.js
• Erlang
• PHP
• Ruby
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66. Polyglot
• Java
• node.js
• Erlang
• PHP
• Ruby
• .Net
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67. Polyglot
• Java
• node.js
• Erlang
• PHP
• Ruby
• .Net
• Haskell
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68. Polyglot
Even COBOL!!!11
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69. Some users of RabbitMQ
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70. Some users of RabbitMQ
• Instagram
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71. Some users of RabbitMQ
• Instagram
• Indeed.com
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72. Some users of RabbitMQ
• Instagram
• Indeed.com
• MailboxApp
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73. Some users of RabbitMQ
• Instagram
• Indeed.com
• MailboxApp
• Mercado Libre
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74. Friday, September 13, 13

75. Messaging with RabbitMQ
A demo with the RabbitMQ Simulator
https://github.com/RabbitMQSimulator/RabbitMQSimulator
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76. Thanks
AlvaroVidela - @old_sound
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