private async Task AutoClearLoopAsync <TKey, TEntity>(IEntityCache <TKey, TEntity> cache, string optionsName, IBatchingStore store,
CancellationToken cancellationToken = default) where TEntity : IEntity <TKey>
{
CachingOptions options = _cachingOptions.Get(optionsName);
if (options.Lifetime < TimeSpan.Zero)
{
_log.LogDebug("{ServiceName} cache lifetime set to 0 or lower, cache purges disabled", cache.GetType().Name);
return;
}
_log.LogDebug("{ServiceName} starting cache auto-clear loop with rate of {ClearRate}", cache.GetType().Name, options.Lifetime);
while (!cancellationToken.IsCancellationRequested)
{
await Task.Delay(options.Lifetime, cancellationToken).ConfigureAwait(false);
// flush batch to prevent data loss
store?.FlushBatch();
// find and remove entities from cache
IEnumerable <TEntity> expired = cache.Find(e => e.IsExpired(options.Lifetime));
foreach (TEntity entity in expired)
{
cache.Remove(entity.ID);
}
_log.LogDebug("{RemovedCount} expired {ServiceName} entities removed from cache", expired.Count(), cache.GetType().Name);
}
}
