/// <summary>Checks the black list and returns whether the item is new or not.</summary>
/// <param name="itemType">Type of the item.</param>
/// <param name="itemGuid">The item unique identifier.</param>
/// <returns>Returns true if the item was not blacklisted, false otherwise</returns>
public bool CheckBlackList(MDBCrawlerBlackListItemType itemType, BinaryGuid itemGuid)
{
lock (CrawlerBlackList)
{
MDBCrawlerBlackListItem item = CrawlerBlackList.TryGetStruct(
Search.FieldEquals(nameof(MDBCrawlerBlackListItem.Type), itemType) &
Search.FieldEquals(nameof(MDBCrawlerBlackListItem.Guid), itemGuid));
//item already present?
if (item.ID > 0)
{
//yes, is expired -> no = false
if (DateTime.UtcNow < item.Expire)
{
return(false);
}
//yes = true;
}
else
{
//new blacklist item
CrawlerBlackList.Insert(new MDBCrawlerBlackListItem()
{
Guid = itemGuid,
Type = itemType,
Expire = DateTime.UtcNow.AddDays(14),
});
}
return(true);
}
}
/// <summary>Removes all expired items from the blacklist.</summary>
public void CleanBlackList()
{
CrawlerBlackList?.TryDelete(Search.FieldSmaller(nameof(MDBCrawlerBlackListItem.Expire), DateTime.UtcNow));
}