[Solved] A developer wrote this code snippet for event communication: eventBus.publish('UserCreated', userData); userService.... What is the main problem with this approach regarding decoupling? | Microservices

Microservices - Event-Driven Architecture

A developer wrote this code snippet for event communication:

eventBus.publish('UserCreated', userData);
userService.createUser(userData);

What is the main problem with this approach regarding decoupling?

AThe event is published before the user is created, causing inconsistency

BThe userService call is synchronous, blocking the event publishing

CThe eventBus and userService are tightly coupled by calling both directly

DThere is no problem; this is a fully decoupled event-driven design

Step-by-Step Solution

Solution:

Step 1: Check event timing relative to action
The event 'UserCreated' is published before the actual user creation happens.
Step 2: Understand impact on consistency and decoupling
This can cause other services to react to an event for a user that does not yet exist, breaking consistency and decoupling principles.
Final Answer:
The event is published before the user is created, causing inconsistency -> Option A
Quick Check:
Publish event after action = D [OK]

Quick Trick: Publish events only after the action completes [OK]

Common Mistakes:

MISTAKES

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A developer wrote this code snippet for event communication: