如何在Mono.retry中实现变量回退？

import reactor.core.publisher.Mono;
import reactor.util.retry.Retry;
import reactor.util.retry.RetryBackoffSpec;

public class RetryExample {
    public static void main(String[] args) {
        // 创建一个Mono对象
        Mono<String> mono = Mono.error(new RuntimeException("Oops!"));

        // 定义重试策略
        RetryBackoffSpec retrySpec = Retry.backoff(3, java.time.Duration.ofMillis(100))
                .maxBackoff(java.time.Duration.ofSeconds(5))
                .jitter(0.5);

        // 在Mono上应用重试策略
        Mono<String> retryMono = mono.retryWhen(retrySpec);

        // 订阅并处理结果
        retryMono.subscribe(
                result -> System.out.println("Success: " + result),
                error -> System.out.println("Error: " + error.getMessage())
        );
    }
}