[Solved] Consider this pseudo-code for event-based cache invalidation: if (dataChangedEvent) { invalidateCache(key); } return getCachedData(key); What will happen if dataChangedEvent is true? | Rest API

Rest API - Caching Strategies

Consider this pseudo-code for event-based cache invalidation:

if (dataChangedEvent) {
  invalidateCache(key);
}
return getCachedData(key);

What will happen if dataChangedEvent is true?

ACache is invalidated and fresh data is fetched next time

BCache remains unchanged and stale data is returned

CCache is updated without invalidation

DAn error occurs because cache cannot be invalidated

Step-by-Step Solution

Solution:

Step 1: Analyze the condition
If dataChangedEvent is true, invalidateCache(key) runs, removing cached data.
Step 2: Understand cache behavior after invalidation
After invalidation, next data fetch will get fresh data, not stale cache.
Final Answer:
Cache is invalidated and fresh data is fetched next time -> Option A
Quick Check:
Event triggers invalidation = fresh data next fetch [OK]

Quick Trick: Event true means cache cleared for fresh data [OK]

Common Mistakes:

MISTAKES

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