Hard Resilience Patterns

Circuit Breaker Simulation

Simulate a circuit breaker. Create a call counter and a function callService() that:

- Calls 1-3: return error "Service down"

- Calls 4+: return "Service recovered"

Use retry(3) and doOnError to log each failure. Print the final result.

Expected

Failed: Service down (call 1)
Failed: Service down (call 2)
Failed: Service down (call 3)
Service recovered

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Main.kt

Circuit Breaker Simulation

hard⏱ 15 minkotlinreactorchallengeresilience

Simulate a circuit breaker. Create a call counter and a function callService() that:

Calls 1-3: return error "Service down"
Calls 4+: return "Service recovered"

Use retry(3) and doOnError to log each failure. Print the final result.

Why this works

This simulates a circuit breaker pattern. The service fails for the first 3 calls, then recovers. retry(3) allows 3 retries (4 total attempts). doOnError logs each failure, providing visibility into the retry behavior.

Expected output

Failed: Service down (call 1)
Failed: Service down (call 2)
Failed: Service down (call 3)
Service recovered

Circuit Breaker Simulation

Simulate a circuit breaker. Create a call counter and a function callService() that:

- Calls 1-3: return error "Service down"

- Calls 4+: return "Service recovered"

Use retry(3) and doOnError to log each failure. Print the final result.

Expected

Failed: Service down (call 1) Failed: Service down (call 2) Failed: Service down (call 3) Service recovered

Circuit Breaker Simulation

hard⏱ 15 minkotlinreactorchallengeresilience

Simulate a circuit breaker. Create a call counter and a function callService() that:

Calls 1-3: return error "Service down"

Calls 4+: return "Service recovered"

Use retry(3) and doOnError to log each failure. Print the final result.

Why this works

Expected output

Failed: Service down (call 1) Failed: Service down (call 2) Failed: Service down (call 3) Service recovered