Lab 11 Advanced Microservice Patterns (Bonus)

[foidkiller]

Lab 11 — Advanced Microservice Patterns

• Task 1 done — notifications service and retry logic
• Task 2 done — Circuit Breaker and Rate Limiter
• Bonus Task done — Bulkhead isolation

What's included

• Notifications service with /notify endpoint
• Retry with exponential backoff and jitter
• Circuit Breaker (CLOSED → OPEN → HALF_OPEN)
• Sliding window Rate Limiter
• Bulkhead isolation for payments service
• submissions/lab11.md — tests, observations and results

Results

• Notifications do not block checkout flow
• Retry logic improves success rate during failures
• Circuit Breaker prevents long waits when payments is down
• Rate Limiter protects the service from request bursts
• Bulkhead keeps /events responsive even when payments is slow