The document discusses asynchronous programming and different approaches to handling asynchronous operations. It covers asynchronous programming concepts like asynchronous functions, asynchronous callbacks, and asynchronous events. It then describes different asynchronous programming models including synchronous, asynchronous programming model (APM), event-based asynchronous pattern (EAP), task-based asynchronous pattern (TAP), and async/await. Code examples are provided to illustrate each approach.

1. 동기의 시대를 뛰어넘는

3. 응용 프로그램이
나쁜 평가를 받는 이유
사용자들은 대체적으로
성능과 연관 지어
응용 프로그램의
품질을 평가

11. 개념
다른 측(다른 스레드/디바이스 드라이버)이 작업 수행
작업을 요청한 스레드와 작업을 수행하는 측이 동일하지 않다
비동기 함수 호출
작업요청 방식이 다르다
작업이 완료될 때까지 대기하지 않겠다
작업 완료 통지
작업이 완료되면 알려다오

12. 작업 요청 스레드 작업 수행 스레드 혹은 Device Driver

13. 작업 요청 스레드 작업 수행 스레드 혹은 Device Driver

14. 작업 요청 스레드 작업 수행 스레드 혹은 Device Driver

15. 작업 요청 스레드 작업 수행 스레드 혹은 Device Driver

16. 비동기 프로그래밍
사용자의 조작에 빠르게 응답
CPU 작업을 효율적으로 수행
I/O 작업을 효율적으로 수행

20. public class MyClass
{
public int Read(byte [] buffer, int offset, int count);
}
public class MyClass
{
public IAsyncResult BeginRead(
byte [] buffer, int offset, int count,
AsyncCallback callback, object state);
public int EndRead(IAsyncResult asyncResult);
}
public class MyClass
{
public void ReadAsync(byte [] buffer, int offset, int count);
public event ReadCompletedEventHandler ReadCompleted;
}
public class MyClass
{
public Task<int> ReadAsync(byte [] buffer, int offset, int count);
}
1. Sync
2. APM
3. EAP
4. TAP

21. private void Button_Click(object sender, RoutedEventArgs e)
{
string url = "http://windowsteamblog.com/windows/b/windowsexperience/atom.aspx";
WebClient client = new WebClient();
client.DownloadStringCompleted += client_DownloadStringCompleted;
client.DownloadStringAsync(new Uri(url)); // 수행해야할 작업을 전달
// 다른 일을 할 수도 있다
}
// 작업이 완료되면 이벤트를 발생시켜 통보
void client_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs arg)
{
Debug.WriteLine(arg.Result);
}

22. private void Button_Click(object sender, RoutedEventArgs e)
{
string url = "http://windowsteamblog.com/windows/b/windowsexperience/atom.aspx";
WebClient client = new WebClient();
client.DownloadStringCompleted += (s, arg) => Debug.WriteLine(arg.Result);
client.DownloadStringAsync(new Uri(url));
}

23. private void Button_Click(object sender, RoutedEventArgs e)
{
Task.Run(() => WorkAsync());
}
private void WorkAsync()
{
string url = "http://windowsteamblog.com/windows/b/windowsexperience/atom.aspx";
WebClient client = new WebClient();
Task<string> t = client.DownloadStringTaskAsync(new Uri(url));
t.Wait(); // 작업이 완료되때까지 대기
Debug.WriteLine(t.Result);
}

24. private void Button_Click(object sender, RoutedEventArgs e)
{
Task.Run(() => WorkAsync());
}
private void WorkAsync()
{
string url = "http://windowsteamblog.com/windows/b/windowsexperience/atom.aspx";
WebClient client = new WebClient();
Task<string> t = client.DownloadStringTaskAsync(new Uri(url));
t.ContinueWith((prevTask) => Debug.WriteLine(prevTask.Result));
}

25. async Task<int> FuncAsync()
{
int r = await DoAsync();
return r;
}
• TAP과 함께
• APM/EAPTAP로 변환
• 비동기 함수의 이름은
XxxAsync()/XxxTaskAsync()
• await 와 async는 함께
• 반환형은
Task, Task<TResult>

26. private async void Button_Click(object sender, RoutedEventArgs e)
{
await WorkAsync();
}
private async Task WorkAsync()
{
string url = "http://windowsteamblog.com/windows/b/windowsexperience/atom.aspx";
WebClient client = new WebClient();
string result = await client.DownloadStringTaskAsync(new Uri(url));
Debug.WriteLine(result);
}

27. Click
async Task LoadSettingsAsync() {
await IO.Network.DownloadAsync(path);
}
async void Button1_Click(){
await LoadSettingsAsync();
UpdateView();
}
Click
Messagepump
Task ...
DownloadAsync
Task ...
LoadSettingsAsync
Download
LoadSettings

28. private void Button_Click(object sender, RoutedEventArgs e)
{
string url = "http://windowsteamblog.com/windows/b/windowsexperience/atom.aspx";
WebClient client = new WebClient();
Task<string> t = client.DownloadStringTaskAsync(new Uri(url));
t.ContinueWith((r) => Debug.WriteLine(r.Result));
}
private async void Button_Click_1(object sender, RoutedEventArgs e)
{
string url = "http://windowsteamblog.com/windows/b/windowsexperience/atom.aspx";
WebClient client = new WebClient();
string result = await client.DownloadStringTaskAsync(new Uri(url));
Debug.WriteLine(result);
}
TAP with async/await
TAP

29. TAP
EAP
TAP, ContinueWith
async/await

30. WinRT의 비동기
C++는 PPL
C#, VB는 TPL과 async/await
Javascript는 commonJS/A 의 promise/then

31. + +

32. Windows Runtime

33. public sealed class SyndicationClient : ISyndicationClient
{
public IAsyncOperationWithProgress<SyndicationFeed, RetrievalProgress>
RetrieveFeedAsync(Uri uri);
…
}
public sealed class SyndicationFeed : ISyndicationNode
{
public ISyndicationText Title { get; set; }
…
}
public interface ISyndicationText : ISyndicationNode
{
string Text { get; set; }
…
}

34. #include <ppltasks.h>
void App::SetFeedText() {
using namespace Windows::Web::Syndication;
using namespace concurrency;
String^ url = "http://windowsteamblog.com/windows_phone/b/wmdev/atom.aspx";
SyndicationClient^ client = ref new SyndicationClient();
task<SyndicationFeed^> retriveTask(client->RetrieveFeedAsync(ref new Uri(url)));
retriveTask.then([this] (SyndicationFeed^ feed)
{
String ^title = feed->Title->Text;
});
}

35. function SetFeedText()
{
var url = "http://windowsteamblog.com/windows/b/windowsexperience/atom.aspx";
var client = Windows.Web.Syndication.SyndicationClient();
var feedOp = client.retrieveFeedAsync(new Windows.Foundation.Uri(url));
feedOp.then(function (feed)
{
var title = feed.title.text;
});
}

36. private async void SetFeedText()
{
string url = "http://windowsteamblog.com/windows/b/windowsexperience/atom.aspx";
SyndicationClient client = new SyndicationClient();
SyndicationFeed feed = await client.RetrieveFeedAsync(new Uri(url));
var title = feed.Title.Text;
}

37. async/await
Use raw interface
Multiple task
Task Combination