open fun <T : Any> executeCommandWithFallback(command: Handler<Future<T>>, fallback: Function<Throwable, T>, handler: Handler<AsyncResult<T>>): Unit
Same as io.vertx.rxjava.circuitbreaker.CircuitBreaker#executeWithFallback but using a callback.
handler - the completion handler receiving either the operation result or the fallback result. The parameter is an because if the fallback is not called, the error is passed to the handler.