/// <summary>
/// Queues a new image request. The request will be taken care of by an async operation.
/// </summary>
/// <param name="orgionalRequest">The image request</param>
public void QueueImageRequest(ImageManagerRequest orgionalRequest)
{
// Validate
if (String.IsNullOrWhiteSpace(orgionalRequest.Url))
{
throw new Exception("You must supply both a ULR and callback");
}
ImageManagerRequestInternal serviceRequest = null;
// Lock the list
lock (m_requestList)
{
// Add the current request to the back of the list.
m_requestList.Add(new ImageManagerRequestInternal(orgionalRequest));
// Check if we should make the request now or not. If we don't
// when a request finishes it will pick up the new request.
for (int i = 0; i < MAX_RUNNING_IMAGE_REQUESTS; i++)
{
if (m_requestList.Count > i && !m_requestList[i].isServicing)
{
serviceRequest = m_requestList[i];
serviceRequest.isServicing = true;
break;
}
}
}
if (serviceRequest != null)
{
// Kick off a new thread to service the request.
Task.Run(async() =>
{
await ServiceRequest(serviceRequest);
});
}
}
/// <summary>
/// Used to service the given request. Once the image has been responded to the
/// function will continue with requests until the queue is empty
/// </summary>
/// <param name="startingRequestedContext">The request to start with</param>
/// <returns></returns>
private async Task ServiceRequest(ImageManagerRequestInternal startingRequestedContext)
{
ImageManagerRequestInternal currentRequest = startingRequestedContext;
while (currentRequest != null)
{
// Service the request in a try catch
try
{
string fileName = MakeFileNameFromUrl(currentRequest.Context.Url);
// First check if we have the file
if (m_baconMan.CacheMan.HasFileCached(fileName))
{
// If we have it cached pull it from there
}
else
{
// If not we have to get the image
IBuffer imgBuffer = await m_baconMan.NetworkMan.MakeRawGetRequest(currentRequest.Context.Url);
// Turn the stream into an image
InMemoryRandomAccessStream imageStream = new InMemoryRandomAccessStream();
Stream readStream = imgBuffer.AsStream();
Stream writeStream = imageStream.AsStreamForWrite();
// Copy the buffer
// #todo perf - THERE HAS TO BE A BTTER WAY TO DO THIS.
readStream.CopyTo(writeStream);
writeStream.Flush();
// Seek to the start.
imageStream.Seek(0);
// Create a response
ImageManagerResponseEventArgs response = new ImageManagerResponseEventArgs()
{
ImageStream = imageStream,
Request = currentRequest.Context,
Success = true
};
// Fire the callback
currentRequest.Context.m_onRequestComplete.Raise(currentRequest.Context, response);
}
}
catch (Exception e)
{
// Report the error
m_baconMan.MessageMan.DebugDia("Error getting image", e);
// Create a response
ImageManagerResponseEventArgs response = new ImageManagerResponseEventArgs()
{
Request = currentRequest.Context,
Success = false
};
// Send the response
currentRequest.Context.m_onRequestComplete.Raise(currentRequest.Context, response);
}
// Once we are done, check to see if there is another we should service.
lock (m_requestList)
{
// Remove the current request.
m_requestList.Remove(currentRequest);
// Kill the current request
currentRequest = null;
// Check if there is another request we should service now.
for (int i = 0; i < MAX_RUNNING_IMAGE_REQUESTS; i++)
{
if (m_requestList.Count > i && !m_requestList[i].isServicing)
{
currentRequest = m_requestList[i];
currentRequest.isServicing = true;
break;
}
}
}
}
}
/// <summary>
/// Used to service the given request. Once the image has been responded to the
/// function will continue with requests until the queue is empty
/// </summary>
/// <param name="startingRequestedContext">The request to start with</param>
/// <returns></returns>
private async Task ServiceRequest(ImageManagerRequestInternal startingRequestedContext)
{
ImageManagerRequestInternal currentRequest = startingRequestedContext;
while (currentRequest != null)
{
// Service the request in a try catch
try
{
string fileName = MakeFileNameFromUrl(currentRequest.Context.Url);
// First check if we have the file
if (m_baconMan.CacheMan.HasFileCached(fileName))
{
// If we have it cached pull it from there
}
else
{
// If not we have to get the image
IBuffer imgBuffer = await m_baconMan.NetworkMan.MakeRawGetRequest(currentRequest.Context.Url);
// Turn the stream into an image
InMemoryRandomAccessStream imageStream = new InMemoryRandomAccessStream();
Stream readStream = imgBuffer.AsStream();
Stream writeStream = imageStream.AsStreamForWrite();
// Copy the buffer
// #todo perf - THERE HAS TO BE A BTTER WAY TO DO THIS.
readStream.CopyTo(writeStream);
writeStream.Flush();
// Seek to the start.
imageStream.Seek(0);
// Create a response
ImageManagerResponseEventArgs response = new ImageManagerResponseEventArgs()
{
ImageStream = imageStream,
Request = currentRequest.Context,
Success = true
};
// Fire the callback
currentRequest.Context.m_onRequestComplete.Raise(currentRequest.Context, response);
}
}
catch (Exception e)
{
// Report the error
m_baconMan.MessageMan.DebugDia("Error getting image", e);
// Create a response
ImageManagerResponseEventArgs response = new ImageManagerResponseEventArgs()
{
Request = currentRequest.Context,
Success = false
};
// Send the response
currentRequest.Context.m_onRequestComplete.Raise(currentRequest.Context, response);
}
// Once we are done, check to see if there is another we should service.
lock (m_requestList)
{
// Remove the current request.
m_requestList.Remove(currentRequest);
// Kill the current request
currentRequest = null;
// Check if there is another request we should service now.
for (int i = 0; i < MAX_RUNNING_IMAGE_REQUESTS; i++)
{
if (m_requestList.Count > i && !m_requestList[i].isServicing)
{
currentRequest = m_requestList[i];
currentRequest.isServicing = true;
break;
}
}
}
}
}
