/// <summary>
/// Get the id of the <paramref name="tags"/> from the database or
/// create a new id for the <paramref name="tags"/> if an id is not found.
/// </summary>
/// <param name="name">
/// The name of the <see cref="MetricConfig"/> that is associated with
/// the <paramref name="tags"/>.
/// </param>
/// <param name="tags">
/// The tags to get the id.
/// </param>
/// <returns>
/// A number that uniquely identifies the tags within the metrics database.
/// </returns>
long TagsIdFromDatabase(string name, Tags tags)
{
int hash = Hash(name, tags);
IEnumerable <long> ids = metrics_dao_.GetSeriesIds(name, hash, tags.Count);
// The |GetTagsIds| return all the ids that has the same hash and
// number of tags of the given |tags|. We need to find the tags group
// that contains the same tags as |tags|.
foreach (var id in ids)
{
if (IsSameTags(id, tags))
{
return(id);
}
}
// A matching tags was not found, lets create a new one. A transaction scope
// is used to endure that all tags related with a given serie is registered.
using (var scope = new TransactionScope(TransactionScopeOption.Required)) {
long serie_id = metrics_dao_.RegisterSerie(name, hash, tags.Count);
foreach (Tag tag in tags)
{
metrics_dao_.RegisterTag(tag.Name, tag.Value, serie_id);
}
scope.Complete();
return(serie_id);
}
}
