Messaging System with Spring Boot dan RabbitMQ

1. Messaging System with
RabbitMQ & Spring Boot
Firman .

2. Without Messaging System
● To many integrations point and different implementation like:
○ Data protokol: data link / Api / Files/Ftp
○ Data Format: JSON / CSV / XML
○ Need to maintain the connections
App 1 App 2 App 3 App 4
App 5 App 6 App 7 App 8

3. RabbitMQ
App 1 App 2 App 3 App 4
App 5 App 6 App 7 App 8
Messaging System

4. Basic Concepts

5. Queue & Exchange
1. Queue :
Is a line that store message
1. Exchanges :
Routing message to Queue
1. Routing Key :
A key that the exchange looks
to decide how to route the
message to queue
1. Binding :
A link between exchange to
queue

6. Exchanges
1. Fanout Exchange
2. Direct Exchange
3. Topic Exchange
….

7. Fanout
Multiple
queues
for single
message

8. Direct
Send to
selective queue
with Single
Criteria routing

9. Topic
Send to
selective queue
with multiple
Criteria routing

10. Topic RabbitMQ Rules
Key and Message
that sent to RabbitMQ
Topic
Exchange
Routing Key
(using wild
card)
Queues
Routing Key
(source.size.type)
JSON Data
x.picture
mobile.# q.picture.mobile mobile.small.jpg
{
"name": "Picture0",
"type": "jpg",
"source": "mobile",
"size": "small"
}
*.*.svg q.picture.vector web.large.svg
{
"name": "Picture5",
"type": "svg",
"source": "web",
"size": "large"
}
*.large.svg q.picture.large web.large.svg
{
"name": "Picture5",
"type": "svg",
"source": "web",
"size": "large"
}

11. How to Create Exchange

12. How to Create Queue

13. How to Bind Exchange and the Queues

14. Spring Boot : Dependencies & Properties
build.gradle
pom.xml
application.yml

15. Spring Boot : Producer (Type: Direct Exchange)

16. Spring Boot : Consumer

17. RabbitMQ : Messages

18. Spring Boot : Log Producer

19. Spring Boot : Log Consumer

20. Handling Exception on Consumer
1. DLX (Dead Letter Exchange)
2. TTL (Time to Live)
….

21. DLX (Dead Letter Exchange)
● Exception might happened
● Spring will re-queue by default
● ….

22. TTL (Time to Live)
● Set time to live for the Queue
● When there’s no consumer, it will
gone
● ….

23. How to Implement DLX
Create 2 Exchanges:
Create 2 Queues:
Normal queue,
for dead letter
queue

24. Binding the DLX

25. How to Implement TTL
Create the Queue with argument Message TTL and set it 10 seconds (10.000 ms)

26. Manual Acknowledge
Update Application.yml
Will go to DLX if
we define the
DLX, else the
queue just gone
Will rem0ve the
queue or the
queue is done
Spring by default will automatically Ack.
But when we have THROWS Exception,
the consumer will consume invalid message with
infinite loop.

27. Retry Mechanism (when consume the Queue)
View log on Gist
Consume Log Time Time Diff (s)
First 2020-08-09 19:02:47.928 0s
Second 2020-08-09 19:02:50.943 3s (3x1)
Third 2020-08-09 19:02:56.945 6s (3x2)
Fourth 2020-08-09 19:03:06.951 10s (max-interval)
Fifth 2020-08-09 19:03:16.954 10s (max-interval)

28. well done, thanks
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