public void SetSelector(TQItemSelector selector)
{
this.selector = selector;
this.QueryFeature = MongoSelector.GetQuery(this.selector);
this.SortFeature = MongoSelector.GetSort(this.selector);
OptimiseForSelector();
}
public void OptimiseForSelector()
{
CheckConnection();
try
{
Collection.EnsureIndex(MongoSelector.GetIndex(selector));
}
catch (MongoConnectionException e)
{
throw new QueueConnectionException("can't ensure index", e);
}
}
public TaskMessage GetItemFifo()
{
CheckConnection();
TaskQueue.TQItemSelector selector = TaskQueue.TQItemSelector.DefaultFifoSelector;
var cursor = Collection.Find(MongoSelector.GetQuery(selector)).SetSortOrder();
cursor.Limit = 1;
MongoMessage mms = cursor.FirstOrDefault();
if (mms == null)//empty
{
return(null);
}
TaskMessage msg = new TaskMessage(mms.ExtraElements);
msg.Holder.Add("_id", mms.id.Value);
return(msg);
}