public ChannelFeatures()
{
MediaTypes = new ChannelMediaType[] { };
ContentTypes = new ChannelMediaContentType[] { };
DefaultSortFields = new ChannelItemSortField[] { };
}
private async Task<ChannelItemResult> GetChannelItems(IChannel channel,
User user,
string folderId,
int? startIndex,
int? limit,
ChannelItemSortField? sortField,
bool sortDescending,
CancellationToken cancellationToken)
{
var userId = user.Id.ToString("N");
var cacheLength = CacheLength;
var cachePath = GetChannelDataCachePath(channel, userId, folderId, sortField, sortDescending);
try
{
if (!startIndex.HasValue && !limit.HasValue)
{
if (_fileSystem.GetLastWriteTimeUtc(cachePath).Add(cacheLength) > DateTime.UtcNow)
{
return _jsonSerializer.DeserializeFromFile<ChannelItemResult>(cachePath);
}
}
}
catch (FileNotFoundException)
{
}
catch (DirectoryNotFoundException)
{
}
await _resourcePool.WaitAsync(cancellationToken).ConfigureAwait(false);
try
{
try
{
if (!startIndex.HasValue && !limit.HasValue)
{
if (_fileSystem.GetLastWriteTimeUtc(cachePath).Add(cacheLength) > DateTime.UtcNow)
{
return _jsonSerializer.DeserializeFromFile<ChannelItemResult>(cachePath);
}
}
}
catch (FileNotFoundException)
{
}
catch (DirectoryNotFoundException)
{
}
var query = new InternalChannelItemQuery
{
UserId = userId,
StartIndex = startIndex,
Limit = limit,
SortBy = sortField,
SortDescending = sortDescending
};
if (!string.IsNullOrWhiteSpace(folderId))
{
var categoryItem = (IChannelItem)_libraryManager.GetItemById(new Guid(folderId));
query.FolderId = categoryItem.ExternalId;
}
var result = await channel.GetChannelItems(query, cancellationToken).ConfigureAwait(false);
if (!startIndex.HasValue && !limit.HasValue)
{
CacheResponse(result, cachePath);
}
return result;
}
finally
{
_resourcePool.Release();
}
}
private string GetChannelDataCachePath(IChannel channel,
string userId,
string folderId,
ChannelItemSortField? sortField,
bool sortDescending)
{
var channelId = GetInternalChannelId(channel.Name).ToString("N");
var userCacheKey = string.Empty;
var hasCacheKey = channel as IHasCacheKey;
if (hasCacheKey != null)
{
userCacheKey = hasCacheKey.GetCacheKey(userId) ?? string.Empty;
}
var filename = string.IsNullOrWhiteSpace(folderId) ? "root" : folderId;
filename += userCacheKey;
var version = (channel.DataVersion ?? string.Empty).GetMD5().ToString("N");
if (sortField.HasValue)
{
filename += "-sortField-" + sortField.Value;
}
if (sortDescending)
{
filename += "-sortDescending";
}
filename = filename.GetMD5().ToString("N");
return Path.Combine(_config.ApplicationPaths.CachePath,
"channels",
channelId,
version,
filename + ".json");
}
