​Highly dependent solutions are synonym with requiring extra effort to maintain especially because changes to common modules triggers a ripple effect of changes to other modules. Due to the level of coupling release management becomes more complex, reducing the ability to publish modules independently at any time (continuous delivery). Messaging enables software applications to send data to each other. Robust and reliable systems (aka Reactive Systems) rely on asynchronous message-passing to establish a boundary between components that ensures loose coupling, isolation, location transparency, and provides the means to delegate errors as messages.

1. Messaging – A solution to reduce coupling
(Robust and Resilient Architecture)

2. Less tolerant and resilient to problems
Changes to one module forces a
ripple effect of changes to other modules
Highly dependent solutions
Require more effort to maintain

3. How software evolves?

4. Scenario – A ‘simple’ card payment
In the beginning everything was simple

5. Scenario – A ‘simple’ card payment
Then we needed to introduce antifraud
checks and update the user profile

6. Scenario – A ‘simple’ card payment
Then we needed to send an email
acknowledgement to the user

7. Scenario – A ‘simple’ card payment
Then we needed to check whether the user
was eligible for a bonus

8. Scenario – A ‘simple’ card payment
Then we needed to check whether we need
to give commission to our affiliates

10. But what happens if one of the
dependencies fails?

11. Does everything need to execute in
sequence?

12. Required
Not required
Does everything need to execute in
sequence?

13. Message based decoupling

14. Messaging Patterns
Competing Consumers
Message
Queue
Producer1
Producer2
Producer3
Consumer1
Consumer2
Consumer3

15. Messaging Patterns
Publish / Subscribe
Queue1
Producer1
Producer2
Producer3
Consumer1
Consumer2
Consumer3
Exchange
Queue2

16. Messaging Patterns
Request / Reply (RPC)
Queue1Requestor1 Replier1Exchange1
Queue2 Exchange2

17. Messaging Advanced Patterns
• Control Bus
• Detour
• Wire Tap
• Smart Proxy
http://www.eipatterns.com

18. Possible technologies that can be used
Client Web Servers Message Queue
Worker Server Worker Server

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20. Interested to implement in your solution?

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