async Task <AssetEntry <ISyncModel> > DownloadSyncModel(StreamKey streamKey, string hash, CancellationToken token)
{
StreamCache cache;
lock (m_StreamCaches)
{
if (!m_StreamCaches.TryGetValue(streamKey, out cache))
{
m_StreamCaches[streamKey] = cache = new StreamCache(streamKey);
}
}
Task <ISyncModel> task;
var isTaskOwner = false;
lock (cache)
{
if (cache.model != null && cache.hash == hash)
{
return(new AssetEntry <ISyncModel>(streamKey, cache.model));
}
if (cache.task != null)
{
task = cache.task;
}
else
{
isTaskOwner = true;
cache.model = null;
cache.hash = hash;
cache.task = task = m_Client.GetSyncModelAsync(cache.streamKey, cache.hash); // TODO Cancellation Token
}
}
token.ThrowIfCancellationRequested();
var syncModel = await task;
if (isTaskOwner)
{
lock (cache)
{
cache.model = syncModel;
cache.task = null;
}
}
return(new AssetEntry <ISyncModel>(streamKey, syncModel));
}
async Task DownloadInstance(StreamAsset request, CancellationToken token)
{
DownloadResult result;
try
{
var instance = (SyncObjectInstance)await m_Client.GetSyncModelAsync(request.key, request.hash); // TODO Cancellation Token
result = new DownloadResult(request, instance, null);
}
catch (Exception ex)
{
result = new DownloadResult(request, null, ex);
}
m_DownloadResults.Enqueue(result);
}
