我有一个流程,需要向服务器发出约100个http api调用并处理结果。我编写了这个commandexecutor,它构建了一系列命令,然后异步运行它们。进行大约100次调用和解析结果需要超过1分钟的时间。使用浏览器进行1次请求可以在约100毫秒内获得响应。你可能认为100次调用大约需要10秒钟。我相信我做错了什么,这应该能更快。
public static class CommandExecutor
{
private static readonly ThreadLocal<List<Command>> CommandsToExecute =
new ThreadLocal<List<Command>>(() => new List<Command>());
private static readonly ThreadLocal<List<Task<List<Candidate>>>> Tasks =
new ThreadLocal<List<Task<List<Candidate>>>>(() => new List<Task<List<Candidate>>>());
public static void ExecuteLater(Command command)
{
CommandsToExecute.Value.Add(command);
}
public static void StartExecuting()
{
foreach (var command in CommandsToExecute.Value)
{
Tasks.Value.Add(Task.Factory.StartNew<List<Candidate>>(command.GetResult));
}
Task.WaitAll(Tasks.Value.ToArray());
}
public static List<Candidate> Result()
{
return Tasks.Value.Where(x => x.Result != null)
.SelectMany(x => x.Result)
.ToList();
}
}
我正在传递到这个列表中的命令会创建一个新的httpclient,调用该客户端上的getasync方法并传入一个url,将字符串响应转换为对象,然后填充一个字段。
protected void Initialize()
{
_httpClient = new HttpClient();
_httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("text/plain"));
}
protected override void Execute()
{
Initialize();
var task = _httpClient.GetAsync(string.Format(Url, Input));
Result = ConvertResponseToObjectAsync(task).Result;
Result.ForEach(x => x.prop = value);
}
private static Task<Model> ConvertResponseToObjectAsync(Task<HttpResponseMessage> task)
{
return task.Result.Content.ReadAsAsync<Model>(
new MediaTypeFormatter[]
{
new Formatter()
});
}
您能发现我的瓶颈并提出如何加速的建议吗?
编辑:进行这些更改后,时间缩短到了4秒。
protected override void Execute()
{
Initialize();
_httpClient.GetAsync(string.Format(Url, Input))
.ContinueWith(httpResponse => ConvertResponseToObjectAsync(httpResponse)
.ContinueWith(ProcessResult));
}
protected void ProcessResult(Task<Model> model)
{
Result = model.Result;
Result.ForEach(x => x.prop = value);
}