private SortedList<Int64, Activity> GetFreshCache()
{
SortedList<Int64, Activity> cache = (SortedList<Int64, Activity>)Framework.Utilities.Cache.FetchObject("ActivityHistory");
object isFresh = Framework.Utilities.Cache.FetchObject("ActivityHistoryIsFresh");
if (cache == null)
{
// Grab a whole new one. This is expensive and should be unnecessary if we manage getting new ones well, so we don't do this often
cache = GetRecentActivity(-1, activityCacheSize, true);
Framework.Utilities.Cache.SetWithTimeout("ActivityHistory", cache, cacheExpirationSeconds);
}
else if (isFresh == null)
{
lock(syncLock)
{
// get new ones from the DB
Int64 lastActivityLogID = cache.Count == 0 ? -1 : cache.Values[0].Id;
SortedList<Int64, Activity> newActivities = GetRecentActivity(lastActivityLogID, activityCacheSize, false);
// in with the new
foreach (Activity activity in newActivities.Values)
{
cache.Add(activity.Id, activity);
}
// out with the old
while (cache.Count > activityCacheSize)
{
cache.RemoveAt(cache.Count - 1);
}
}
// look for new activities once every minute
Framework.Utilities.Cache.SetWithTimeout("ActivityHistoryIsFresh", new object(), chechForNewActivitiesSeconds);
}
return cache;
}
