static YouTubeVideoSource()
{
All = new List<YouTubeVideoSource>();
// Seed the global tags list with some interesting keywords/buzzwords that might not fit into local source tags
GlobalTags = new HashSet<string>
{
"asp.net", ".net", "windows 10", "c#", "machine learning", "big data", "tutorial", "beginner", "mvc", "roslyn", "docker",
"internet of things", "time series", "data model"
};
// Init all available sources
PlanetCassandra = new VideosFromChannel("UCvP-AXuCr-naAeEccCfKwUA", new [] { "cassandra", "database", "nosql" });
DataStaxMedia = new VideosFromChannel("UCqA6zOSMpQ55vvguq4Y0jAg", new[] { "datastax", "cassandra", "database", "nosql" });
MicrosoftAzure = new VideosFromChannel("UC0m-80FnNY2Qb7obvTL_2fA", new[] { "microsoft", "azure", "cloud", "windows", "linux" });
MicrosoftCloudPlatform = new VideosFromChannel("UCSgzRJMqIiCNtoM6Q7Q9Lqw", new[] { "microsoft", "azure", "cloud", "windows", "linux" });
Hanselman = new VideosFromChannel("UCL-fHOdarou-CR2XUmK48Og", new[] { "microsoft", "windows", "linux", "azure" });
CassandraDatabase = new VideosWithKeyword("cassandra database", new[] { "cassandra", "database", "nosql" });
FunnyCatVideos = new VideosWithKeyword("funny cat videos", new[] { "cat", "funny" });
GrumpyCat = new VideosFromChannel("UCTzVrd9ExsI3Zgnlh3_btLg", new[] { "grumpy cat", "funny" });
MovieTrailers = new VideosFromChannel("UCi8e0iOVk1fEOogdfu4YgfA", new[] { "movie", "trailer", "preview" });
Snl = new VideosFromChannel("UCqFzWxSCi39LnW1JKFR3efg", new[] { "snl", "saturday night live", "comedy" });
KeyAndPeele = new VideosFromPlaylist("PL83DDC2327BEB616D", new[] { "key and peele", "comedy" });
}
static YouTubeVideoSource()
{
All = new List <YouTubeVideoSource>();
// Seed the global tags list with some interesting keywords/buzzwords that might not fit into local source tags
GlobalTags = new HashSet <string>
{
"asp.net", ".net", "windows 10", "c#", "machine learning", "big data", "tutorial", "beginner", "mvc", "roslyn", "docker",
"internet of things", "time series", "data model"
};
// Init all available sources
PlanetCassandra = new VideosFromChannel("UCvP-AXuCr-naAeEccCfKwUA", new [] { "cassandra", "database", "nosql" });
DataStaxMedia = new VideosFromChannel("UCqA6zOSMpQ55vvguq4Y0jAg", new[] { "datastax", "cassandra", "database", "nosql" });
MicrosoftAzure = new VideosFromChannel("UC0m-80FnNY2Qb7obvTL_2fA", new[] { "microsoft", "azure", "cloud", "windows", "linux" });
MicrosoftCloudPlatform = new VideosFromChannel("UCSgzRJMqIiCNtoM6Q7Q9Lqw", new[] { "microsoft", "azure", "cloud", "windows", "linux" });
Hanselman = new VideosFromChannel("UCL-fHOdarou-CR2XUmK48Og", new[] { "microsoft", "windows", "linux", "azure" });
CassandraDatabase = new VideosWithKeyword("cassandra database", new[] { "cassandra", "database", "nosql" });
FunnyCatVideos = new VideosWithKeyword("funny cat videos", new[] { "cat", "funny" });
GrumpyCat = new VideosFromChannel("UCTzVrd9ExsI3Zgnlh3_btLg", new[] { "grumpy cat", "funny" });
MovieTrailers = new VideosFromChannel("UCi8e0iOVk1fEOogdfu4YgfA", new[] { "movie", "trailer", "preview" });
Snl = new VideosFromChannel("UCqFzWxSCi39LnW1JKFR3efg", new[] { "snl", "saturday night live", "comedy" });
KeyAndPeele = new VideosFromPlaylist("PL83DDC2327BEB616D", new[] { "key and peele", "comedy" });
}
private static YouTubeVideo MapToYouTubeVideo(Row row, YouTubeVideoSource source, Random random)
{
// Map to video
var video = new YouTubeVideo
{
Source = source,
PublishedAt = row.GetValue <DateTimeOffset>("published_at"),
YouTubeVideoId = row.GetValue <string>("youtube_video_id"),
Name = row.GetValue <string>("name"),
Description = row.GetValue <string>("description")
};
// Choose some tags for the video (this isn't a fantastic way to do this, but since it's sample data, it will do)
var tags = new HashSet <string>();
int maxTags = random.Next(3, 6);
string lowerName = video.Name.ToLowerInvariant();
string lowerDescription = video.Description.ToLowerInvariant();
foreach (string possibleTag in source.PossibleTags)
{
if (lowerName.Contains(possibleTag) || lowerDescription.Contains(possibleTag))
{
tags.Add(possibleTag);
}
if (tags.Count == maxTags)
{
break;
}
}
// If we didn't get any tags, just pick some random ones specific to the source
if (tags.Count == 0)
{
foreach (string tag in source.SourceTags.Take(maxTags))
{
tags.Add(tag);
}
}
// Return video with suggested tags
video.SuggestedTags = tags;
return(video);
}
/// <summary>
/// Gets a list of unused YouTubeVideos with the page size specified.
/// </summary>
public async Task <List <YouTubeVideo> > GetUnusedVideos(int pageSize)
{
// Statement for getting unused videos from a source
PreparedStatement prepared =
await _statementCache.NoContext.GetOrAddAsync("SELECT * FROM sample_data_youtube_videos WHERE sourceid = ?");
// Iterate the list of sources in random order
var random = new Random();
var indexes = Enumerable.Range(0, YouTubeVideoSource.All.Count).OrderBy(_ => random.Next());
// Build a list of unused videos from the available sources in random order
var unusedVideos = new List <YouTubeVideo>();
foreach (int idx in indexes)
{
YouTubeVideoSource source = YouTubeVideoSource.All[idx];
// Use automatic paging to page through all the videos from the source
BoundStatement bound = prepared.Bind(source.UniqueId);
bound.SetPageSize(MaxVideosPerRequest);
RowSet rowSet = await _session.ExecuteAsync(bound).ConfigureAwait(false);
foreach (Row row in rowSet)
{
var used = row.GetValue <bool?>("used");
if (used == false || used == null)
{
unusedVideos.Add(MapToYouTubeVideo(row, source, random));
}
// If we've got enough videos, return them
if (unusedVideos.Count == pageSize)
{
return(unusedVideos);
}
}
}
// We were unable to fill the quota, so throw
throw new InvalidOperationException("Unable to get unused videos. Time to add more sources?");
}
/// <summary>
/// Refreshes the videos cached in Cassandra for the given source.
/// </summary>
public Task RefreshSource(YouTubeVideoSource source)
{
return(source.RefreshVideos(this));
}