apidays LIVE Helsinki & North: API Ecosystems - Connecting Physical and Digital March 16 & 17, 2022 Event Driven Architecture & Serverless Omid Eidivandi, Lead Engineer at Groupe SeLoger

1. Event Driven Design
&
Serverless
Apis future life

2. Omid Eidivandi
About me ?
https://www.linkedin.com/in/eidivandi-omid/
https://twitter.com/Eidivandi
https://github.com/xaaxaax

3. Event Driven Architecture
(EDA)

4. Event Driven Architecture
Decoupled
Resilient
Reduced Complexity
Adaptation
Statelessness

5. 2022 SERIES OF EVENT
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JULY
(HYBRID)
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SEPTEMBER
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APRIL
(VIRTUAL)
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MARCH
(VIRTUAL)
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DECEMBER
(HYBRID)
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OCTOBER
(HYBRID)
Hong Kong
AUGUST
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JUNE (VIRTUAL)
India
MAY
(VIRTUAL)
APRIL (VIRTUAL)
Dubai & Middle East
JUNE
(VIRTUAL)
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6. Event Driven Architecture
Event Producer
Event Router
Event Consumer
Event Consumer
Event Consumer
Event Consumer
Event Consumer
Event Consumer
Event Consumer
Event Consumer
Event Consumer
Event Consumer
Event Consumer

7. Event Driven Architecture
Does not know the process
Just respects api contract
Needs callback or not
Totally decoupled
Event Producer
Subscribed to receive events
Needs event within specific state
Needs consumption contract
Totally decoupled
Event Consumers
Process event
Add value to the event
Evaluate the event state
May need dependencies
Event Router

8. Event Driven Architecture
A Loosely coupled dependency
Order
System
Retail
System
Requester
Push Event Fetch Event and ask to remove
after treatment
Order System can fail Retail System can fail

9. Event Driven Architecture
Two Loosely coupled dependencies
Order
System
Retail
System
Requester
Email
System
The event is lost if
one consumer
process that first

10. Event Driven Architecture
FanOut
Order
System
Retail
System
Requester
Pub/Sub
Email
System
Queue
Queue

11. Event Driven Architecture
Highly coupled dependency
Order
System
Requester Product
System

12. Event Driven Architecture
Callback
Order
System
Requester
Product
System
Async Call
Callback

13. Event Driven Architecture
Carried Transfer State
Order
System
Requester
Product
System
Pub/sub
Queue

14. Event Driven Architecture
Cache
Order
System
Requester
Product
System
cache

15. Serverless

16. Serverless
Auto-Scaled
Secure
Auto Managed
Business Centric
Stateless

17. Serverless
Problem
Order
System
Retail
System
Requester
Pub/Sub
Email
System
Queue
Queue

18. Serverless
Problem
Requester
Pub/Sub
Email Function
Queue
Queue
Order System
Order System
Order System
Order System
Order System
New Order
Function
Email Function
Email Function
Email Function
Email Function
Retail
Retail
Retail
Retail Function

19. Serverless
What to Know
Shared Contexts
Timeout
Concurrency
Cold Start
Memory / CPU

20. EDA & Serverless
Must be considered
As Small as possible functions
Correlated events
Retry / DLQ
Centralized Monitoring Dashboard
Keep track of service errors
Throttling

21. Serverless
NoSQL
Managed
Brokers
Defined
Bounded
Context
Clustered
Brokers
Partitioned
DB
Serverless
DB
Not A
Monolithic

22. Event Driven Architecture
GSL EDA USe Case
Lead
Ingest
Gateway
Add Lead Command
Lead
Event
Broker
NoSql Push Event
Add Lead Command
Add Lead Command
Add Lead Command

23. Event Driven Architecture
GSL EDA Use Case
Lead Event
Broker
Incoming
Event
Queue Classified
Classified
System
Maturity
Customer
Customer
System
Data

24. Event Driven Architecture
GSL EDA USe Case
Lead
DIstribution
Gateway
Add Lead
Lead
Distribution
Broker
Lead
DB
Push Event
Query Function

25. EDA & Serverless
Observability
Real challenge of distributed systems

26. Gateway
EDA & Serverless
DB
Serverless Function
Pub/Sub
Broker
Queue

27. EDA & Serverless
Process G
Process H
Process A Process F
Process E
Process D
Process C
Process B

28. EDA & Serverless
Process G
Process H
Process A Process F
Process E
Process D
Process C
Process B

29. EDA & Serverless
Process G
Process H
Process A Process F
Process E
Process D
Process C
Process B

30. EDA & Serverless
Process G
Process H
Process A Process F
Process E
Process D
Process C
Process B

31. EDA & Serverless
Process G
Process H
Process A Process F
Process E
Process D
Process C
Process B

32. EDA & Serverless
● Analysis
● Detection
● Resolution
Monitoring

33. EDA & Serverless
Analysis

34. EDA & Serverless
Correlating
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35. EDA & Serverless
Tracing
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36. EDA & Serverless
Detection
Structured Logging
Metadata
Useful metrics

37. EDA & Serverless
Structured Logging
{
“Category”: “Product”,
“Reason”: “NotEnoughStock”,
“Message”: “XXXXXXXXXXXXXXXXXX”,
“ProductCode”:”P-REF-1234”,
…..
}

38. EDA & Serverless
Metadata
CorrelationId
RetryAttemps
LastTreatmentTime
…..
Queue
DLQ

39. EDA & Serverless
Metrics
Service Level Indicator (SLI)
Service Level Objective (SLO)
Service Level Agreement (SLA)

40. EDA & Serverless
Thanks