/// <summary>
/// background-thread hand-off -> multiplex -> encoded cache ->
/// disk cache -> (webp transcode) -> network fetch.
/// </summary>
private IProducer <EncodedImage> GetBackgroundNetworkFetchToEncodedMemorySequence()
{
lock (_gate)
{
if (_backgroundNetworkFetchToEncodedMemorySequence == null)
{
// Use hand-off producer to ensure that we don't do any unnecessary work
// on the UI thread.
_backgroundNetworkFetchToEncodedMemorySequence =
_producerFactory.NewBackgroundThreadHandoffProducer(
GetCommonNetworkFetchToEncodedMemorySequence(),
_threadHandoffProducerQueue);
}
return(_backgroundNetworkFetchToEncodedMemorySequence);
}
}