static IEnumerator <int> ListenerFiber(AsyncEnumerator ae)
{
var listeningServer = new TcpListener(IPAddress.Loopback, 9998);
listeningServer.Start();
while (!ae.IsCanceled())
{
listeningServer.BeginAcceptTcpClient(ae.End(0, listeningServer.EndAcceptTcpClient), null);
yield return(1);
if (ae.IsCanceled())
{
yield break;
}
var clientSocket = listeningServer.EndAcceptTcpClient(ae.DequeueAsyncResult());
var clientAe = new AsyncEnumerator()
{
SyncContext = null
};
clientAe.BeginExecute(
ClientFiber(clientAe, clientSocket),
ar =>
{
try
{
clientAe.EndExecute(ar);
}
catch { }
}, null);
}
}
private IEnumerator <int> ProcessUpdateLookups(AsyncEnumerator asyncEnumerator, QuotePage[] pages)
{
QuotePage page;
for (int i = 0; i < pages.Length; i++)
{
page = pages[i];
LookupResolver.BeginNormalizeTopicOmitChecks(page.Topic, page.Culture,
asyncEnumerator.End(AsyncEnumeratorDiscardGroup, LookupResolver.EndNormalizeTopic), page);
}
IAsyncResult result;
bool updateQuotes = false;
for (int i = 0; i < pages.Length; i++)
{
yield return(1);
if (asyncEnumerator.IsCanceled())
{
yield break;
}
result = asyncEnumerator.DequeueAsyncResult();
page = result.AsyncState as QuotePage;
try
{
page.Topic = LookupResolver.EndNormalizeTopic(result);
page.Uri = LookupResolver.GetUri(page.Topic, page.Culture);
}
catch
{
OnTopicNotFound(new TopicNotFoundEventArgs(page.Topic, page.Culture));
yield break;
}
lock (_lookupsInProgress)
{
if (!_lookupsInProgress.Contains(page.Uri))
{
_lookupsInProgress.Add(page.Uri);
updateQuotes = true;
}
}
if (updateQuotes)
{
QuoteCollector.UpdateQuotesAsync(page);
}
}
lock (_asyncEnumerators)
{
_asyncEnumerators.Remove(asyncEnumerator);
}
}
private IEnumerator <int> ProcessLookup(AsyncEnumerator asyncEnumerator, string topic, CultureInfo culture)
{
LookupResolver.BeginNormalizeTopicOmitChecks(topic, culture,
asyncEnumerator.End(AsyncEnumeratorDiscardGroup, LookupResolver.EndNormalizeTopic), null);
yield return(1);
if (asyncEnumerator.IsCanceled())
{
yield break;
}
try
{
topic = LookupResolver.EndNormalizeTopic(asyncEnumerator.DequeueAsyncResult());
}
catch
{
OnTopicNotFound(new TopicNotFoundEventArgs(topic, culture));
yield break;
}
Uri uri = LookupResolver.GetUri(topic, culture);
bool collectQuotes = false;
lock (_playlist)
{
if (_playlist.Contains(uri))
{
OnTopicAlreadyExists(new TopicAlreadyExistsEventArgs(topic, culture));
yield break;
}
}
lock (_lookupsInProgress)
{
if (!_lookupsInProgress.Contains(uri))
{
_lookupsInProgress.Add(uri);
collectQuotes = true;
}
}
if (collectQuotes)
{
QuoteCollector.CollectQuotesAsync(topic, culture, uri);
}
lock (_asyncEnumerators)
{
_asyncEnumerators.Remove(asyncEnumerator);
}
}
private IEnumerator<Int32> GetImages(AsyncEnumerator ae)
{
ae.ThrowOnMissingDiscardGroup(true);
// Request all the images asynchronously
WebRequest[] requests = new WebRequest[]
{
WebRequest.Create(_imageUris[0]),
WebRequest.Create(m_chkSimFailure.Checked ? _imageUris[2] : _imageUris[1])
};
for(Int32 n = 0; n < requests.Length; n++)
requests[n].BeginGetResponse(
ae.EndVoid(0, asyncResult => { requests[(Int32) asyncResult.AsyncState].EndGetResponse(asyncResult).Close(); }), n);
// Set timeout if specified.
Int32 timeout;
if(Int32.TryParse(m_txtServerTime.Text, out timeout))
ae.SetCancelTimeout(timeout, null);
// WaitAsync for all operations to complete (or timeout)
yield return requests.Length;
if(ae.IsCanceled())
{
m_lblPic1.Text = "Server couldn't process the request in the specified time.";
yield break;
}
for(Int32 n = 0; n < requests.Length; n++)
{
IAsyncResult result = ae.DequeueAsyncResult();
Int32 reqNum = (Int32) result.AsyncState;
Label lbl = (reqNum == 0) ? m_lblPic1 : m_lblPic2;
WebRequest request = requests[reqNum];
WebResponse response = null;
try
{
response = request.EndGetResponse(result);
lbl.Text = String.Format("Image at {0} is {1:N0} bytes",
response.ResponseUri, response.ContentLength);
}
catch(WebException e)
{
lbl.Text = String.Format("Error obtaining image at {0}: {1}",
request.RequestUri, e.Message);
}
finally
{
if(response != null) response.Close();
}
}
}
private IEnumerator <Int32> GetImages(AsyncEnumerator ae)
{
ae.ThrowOnMissingDiscardGroup(true);
// Request all the images asynchronously
WebRequest[] requests = new WebRequest[]
{
WebRequest.Create(_imageUris[0]),
WebRequest.Create(m_chkSimFailure.Checked ? _imageUris[2] : _imageUris[1])
};
for (Int32 n = 0; n < requests.Length; n++)
{
requests[n].BeginGetResponse(
ae.EndVoid(0, asyncResult => { requests[(Int32)asyncResult.AsyncState].EndGetResponse(asyncResult).Close(); }), n);
}
// Set timeout if specified.
Int32 timeout;
if (Int32.TryParse(m_txtServerTime.Text, out timeout))
{
ae.SetCancelTimeout(timeout, null);
}
// WaitAsync for all operations to complete (or timeout)
yield return(requests.Length);
if (ae.IsCanceled())
{
m_lblPic1.Text = "Server couldn't process the request in the specified time.";
yield break;
}
for (Int32 n = 0; n < requests.Length; n++)
{
IAsyncResult result = ae.DequeueAsyncResult();
Int32 reqNum = (Int32)result.AsyncState;
Label lbl = (reqNum == 0) ? m_lblPic1 : m_lblPic2;
WebRequest request = requests[reqNum];
WebResponse response = null;
try
{
response = request.EndGetResponse(result);
lbl.Text = String.Format("Image at {0} is {1:N0} bytes",
response.ResponseUri, response.ContentLength);
}
catch (WebException e)
{
lbl.Text = String.Format("Error obtaining image at {0}: {1}",
request.RequestUri, e.Message);
}
finally
{
if (response != null)
{
response.Close();
}
}
}
}
static IEnumerator <int> ClientFiber(AsyncEnumerator ae, TcpClient clientSocket)
{
Console.WriteLine("ClientFibers ++{0}", Interlocked.Increment(ref clients));
try
{
// original code to do handshaking and connect to remote host
var ns1 = clientSocket.GetStream();
var r1 = new BinaryReader(ns1);
var w1 = new BinaryWriter(ns1);
if (!(r1.ReadByte() == 5 && r1.ReadByte() == 1))
{
yield break;
}
var c = r1.ReadByte();
for (int i = 0; i < c; ++i)
{
r1.ReadByte();
}
w1.Write((byte)5);
w1.Write((byte)0);
if (!(r1.ReadByte() == 5 && r1.ReadByte() == 1))
{
yield break;
}
if (r1.ReadByte() != 0)
{
yield break;
}
byte[] ipAddr = null;
string hostname = null;
var type = r1.ReadByte();
switch (type)
{
case 1:
ipAddr = r1.ReadBytes(4);
break;
case 3:
hostname = Encoding.ASCII.GetString(r1.ReadBytes(r1.ReadByte()));
break;
case 4:
throw new Exception();
}
var nhport = r1.ReadInt16();
var port = IPAddress.NetworkToHostOrder(nhport);
var socketout = new TcpClient();
if (hostname != null)
{
socketout.Connect(hostname, port);
}
else
{
socketout.Connect(new IPAddress(ipAddr), port);
}
w1.Write((byte)5);
w1.Write((byte)0);
w1.Write((byte)0);
w1.Write(type);
switch (type)
{
case 1:
w1.Write(ipAddr);
break;
case 3:
w1.Write((byte)hostname.Length);
w1.Write(Encoding.ASCII.GetBytes(hostname), 0, hostname.Length);
break;
}
w1.Write(nhport);
using (var ns2 = socketout.GetStream())
{
var forwardAe = new AsyncEnumerator()
{
SyncContext = null
};
forwardAe.BeginExecute(
ForwardingFiber(forwardAe, ns1, ns2), ae.EndVoid(0, forwardAe.EndExecute), null);
yield return(1);
if (ae.IsCanceled())
{
yield break;
}
forwardAe.EndExecute(ae.DequeueAsyncResult());
}
}
finally
{
Console.WriteLine("ClientFibers --{0}", Interlocked.Decrement(ref clients));
}
}
static IEnumerator <int> ForwardingFiber(AsyncEnumerator ae, NetworkStream inputStream, NetworkStream outputStream)
{
while (!ae.IsCanceled())
{
byte[] outputRead = new byte[bufsize], outputWrite = new byte[bufsize];
byte[] inputRead = new byte[bufsize], inputWrite = new byte[bufsize];
// start off output and input reads.
// NB ObjectDisposedExceptions can be raised here when a socket is closed while an async read is in progress.
outputStream.BeginRead(outputRead, 0, bufsize, ae.End(1, ar => outputStream.EndRead(ar)), Operation.OutboundRead);
inputStream.BeginRead(inputRead, 0, bufsize, ae.End(1, ar => inputStream.EndRead(ar)), Operation.InboundRead);
var pendingops = 2;
while (!ae.IsCanceled())
{
// wait for the next operation to complete, the state object passed to each async
// call can be used to find out what completed.
if (pendingops == 0)
{
yield break;
}
yield return(1);
if (!ae.IsCanceled())
{
int byteCount;
var latestEvent = ae.DequeueAsyncResult();
var currentOp = (Operation)latestEvent.AsyncState;
if (currentOp == Operation.InboundRead)
{
byteCount = inputStream.EndRead(latestEvent);
if (byteCount == 0)
{
pendingops--;
outputStream.Close();
continue;
}
Array.Copy(inputRead, outputWrite, byteCount);
outputStream.BeginWrite(outputWrite, 0, byteCount, ae.EndVoid(1, outputStream.EndWrite), Operation.OutboundWrite);
inputStream.BeginRead(inputRead, 0, bufsize, ae.End(1, ar => inputStream.EndRead(ar)), Operation.InboundRead);
}
else if (currentOp == Operation.OutboundRead)
{
byteCount = outputStream.EndRead(latestEvent);
if (byteCount == 0)
{
pendingops--;
inputStream.Close();
continue;
}
Array.Copy(outputRead, inputWrite, byteCount);
inputStream.BeginWrite(inputWrite, 0, byteCount, ae.EndVoid(1, inputStream.EndWrite), Operation.InboundWrite);
outputStream.BeginRead(outputRead, 0, bufsize, ae.End(1, ar => outputStream.EndRead(ar)), Operation.OutboundRead);
}
else if (currentOp == Operation.InboundWrite)
{
inputStream.EndWrite(latestEvent);
}
else if (currentOp == Operation.OutboundWrite)
{
outputStream.EndWrite(latestEvent);
}
}
}
}
}
private IEnumerator<Int32> DownloadImages(AsyncEnumerator ae)
{
ae.ThrowOnMissingDiscardGroup(true);
GetImages.IsEnabled = false;
Cancel.IsEnabled = true;
WebRequest[] requests = new WebRequest[] {
WebRequest.Create(UriHelper.ConvertRelativeUriStringToAbsolute("Images/Wintellect.jpg")),
WebRequest.Create(UriHelper.ConvertRelativeUriStringToAbsolute("Images/JeffreyRichter.jpg")),
};
for (Int32 requestNum = 0; requestNum < requests.Length; requestNum++) {
requests[requestNum].BeginGetResponse(
ae.EndVoid(0, asyncResult => {
requests[requestNum].EndGetResponse(asyncResult).Close();
}), requestNum);
}
for (Int32 resultNum = 0; resultNum < requests.Length; resultNum++) {
yield return 1;
if (ae.IsCanceled()) break;
IAsyncResult asyncResult = ae.DequeueAsyncResult();
Int32 index = (Int32)asyncResult.AsyncState;
try {
using (WebResponse response = requests[index].EndGetResponse(asyncResult)) {
using (Stream stream = response.GetResponseStream()) {
BitmapImage bitmapImage = new BitmapImage();
bitmapImage.SetSource(stream);
m_images[index].Source = bitmapImage;
}
}
}
catch (WebException e) {
m_textboxes[index].Text = "Failed: " + e.Message;
}
}
GetImages.IsEnabled = true;
Cancel.IsEnabled = false;
}
// Because SyncContext is set, all the iterator code runs on the GUI thread
private IEnumerator<Int32> GetWebData(AsyncEnumerator ae, String[] uris)
{
ToggleStartAndCancelButtonState(false);
m_lbResults.Items.Clear();
// Auto-cancel after 5 seconds if the user desires
if (m_chkAutoCancel.Checked)
ae.SetCancelTimeout(5000, ae);
// Issue several web requests (all in discard group 0) simultaneously
foreach (String uri in uris) {
WebRequest webRequest = WebRequest.Create(uri);
// If the AsyncEnumerator is canceled, DiscardWebRequest cleans-up
// any outstanding operations as they complete in the future
webRequest.BeginGetResponse(ae.EndVoid(0, DiscardWebRequest), webRequest);
}
yield return uris.Length; // Process the completed web requests after all complete
String resultStatus; // Ultimate result of processing shown to user
// Check if iterator was canceled
Object cancelValue;
if (ae.IsCanceled(out cancelValue)) {
// Tell the AE to auto-cleanup any operations issued as part of discard group 0
ae.DiscardGroup(0);
// Note: In this example calling DiscardGroup above is not mandatory
// because the whole iterator is stopping execution; causing all
// discard groups to be discarded automatically.
resultStatus = (cancelValue == ae) ? "Timeout" : "User canceled";
goto Complete;
}
// Iterator wasn't canceled, process all the completed operations
for (Int32 n = 0; n < uris.Length; n++) {
// Grab the result of a completed web request
IAsyncResult result = ae.DequeueAsyncResult();
// Get the WebRequest object used to initate the request
// (see BeginGetResponse's last argument above)
WebRequest webRequest = (WebRequest)result.AsyncState;
// Build the String showing the result of this completed web request
String s = "URI=" + webRequest.RequestUri + ", ";
try {
using (WebResponse webResponse = webRequest.EndGetResponse(result)) {
s += "ContentLength=" + webResponse.ContentLength;
}
}
catch (WebException e) {
s += "Error=" + e.Message;
}
m_lbResults.Items.Add(s); // Add result of operation to listbox
}
resultStatus = "All operations completed.";
Complete:
// All operations have completed or cancelation occurred, tell user
MessageBox.Show(this, resultStatus);
// Reset everything so that the user can start over if they desire
m_ae = null; // Reset since we're done
ToggleStartAndCancelButtonState(true);
}
private IEnumerator <int> ProcessCollectQuotes(AsyncEnumerator asyncEnumerator, string topic, CultureInfo culture, Uri uri, AssignQuotePageDataDelegate assignQuotesDelegate)
{
Uri quoteSourceUri = GetQuoteSourceUri(culture, topic);
Util.BeginFetchXmlPage(quoteSourceUri, asyncEnumerator.End(AsyncEnumeratorDiscardGroup, Util.EndFetchXmlPage), null);
yield return(1);
if (asyncEnumerator.IsCanceled())
{
yield break;
}
string contents;
try
{
XDocument xDocument = Util.EndFetchXmlPage(asyncEnumerator.DequeueAsyncResult());
if (xDocument == null)
{
throw new NullReferenceException();
}
// extracting the page contents
contents = GetXmlPageContents(xDocument);
}
catch (Exception ex)
{
OnErrorCollectingQuotes(new ErrorCollectingQuotesEventArgs(topic, culture, uri, ex));
yield break;
}
IAsyncResult getQuotesResult = BeginParsePageContentsAndExtractQuotes(topic, culture, contents, null,
asyncEnumerator.End(AsyncEnumeratorDiscardGroup, EndParsePageContentsAndExtractQuotes), null);
IAsyncResult getTopicTranslationsResult = BeginExtractTopicTranslations(contents,
asyncEnumerator.End(AsyncEnumeratorDiscardGroup, EndExtractTopicTranslations), null);
yield return(2);
if (asyncEnumerator.IsCanceled())
{
yield break;
}
try
{
TopicTranslation[] topicTranslations = EndExtractTopicTranslations(getTopicTranslationsResult);
SelectableQuoteCollection quotes = EndParsePageContentsAndExtractQuotes(getQuotesResult);
if (quotes.Count == 0)
{
OnNoQuotesCollected(new NoQuotesCollectedEventArgs(topic, culture, uri));
// Change by Ming Slogar on 26Apr2014 at 20:25
// Reason: The following line prevents the topic from being returned
// when it has no listed quotes.
//yield break;
}
assignQuotesDelegate.Invoke(quotes, topicTranslations);
}
catch (TopicAmbiguousException ex)
{
OnTopicAmbiguous(new TopicAmbiguousEventArgs(topic, culture, uri, ex.TopicChoices));
yield break;
}
catch (Exception ex)
{
OnErrorCollectingQuotes(new ErrorCollectingQuotesEventArgs(topic, culture, uri, ex));
yield break;
}
finally
{
// cleanup
asyncEnumerator.DequeueAsyncResult();
asyncEnumerator.DequeueAsyncResult();
lock (asyncEnumerator)
{
_asyncEnumerators.Remove(asyncEnumerator);
}
}
}
