When the circuit is “open,” calls to the circuit breaker fail immediately, without any attempt to execute the real operation. After a suitable amount of time, the circuit breaker decides that the operation has a chance of succeeding, so it goes into the “half-open” state. In this state, the next call to the circuit breaker is allowed to execute the dangerous operation. Should the call succeed, the circuit breaker resets and returns to the “closed” state, ready for more routine operation. If this trial call fails, however, the circuit breaker returns to the open state until another timeout
...more
