question: public CircuitBreakerBuilder circuitOpenWindow ( Duration circuitOpenWindow ) { requireNonNull ( circuitOpenWindow , "circuitOpenWindow" ) ; if ( circuitOpenWindow . isNegative ( ) || circuitOpenWindow . isZero ( ) ) { throw new IllegalArgumentException ( "circuitOpenWindow: " + circuitOpenWindow + " (expected: > 0)" ) ; } this . circuitOpenWindow = circuitOpenWindow ; return this ; }
target:  Sets the duration of OPEN state.