messaging - a solution to reduce coupling
TRANSCRIPT
Messaging – A solution to reduce coupling(Robust and Resilient Architecture)
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
How software evolves?
Scenario – A ‘simple’ card payment
In the beginning everything was simple
Scenario – A ‘simple’ card payment
Then we needed to introduce antifraud
checks and update the user profile
Scenario – A ‘simple’ card payment
Then we needed to send an email
acknowledgement to the user
Scenario – A ‘simple’ card payment
Then we needed to check whether the user
was eligible for a bonus
Scenario – A ‘simple’ card payment
Then we needed to check whether we need
to give commission to our affiliates
But what happens if one of the
dependencies fails?
Does everything need to execute in
sequence?
Required
Not required
Does everything need to execute in
sequence?
Message based decoupling
Messaging PatternsCompeting Consumers
Message
Queue
Producer1
Producer2
Producer3
Consumer1
Consumer2
Consumer3
Messaging PatternsPublish / Subscribe
Queue1
Producer1
Producer2
Producer3
Consumer1
Consumer2
Consumer3
Exchange
Queue2
Messaging PatternsRequest / Reply (RPC)
Queue1Requestor1 Replier1Exchange1
Queue2 Exchange2
Messaging Advanced Patterns
• Control Bus
• Detour
• Wire Tap
• Smart Proxy
http://www.eipatterns.com
Possible technologies that can be used
Client Web Servers Message Queue
Worker Server Worker Server
Curious to learn more?
Interested to implement in your solution?
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