HttpClient-介绍尝试次数 [英] HttpClient - introducing number of tries

问题描述

大家好，

我编写了以下代码(将从旧版应用程序以及.NET dll中调用该代码):

I've written the following code (which is going to be called from the legacy application as well as from .NET dll):

/// <param name="tnTimeout">The number of seconds to wait for the HTTP POST call to complete and return a response</param>
        /// <param name="tnRetries">If no respone in the timeout period, the number of times to attempt contact the host. 
        ///                         If it was a DNS lookup failure or other glaring connection issue, then retries can be bypassed..</param>
        /// <param name="tnReturnValue">Passed by reference, it is the "ReturnValue" string in the JSON response</param>
        /// <param name="tcReturnValueText">Passed by reference, it is the "ReturnValueText" string in the JSON response</param>
        /// <param name="tcMessage">"Message" string in the JSON response, if present</param>
        /// <param name="tcProductCode">"ExternalProductCode" string in the JSON response, if present</param>
        /// <returns>int Status</returns> 
        /// </summary>
        public int CheckPass(String tcHost, String tcUserName, String tcPassword, String tcBarcode,
                      String tcUsageDate, Int32 tnTimeout, Int32 tnRetries,
                      ref Int32 tnReturnValue, ref String tcReturnValueText, ref String tcMessage, ref String tcProductCode)

        {
            Int32 statusCode = 1;
            try
            {
                SetRequestHeaders(tcHost, tcUserName, tcPassword, tnTimeout);

                var json = new specificJSON();
                var ticket = new TicketUsageRequest(tcBarcode, tcUsageDate, tcUserName);

                json.TicketUsageRequests.Add(ticket);

                Task<TicketUsageResponse> task = GetResponse(json, "path here");
                

                TicketUsageResponse result = task.Result;

                tcMessage = result.ReturnData[0].Message;
                tcReturnValueText = result.ReturnValueText;
                tnReturnValue = result.ReturnValue;
                tcProductCode = result.ReturnData[0].ExternalProductCode;
            }

            catch (Exception e)
            {
                tcReturnValueText = e.Message;
                statusCode = 0;
            }

            return statusCode;
        }


        async Task<TicketUsageResponse> GetResponse(specificJSON json, String url)
        {
            TicketUsageResponse ticketUsageResponse = null;
            using (HttpResponseMessage response = await client.PostAsJsonAsync(url, json))
            {
                if (response.IsSuccessStatusCode)
                {
                    using (HttpContent content = response.Content)
                    {
                        ticketUsageResponse = await content.ReadAsAsync<TicketUsageResponse>();
                    }
                }
                else
                {
                    Int32 statusCode = (Int32) response.StatusCode;
                    throw new HttpException(statusCode, response.ReasonPhrase);
                } 
                
            }
            return ticketUsageResponse;
        }

我想以某种方式将尝试次数引入此代码中(请参阅tnTries参数).我们应该检查是否存在超时，如果超时，请重试.

I want to somehow introduce number of tries into this code (see tnTries parameter). We should check if there is a timeout and if so, re-try.

我也找到了此讨论内容， http://stackoverflow .com/questions/10547895/how-can-i-tell-when-httpclient-has-timed-out  但我不确定 如何将其合并到我的代码中.

I also found this discussion http://stackoverflow.com/questions/10547895/how-can-i-tell-when-httpclient-has-timed-out but I am not exactly sure how to incorporate it into my code.

我也很欣赏有关该代码的建设性评论-我该如何改进它.

And I also appreciate a constructive comments about that code - how can I improve it.

谢谢.

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推荐答案

Naomy.

在我的一个项目中，我使用了Polly来管理重拨和紧急呼叫的相关延迟.

Within a project of mine I used Polly to manage retry and related delay for my critical calls.

https://github.com/App-vNext/Polly

https://github.com/App-vNext/Polly

这篇关于HttpClient-介绍尝试次数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！