public Yield thumb(DreamContext context, DreamMessage request, Result<DreamMessage> response) {
var slide = context.GetParam<int>("slide");
var width = context.GetParam<int>("width");
var height = context.GetParam<int>("height");
var requestInfo = new RequestInfo {
slide=slide,
width=width,
height=height
};
var image = cache.ContainsKey(requestInfo) ?
cache[requestInfo] : createImage(requestInfo);
response.Return(DreamMessage.Ok(MimeType.JPEG, image));
yield break;
}
private byte[] createImage(RequestInfo info){
byte[] result = new byte[0];
var synchrony = new Thread(new ParameterizedThreadStart(delegate{
List<PreParser> parserList = new List<PreParser>();
MeTLLib.MeTLLibEventHandlers.PreParserAvailableEventHandler parserReceiver = (sender, parserAvailableArgs)=>{
parserList.Add(parserAvailableArgs.parser);
};
client.events.PreParserAvailable += parserReceiver;
var staThread = new Thread(new ParameterizedThreadStart(delegate{
while (parserList.Count() < 3)
{ }
var canvas = new InkCanvas();
foreach (var preParser in parserList.ToList())
preParser.Populate(canvas);
var viewBox = new Viewbox();
viewBox.Stretch = Stretch.Uniform;
viewBox.Child = canvas;
viewBox.Width = info.width;
viewBox.Height = info.height;
var size = new Size(info.width, info.height);
viewBox.Measure(size);
viewBox.Arrange(new Rect(size));
viewBox.UpdateLayout();
viewBox.Dispatcher.Invoke(DispatcherPriority.Background,new ThreadStart(delegate { }));
RenderTargetBitmap targetBitmap =
new RenderTargetBitmap(info.width, info.height, 96d, 96d, PixelFormats.Pbgra32);
targetBitmap.Render(viewBox);
PngBitmapEncoder encoder = new PngBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(targetBitmap));
using (var stream = new MemoryStream())
{
encoder.Save(stream);
result = stream.ToArray();
}
client.events.PreParserAvailable -= parserReceiver;
}));
staThread.SetApartmentState(ApartmentState.STA);
staThread.Start();
client.AsyncRetrieveHistoryOf(info.slide);
staThread.Join();
}));
synchrony.Start();
synchrony.Join();
cache[info] = result;
return result;
}
private byte[] createImage(RequestInfo info){
var provider = info.server == "madam" ? staging : prod;
ManualResetEvent waitHandler = new ManualResetEvent(false);
byte[] result = new byte[0];
var synchrony = new Thread(new ThreadStart(delegate{
provider.Retrieve<PreParser>(
null, null,
parser =>
{
result = parserToInkCanvas(parser, info);
waitHandler.Set();
}
, info.slide.ToString());
}));
synchrony.Start();
waitHandler.WaitOne();
cache[info] = result;
return result;
}
private byte[] parserToInkCanvas(PreParser parser, RequestInfo info) {
ManualResetEvent waitHandler = new ManualResetEvent(false);
byte[] result = new byte[0];
var staThread = new Thread(new ParameterizedThreadStart(delegate
{
try
{
var canvas = new InkCanvas();
parser.Populate(canvas);
var viewBox = new Viewbox();
viewBox.Stretch = Stretch.Uniform;
viewBox.Child = canvas;
viewBox.Width = info.width;
viewBox.Height = info.height;
var size = new Size(info.width, info.height);
viewBox.Measure(size);
viewBox.Arrange(new Rect(size));
viewBox.UpdateLayout();
RenderTargetBitmap targetBitmap =
new RenderTargetBitmap(info.width, info.height, 96d, 96d, PixelFormats.Pbgra32);
targetBitmap.Render(viewBox);
PngBitmapEncoder encoder = new PngBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(targetBitmap));
using (var stream = new MemoryStream())
{
encoder.Save(stream);
result = stream.ToArray();
}
}
catch (Exception e) {
Trace.TraceInformation("{0}\n{1}", e.Message, e.StackTrace);
}
finally {
waitHandler.Set();
}
}));
staThread.SetApartmentState(ApartmentState.STA);
staThread.Start();
waitHandler.WaitOne();
return result;
}
