Inter-Service Communication Patterns

Explain the trade-offs between synchronous and asynchronous communication patterns.

Implement declarative synchronous communication using OpenFeign, including timeout and retry configurations.

Implement asynchronous, non-blocking communication using WebClient.

Explain the role of a service registry and compare client-side vs. server-side discovery patterns.

Implement an API Gateway using Spring Cloud Gateway for routing, rate limiting, and request transformation.

Implement the Circuit Breaker pattern with a fallback mechanism using Resilience4j to prevent cascading failures.

Implement the Retry pattern with exponential backoff and jitter using Resilience4j to handle transient faults.

Implement the Bulkhead pattern using Resilience4j to isolate service dependencies and prevent resource exhaustion.