/// <summary>
/// Clears the existing cache.
/// </summary>
public void ClearCache()
{
KnownFollowers.Clear();
_lastFollowerDates.Clear();
_nameBasedMonitor?.ClearCache();
_nameBasedMonitor = null;
_idBasedMonitor = null;
}
/// <summary>
/// Updates the followerservice with the latest followers. Automatically called internally when service is started.
/// </summary>
/// <param name="callEvents">Whether to invoke the update events or not.</param>
public async Task UpdateLatestFollowersAsync(bool callEvents = true)
{
if (ChannelsToMonitor == null)
{
return;
}
foreach (var channel in ChannelsToMonitor)
{
List <Follow> newFollowers;
var latestFollowers = await GetLatestFollowersAsync(channel);
if (latestFollowers.Count == 0)
{
return;
}
if (!KnownFollowers.TryGetValue(channel, out var knownFollowers))
{
newFollowers = latestFollowers;
KnownFollowers[channel] = latestFollowers.Take(CacheSize).ToList();
_lastFollowerDates[channel] = latestFollowers.Last().FollowedAt;
}
else
{
var existingFollowerIds = new HashSet <string>(knownFollowers.Select(f => f.FromUserId));
var latestKnownFollowerDate = _lastFollowerDates[channel];
newFollowers = new List <Follow>();
foreach (var follower in latestFollowers)
{
if (!existingFollowerIds.Add(follower.FromUserId))
{
continue;
}
if (follower.FollowedAt < latestKnownFollowerDate)
{
continue;
}
newFollowers.Add(follower);
latestKnownFollowerDate = follower.FollowedAt;
knownFollowers.Add(follower);
}
existingFollowerIds.Clear();
existingFollowerIds.TrimExcess();
// prune cache so we don't use too much space unnecessarily
if (knownFollowers.Count > CacheSize)
{
knownFollowers.RemoveRange(0, knownFollowers.Count - CacheSize);
}
if (newFollowers.Count <= 0)
{
return;
}
_lastFollowerDates[channel] = latestKnownFollowerDate;
}
if (!callEvents)
{
return;
}
OnNewFollowersDetected?.Invoke(this, new OnNewFollowersDetectedArgs {
Channel = channel, NewFollowers = newFollowers
});
}
}
