1. 概要

實(shí)驗(yàn)服務(wù)保護(hù)，自動(dòng)重新連接功能。

2.代碼

2.1 重復(fù)工具?

using Polly;
using Polly.Retry;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Threading.Tasks;

namespace WebApplication2
{
    public class ClientPolicy
    {
        public AsyncRetryPolicy<HttpResponseMessage> asyncRetryPolicy { get; set; } 
        public ClientPolicy()
        {
            asyncRetryPolicy = Policy.HandleResult<HttpResponseMessage>(p=>!p.IsSuccessStatusCode).WaitAndRetryAsync(5,retryAttemp=>TimeSpan.FromSeconds(Math.Pow(2,retryAttemp)));
        }
    }
}

2.2 調(diào)用位置

using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Threading.Tasks;

namespace WebApplication2.Controllers
{
    [ApiController]
    [Route("[controller]")]
    public class WeatherForecastController : ControllerBase
    {
        private static readonly string[] Summaries = new[]
        {
            "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
        };

        private readonly ILogger<WeatherForecastController> _logger;

        public WeatherForecastController(ILogger<WeatherForecastController> logger)
        {
            _logger = logger;
        }

        [HttpGet]
        public IEnumerable<WeatherForecast> Get()
        {
            var rng = new Random();
            ClientPolicy clientPolicy = new ClientPolicy();
            HttpClient httpClient = new HttpClient();
            clientPolicy.asyncRetryPolicy.ExecuteAsync(() => httpClient.GetAsync($"https://localhost:44367/test"));


            return Enumerable.Range(1, 5).Select(index => new WeatherForecast
            {
                Date = DateTime.Now.AddDays(index),
                TemperatureC = rng.Next(-20, 55),
                Summary = Summaries[rng.Next(Summaries.Length)]
            })
            .ToArray();
        }

        [HttpGet("/test")]
        public IActionResult test()
        {
            var randomNumber = new Random().Next(1, 100);
            if(randomNumber > 20)
            {
                //Console.WriteLine("請(qǐng)求成功 200");
                //return Ok("請(qǐng)求成功");
            }
            Console.WriteLine("請(qǐng)求失敗");
            return BadRequest("請(qǐng)求失敗");
        }
    }
}

2.實(shí)驗(yàn)結(jié)果

如果失敗下面的函數(shù)會(huì)重復(fù)調(diào)用5次文章來(lái)源地址http://www.zghlxwxcb.cn/news/detail-833528.html

[HttpGet("/test")]
        public IActionResult test()
        {
            var randomNumber = new Random().Next(1, 100);
            if(randomNumber > 20)
            {
                //Console.WriteLine("請(qǐng)求成功 200");
                //return Ok("請(qǐng)求成功");
            }
            Console.WriteLine("請(qǐng)求失敗");
            return BadRequest("請(qǐng)求失敗");
        }

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