/// <summary>
/// Removes neighborhood actions whose target servers do not exist in our database.
/// </summary>
/// <returns>true if the function succeeds, false otherwise.</returns>
private bool DeleteInvalidNeighborhoodActions()
{
log.Info("()");
bool res = false;
using (UnitOfWork unitOfWork = new UnitOfWork())
{
DatabaseLock[] lockObjects = new DatabaseLock[] { UnitOfWork.NeighborLock, UnitOfWork.FollowerLock, UnitOfWork.NeighborhoodActionLock };
unitOfWork.AcquireLock(lockObjects);
try
{
List <byte[]> neighborIds = unitOfWork.NeighborRepository.Get().Select(n => n.NeighborId).ToList();
HashSet <byte[]> neighborIdsHashSet = new HashSet <byte[]>(neighborIds, StructuralEqualityComparer <byte[]> .Default);
List <byte[]> followerIds = unitOfWork.FollowerRepository.Get().Select(f => f.FollowerId).ToList();
HashSet <byte[]> followerIdsHashSet = new HashSet <byte[]>(followerIds, StructuralEqualityComparer <byte[]> .Default);
List <NeighborhoodAction> actions = unitOfWork.NeighborhoodActionRepository.Get().ToList();
bool saveDb = false;
foreach (NeighborhoodAction action in actions)
{
bool actionValid = false;
if (action.IsActivityAction())
{
// Action's serverId should be our follower.
actionValid = followerIdsHashSet.Contains(action.ServerId);
}
else
{
// Action's serverId should be our neighbor.
actionValid = neighborIdsHashSet.Contains(action.ServerId);
}
if (!actionValid)
{
log.Debug("Removing invalid action ID {0}, type {1}, server ID '{2}'.", action.Id, action.Type, action.ServerId.ToHex());
unitOfWork.NeighborhoodActionRepository.Delete(action);
saveDb = true;
}
}
if (saveDb)
{
res = unitOfWork.Save();
}
else
{
log.Debug("No invalid neighborhood actions found.");
res = true;
}
}
catch (Exception e)
{
log.Error("Exception occurred: {0}", e.ToString());
}
unitOfWork.ReleaseLock(lockObjects);
}
log.Info("(-):{0}", res);
return(res);
}
