Resilience Patterns.
When ABIS fails, your application shouldn't. Circuit breakers prevent cascade failures, protect system resources, and enable graceful degradation during outages.
The circuit breaker pattern prevents repeated attempts to call a failing service. It operates in three states: CLOSED (normal operation), OPEN (service unavailable, fail fast), and HALF-OPEN (testing if service recovered).
Key parameters: failure threshold (how many failures before opening), timeout duration (how long circuit stays open), success threshold (consecutive successes needed to close from half-open), and failure detection logic (what counts as a failure).
Critical for ABIS integration: circuit breakers enable fail-open behavior (allow requests when ABIS is down), prevent thundering herd (don't all retry simultaneously), and provide observability (metrics on circuit state transitions).
CLOSED
Normal Operation
Requests flow through to ABIS. Failure counter tracks errors. Opens circuit after threshold exceeded.
OPEN
Fast Failure
All requests fail immediately without calling ABIS. Protects downstream service. Automatically transitions to HALF-OPEN after timeout.
HALF-OPEN
Recovery Test
Limited requests sent to test recovery. Success closes circuit. Failure reopens circuit.