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.net core named httpclient, throttle rate, semaphore, semaphoreslim, task, async, asynchronous,
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| public class ThrottledHttpClient : IThrottledHttpClient | |
| { | |
| private readonly HttpClient _httpClient; | |
| private readonly string _baseUrl = @"http://localhost:5000/api"; | |
| public ThrottledHttpClient(HttpClient httpClient) | |
| { | |
| _httpClient = httpClient; | |
| } | |
| public async Task<PrimeNumberResult[]> GetPrimeNumberResults( | |
| List<long> numbers, | |
| int requestLimit = 2, | |
| int limitingPeriodInSeconds = 1) | |
| { | |
| var throttler = new SemaphoreSlim(requestLimit); | |
| var tasks = numbers.Select(async n => | |
| { | |
| await throttler.WaitAsync(); | |
| var task = _httpClient.GetStringAsync($"{_baseUrl}/values/isPrime?number={n}"); | |
| _ = task.ContinueWith(async s => | |
| { | |
| await Task.Delay(1000 * limitingPeriodInSeconds); | |
| Console.WriteLine($"\t\t {n} waiting"); | |
| throttler.Release(); | |
| }); | |
| try | |
| { | |
| var isPrime = await task; | |
| Console.WriteLine($"{n}"); | |
| return new PrimeNumberResult(n, isPrime); | |
| } | |
| catch (HttpRequestException) | |
| { | |
| Console.WriteLine($"\t\t\t {n} error out"); | |
| return new PrimeNumberResult(n, "NA"); | |
| } | |
| }); | |
| return await Task.WhenAll(tasks); | |
| } | |
| } |
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