/// <summary>
/// swallow-result -> background-thread hand-off -> multiplex ->
/// encoded cache -> disk cache -> (webp transcode) -> network fetch.
/// </summary>
private IProducer <object> GetNetworkFetchToEncodedMemoryPrefetchSequence()
{
lock (_gate)
{
if (_networkFetchToEncodedMemoryPrefetchSequence == null)
{
_networkFetchToEncodedMemoryPrefetchSequence =
ProducerFactory.NewSwallowResultProducer(
GetBackgroundNetworkFetchToEncodedMemorySequence());
}
return(_networkFetchToEncodedMemoryPrefetchSequence);
}
}
/// <summary>
/// swallow result producer -> inputProducer
/// </summary>
private IProducer <object> GetDecodedImagePrefetchSequence(
IProducer <CloseableReference <CloseableImage> > inputProducer)
{
lock (_gate)
{
if (!_closeableImagePrefetchSequences.ContainsKey(inputProducer))
{
SwallowResultProducer <CloseableReference <CloseableImage> > swallowResultProducer =
ProducerFactory.NewSwallowResultProducer(inputProducer);
_closeableImagePrefetchSequences.Add(inputProducer, swallowResultProducer);
}
var producer = default(IProducer <object>);
_closeableImagePrefetchSequences.TryGetValue(inputProducer, out producer);
return(producer);
}
}