Service warm-up client using Async-Await

Service warm-up client using Async-Await

1.      Create an async method with HttpClient. (For example, HttpGet & HttpPost)

public async Task<HttpStatusCode> Get(String apiUrl) { HttpClient httpClient = this.CreateHttpClient(apiUrl); try { //GetAsync HttpResponseMessage resp = httpClient.GetAsync(apiUrl).Result; //Throw an Exception when getting an error Status Code //resp.EnsureSuccessStatusCode(); return resp.StatusCode; } catch (Exception ex){ return HttpStatusCode.NotFound; } finally{  httpClient.Dispose();} }

public async Task<HttpStatusCode> Post(String apiUrl) { HttpClient httpClient = this.CreateHttpClient(apiUrl); try { //Create JSon IcashMsg icashMsg = new IcashMsg(); //PostAsJsonAsync HttpResponseMessage resp = httpClient.PostAsJsonAsync(apiUrl, icashMsg).Result; //Throw an Exception when getting an error Status Code //resp.EnsureSuccessStatusCode(); return resp.StatusCode; } catch (Exception ex){ return HttpStatusCode.NotFound; } finally{  httpClient.Dispose();} }

2.      The async sub-method await the HttpGet/HttpPost method above, and then do the logical codes.

public async void ChkWebapi(ConnInfo connInfo) { using (WebApiConn wsConn = new WebApiConn()) { // Response HttpStatusCode HttpStatusCode peekStsCode = new HttpStatusCode(); peekStsCode = await wsConn.Get(connInfo.IP); // peekStsCode = await wsConn.Post(connInfo.IP); // logical/other codes here } }

3.      Since we finished the async-await method, we can use some concurrent codes to test it.

//Get Urls List<icasH.ApConsole.ApLib.ConnInfo> connInfoList4Get = … ; Parallel.ForEach(connInfoList4Get, conn => { using (Conn Conns = new Conn()) { Conns.ChkWebapi(conn); } });

Result :

4.      Reference
Best Practices in Asynchronous Programming