public override Task <AggregateMetadata> GetAggregate(string keyspaceName, string aggregateName, string signatureString)
{
var query = string.Format(SelectAggregates, keyspaceName, aggregateName, signatureString);
return(Cc
.QueryAsync(query, true)
.ContinueSync(rs =>
{
var row = rs.FirstOrDefault();
if (row == null)
{
return null;
}
var emptyArray = new string[0];
var aggregate = new AggregateMetadata
{
Name = row.GetValue <string>("aggregate_name"),
KeyspaceName = row.GetValue <string>("keyspace_name"),
Signature = row.GetValue <string[]>("signature") ?? emptyArray,
StateFunction = row.GetValue <string>("state_func"),
StateType = DataTypeParser.ParseFqTypeName(row.GetValue <string>("state_type")),
FinalFunction = row.GetValue <string>("final_func"),
ReturnType = DataTypeParser.ParseFqTypeName(row.GetValue <string>("return_type")),
ArgumentTypes = (row.GetValue <string[]>("argument_types") ?? emptyArray).Select(s => DataTypeParser.ParseFqTypeName(s)).ToArray(),
};
var initConditionRaw = Deserialize(Cc, row.GetValue <byte[]>("initcond"), aggregate.StateType.TypeCode, aggregate.StateType.TypeInfo);
if (initConditionRaw != null)
{
aggregate.InitialCondition = initConditionRaw.ToString();
}
return aggregate;
}));
}
/// <summary>
/// Gets a CQL aggregate by name and signature
/// </summary>
/// <returns>The aggregate metadata or null if not found.</returns>
public AggregateMetadata GetAggregate(string aggregateName, string[] signature)
{
if (signature == null)
{
signature = new string[0];
}
AggregateMetadata aggregate;
var key = GetFunctionKey(aggregateName, signature);
if (_aggregates.TryGetValue(key, out aggregate))
{
return(aggregate);
}
var signatureString = "[" + String.Join(",", signature.Select(s => "'" + s + "'")) + "]";
var query = String.Format(SelectAggregates, Name, aggregateName, signatureString);
var row = _cc.Query(query, true).FirstOrDefault();
if (row == null)
{
return(null);
}
aggregate = AggregateMetadata.Build(_cc.ProtocolVersion, row);
_aggregates.AddOrUpdate(key, aggregate, (k, v) => aggregate);
return(aggregate);
}
/// <summary>
/// Creates a new instance of function metadata based on a schema_function row.
/// </summary>
internal static AggregateMetadata Build(int protocolVersion, Row row)
{
var emptyArray = new string[0];
var aggregate = new AggregateMetadata
{
Name = row.GetValue <string>("aggregate_name"),
KeyspaceName = row.GetValue <string>("keyspace_name"),
Signature = row.GetValue <string[]>("signature") ?? emptyArray,
StateFunction = row.GetValue <string>("state_func"),
StateType = TypeCodec.ParseDataType(row.GetValue <string>("state_type")),
FinalFunction = row.GetValue <string>("final_func"),
ReturnType = TypeCodec.ParseDataType(row.GetValue <string>("return_type")),
ArgumentTypes = (row.GetValue <string[]>("argument_types") ?? emptyArray).Select(s => TypeCodec.ParseDataType(s)).ToArray(),
};
aggregate.InitialCondition = TypeCodec.Decode(protocolVersion, row.GetValue <byte[]>("initcond"), aggregate.StateType.TypeCode, aggregate.StateType.TypeInfo);
return(aggregate);
}
/// <summary>
/// Creates a new instance of function metadata based on a schema_function row.
/// </summary>
internal static AggregateMetadata Build(int protocolVersion, Row row)
{
var emptyArray = new string[0];
var aggregate = new AggregateMetadata
{
Name = row.GetValue<string>("aggregate_name"),
KeyspaceName = row.GetValue<string>("keyspace_name"),
Signature = row.GetValue<string[]>("signature") ?? emptyArray,
StateFunction = row.GetValue<string>("state_func"),
StateType = TypeCodec.ParseDataType(row.GetValue<string>("state_type")),
FinalFunction = row.GetValue<string>("final_func"),
ReturnType = TypeCodec.ParseDataType(row.GetValue<string>("return_type")),
ArgumentTypes = (row.GetValue<string[]>("argument_types") ?? emptyArray).Select(s => TypeCodec.ParseDataType(s)).ToArray(),
};
aggregate.InitialCondition = TypeCodec.Decode(protocolVersion, row.GetValue<byte[]>("initcond"), aggregate.StateType.TypeCode, aggregate.StateType.TypeInfo);
return aggregate;
}
