Closed state

This is the initial state of the circuit, which depicts a normal flow of control. In this state, there is a failure counter. If OperationFailedException occurs in this flow, the failure counter is increased by 1. If the failure counter keeps increasing, meaning the circuit encounters more exception, and reaches the failure threshold set, the circuit breaker transitions to an Open state. But if the calls succeed without any exception or failure, the failure count is reset.