/// <summary>
/// Returns a collection of all defined keyspaces names.
/// </summary>
/// <returns>a collection of all defined keyspaces names.</returns>
public ICollection <string> GetKeyspaces()
{
if (Configuration.MetadataSyncOptions.MetadataSyncEnabled)
{
//Use local cache
return(_keyspaces.Keys);
}
return(TaskHelper.WaitToComplete(SchemaParser.GetKeyspacesNamesAsync(), _queryAbortTimeout));
}
/// <summary>
/// Gets the definition associated with a User Defined Type from Cassandra
/// </summary>
public Task <UdtColumnInfo> GetUdtDefinitionAsync(string keyspace, string typeName)
{
if (Configuration.MetadataSyncOptions.MetadataSyncEnabled)
{
return(!_keyspaces.TryGetValue(keyspace, out var ksMetadata)
? Task.FromResult <UdtColumnInfo>(null)
: ksMetadata.GetUdtDefinitionAsync(typeName));
}
return(SchemaParser.GetUdtDefinitionAsync(keyspace, typeName));
}
/// <summary>
/// Returns the view metadata for the provided view name in the keyspace.
/// </summary>
/// <param name="keyspace">name of the keyspace within specified view is defined.</param>
/// <param name="name">name of view.</param>
/// <returns>a MaterializedViewMetadata for the view in the specified keyspace.</returns>
public MaterializedViewMetadata GetMaterializedView(string keyspace, string name)
{
if (Configuration.MetadataSyncOptions.MetadataSyncEnabled)
{
return(!_keyspaces.TryGetValue(keyspace, out var ksMetadata)
? null
: ksMetadata.GetMaterializedViewMetadata(name));
}
return(TaskHelper.WaitToComplete(SchemaParser.GetViewAsync(keyspace, name), _queryAbortTimeout * 2));
}
internal Task <TableMetadata> GetTableAsync(string keyspace, string tableName)
{
if (Configuration.MetadataSyncOptions.MetadataSyncEnabled)
{
return(!_keyspaces.TryGetValue(keyspace, out var ksMetadata)
? Task.FromResult <TableMetadata>(null)
: ksMetadata.GetTableMetadataAsync(tableName));
}
return(SchemaParser.GetTableAsync(keyspace, tableName));
}
/// <summary>
/// Returns names of all tables which are defined within specified keyspace.
/// </summary>
/// <param name="keyspace">the name of the keyspace for which all tables metadata should be
/// returned.</param>
/// <returns>an ICollection of the metadata for the tables defined in this
/// keyspace.</returns>
public ICollection <string> GetTables(string keyspace)
{
if (Configuration.MetadataSyncOptions.MetadataSyncEnabled)
{
return(!_keyspaces.TryGetValue(keyspace, out var ksMetadata)
? new string[0]
: ksMetadata.GetTablesNames());
}
return(TaskHelper.WaitToComplete(SchemaParser.GetTableNamesAsync(keyspace), _queryAbortTimeout));
}
/// <summary>
/// Returns metadata of specified keyspace.
/// </summary>
/// <param name="keyspace"> the name of the keyspace for which metadata should be
/// returned. </param>
/// <returns>the metadata of the requested keyspace or <c>null</c> if
/// <c>* keyspace</c> is not a known keyspace.</returns>
public KeyspaceMetadata GetKeyspace(string keyspace)
{
if (Configuration.MetadataSyncOptions.MetadataSyncEnabled)
{
//Use local cache
_keyspaces.TryGetValue(keyspace, out var ksInfo);
return(ksInfo);
}
return(TaskHelper.WaitToComplete(SchemaParser.GetKeyspaceAsync(keyspace), _queryAbortTimeout));
}
/// <summary>
/// Gets the definition associated with a aggregate from Cassandra
/// </summary>
/// <returns>The aggregate metadata or null if not found.</returns>
public AggregateMetadata GetAggregate(string keyspace, string name, string[] signature)
{
if (Configuration.MetadataSyncOptions.MetadataSyncEnabled)
{
return(!_keyspaces.TryGetValue(keyspace, out var ksMetadata)
? null
: ksMetadata.GetAggregate(name, signature));
}
var signatureString = SchemaParser.ComputeFunctionSignatureString(signature);
return(TaskHelper.WaitToComplete(SchemaParser.GetAggregateAsync(keyspace, name, signatureString), _queryAbortTimeout));
}
/// <summary>
/// Creates a new instance if the currentInstance is not valid for the given Cassandra version
/// </summary>
public static SchemaParser GetInstance(Version cassandraVersion, Metadata parent,
Func <string, string, Task <UdtColumnInfo> > udtResolver,
SchemaParser currentInstance = null)
{
if (cassandraVersion >= Version40 && !(currentInstance is SchemaParserV3))
{
return(new SchemaParserV3(parent, udtResolver));
}
if (cassandraVersion >= Version30 && !(currentInstance is SchemaParserV2))
{
return(new SchemaParserV2(parent, udtResolver));
}
if (cassandraVersion < Version30 && !(currentInstance is SchemaParserV1))
{
return(new SchemaParserV1(parent));
}
if (currentInstance == null)
{
throw new ArgumentNullException(nameof(currentInstance));
}
return(currentInstance);
}
/// <summary>
/// Sets the Cassandra version in order to identify how to parse the metadata information
/// </summary>
/// <param name="version"></param>
internal void SetCassandraVersion(Version version)
{
_schemaParser = SchemaParser.GetInstance(version, this, GetUdtDefinitionAsync, _schemaParser);
}
internal Metadata(Configuration configuration, SchemaParser schemaParser) : this(configuration)
{
_schemaParser = schemaParser;
}
