保证action方法成功执行一次

RetryUntilTrue.cs

/// <summary>
/// 保证action方法成功执行一次
/// </summary>
/// <param name="action"></param>
/// <param name="timeOut">在指定时间内执行</param>
/// <exception cref="TimeoutException">在指定时间内未能成功执行完，则抛出异常</exception>
public static void RetryUntilTrue(Func<bool> action, TimeSpan? timeOut = null)
{
    var num = 0;
    var now = DateTime.Now;
    while (!timeOut.HasValue || DateTime.Now - now < timeOut.Value)
    {
        num++;
        if (action())
        {
            return;
        }
        SleepBackOffMultiplier(num);
    }
    throw new TimeoutException($"Exceeded timeout of {timeOut.Value}");
}

/// <summary>
/// 阻塞此方法调用体，阻塞随机毫秒数（i的2次方至i+1的2次方区间）
/// </summary>
/// <param name="i"></param>
private static void SleepBackOffMultiplier(int i)
{
    var random = new Random(Guid.NewGuid().GetHashCode());
    var millisecondsTimeout = random.Next((int)Math.Pow(i, 2.0), (int)Math.Pow(i + 1, 2.0) + 1);
    Thread.Sleep(millisecondsTimeout);
}