Add circuit breaker for external store adapters (v1.6.0)#61
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- `SafeMemoize::Stores::CircuitBreaker` — Stores::Base wrapper with three-state circuit breaker (closed/open/half_open); reads return MISS and writes are no-ops when open, falling back to the per-instance hash - `circuit_breaker:` option on `memoize` auto-wraps the configured store; accepts `true` (defaults: error_threshold 5, probe_interval 30 s) or a Hash with custom values; raises if no store is configured - Does not double-wrap a store already wrapped in CircuitBreaker - Successful calls in closed state reset the consecutive error counter - `circuit_breaker:` accepted by `safe_memoize_options` as a class default - 32 new tests covering state transitions, fallback behavior, introspection, validation, and the memoize option Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Update CHANGELOG, ROADMAP, and README for Stores::CircuitBreaker and the circuit_breaker: memoize option. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
SafeMemoize::Stores::CircuitBreaker— aStores::Basewrapper that protects any external store adapter with a three-state circuit breaker. When the store raises, reads returnMISS(triggering the per-instance fallback cache) and writes are no-ops, so callers never see exceptions.circuit_breaker:option onmemoize— auto-wraps the configuredstore:adapter; acceptstruefor defaults (error_threshold: 5,probe_interval: 30 s) or a Hash to customise; also accepted bysafe_memoize_optionsas a class-wide default.CircuitBreaker; raisesArgumentErrorif no store is configured.States:
:closed(normal, errors counted) →:open(store bypassed until probe interval elapses) →:half_open(probe: success closes circuit, failure re-opens and resets timer). Any success in:closedresets the consecutive error counter so transient blips don't accumulate.Test plan
bundle exec rake— 865 examples, 0 failures, lint cleanreset!, validation errors,circuit_breaker:memoize option (true / Hash / invalid), no double-wrapping, end-to-end fallback to per-instance cache🤖 Generated with Claude Code