Simple Ruby implementation of the Circuit Breaker design pattern.
This implementation aims to be as simple as possible. It does not have external dependencies and only handles the core circuit breaker functionality. Wrapping backend calls in timeouts and other exception handling is left to the user of the library.
failure_threshold = 3 # Trip the circuit after 3 consecutive failures. retry_timeout = 10 # Retry on an open circuit after 10 seconds. circuit_breaker = SimpleCircuitBreaker.new(failure_threshold, retry_timeout) # By default, all exceptions will trip the circuit. circuit_breaker.handle do FooClient.new.request end # Setting explicit exceptions that trip the circuit: circuit_breaker.handle FooError, BarError do FooClient.new.request end
SimpleCircuitBreaker#handle raises a
when the circuit is open. Otherwise, it re-raises any exceptions that occur in
gem install simple_circuit_breaker
Run the tests with
- Circuit Breaker: heavily customizable circuit handler
- CircuitB: supports keeping global circuit state in memcached
Pull requests welcome!