/// <summary>Opens a named partition, and change the root subspace of the database to the corresponding prefix</summary>
internal static async Task SwitchToNamedPartitionAsync([NotNull] FdbDatabase db, [NotNull, ItemNotNull] string[] path, bool readOnly, CancellationToken ct)
{
Contract.Requires(db != null && path != null);
ct.ThrowIfCancellationRequested();
if (path.Length == 0)
{
throw new ArgumentException("The path to the named partition cannot be empty", nameof(path));
}
if (Logging.On)
{
Logging.Verbose(typeof(Fdb.Directory), "OpenNamedPartitionAsync", $"Opened root layer of database {db.Name} using cluster file '{db.Cluster.Path}'");
}
// look up in the root layer for the named partition
var descriptor = await db.Directory.CreateOrOpenAsync(path, layer : FdbDirectoryPartition.LayerId, ct : ct).ConfigureAwait(false);
if (Logging.On)
{
Logging.Verbose(typeof(Fdb.Directory), "OpenNamedPartitionAsync", $"Found named partition '{descriptor.FullName}' at prefix {descriptor}");
}
// we have to chroot the database to the new prefix, and create a new DirectoryLayer with a new '/'
var rootSpace = descriptor.Copy(); //note: create a copy of the key
//TODO: find a nicer way to do that!
db.ChangeRoot(rootSpace, FdbDirectoryLayer.Create(rootSpace, path), readOnly);
if (Logging.On)
{
Logging.Info(typeof(Fdb.Directory), "OpenNamedPartitionAsync", $"Opened partition {descriptor.FullName} at {db.GlobalSpace}, using directory layer at {db.Directory.DirectoryLayer.NodeSubspace}");
}
}
public static async Task <IFdbDatabase> OpenNamedPartitionAsync(string clusterFile, string dbName, [NotNull] IEnumerable <string> path, bool readOnly, CancellationToken ct)
{
if (path == null)
{
throw new ArgumentNullException(nameof(path));
}
var partitionPath = path.ToList();
if (partitionPath.Count == 0)
{
throw new ArgumentException("The path to the named partition cannot be empty", nameof(path));
}
// looks at the global partition table for the specified named partition
// By convention, all named databases will be under the "/Databases" folder
FdbDatabase db = null;
var rootSpace = KeySubspace.Empty;
try
{
db = await Fdb.OpenInternalAsync(clusterFile, dbName, rootSpace, readOnly : false, ct : ct).ConfigureAwait(false);
var rootLayer = FdbDirectoryLayer.Create(rootSpace);
if (Logging.On)
{
Logging.Verbose(typeof(Fdb.Directory), "OpenNamedPartitionAsync", $"Opened root layer of database {db.Name} using cluster file '{db.Cluster.Path}'");
}
// look up in the root layer for the named partition
var descriptor = await rootLayer.CreateOrOpenAsync(db, partitionPath, layer : FdbDirectoryPartition.LayerId, ct : ct).ConfigureAwait(false);
if (Logging.On)
{
Logging.Verbose(typeof(Fdb.Directory), "OpenNamedPartitionAsync", $"Found named partition '{descriptor.FullName}' at prefix {descriptor}");
}
// we have to chroot the database to the new prefix, and create a new DirectoryLayer with a new '/'
rootSpace = descriptor.Copy(); //note: create a copy of the key
//TODO: find a nicer way to do that!
db.ChangeRoot(rootSpace, FdbDirectoryLayer.Create(rootSpace, partitionPath), readOnly);
if (Logging.On)
{
Logging.Info(typeof(Fdb.Directory), "OpenNamedPartitionAsync", $"Opened partition {descriptor.FullName} at {db.GlobalSpace}, using directory layer at {db.Directory.DirectoryLayer.NodeSubspace}");
}
return(db);
}
catch (Exception e)
{
db?.Dispose();
if (Logging.On)
{
Logging.Exception(typeof(Fdb.Directory), "OpenNamedPartitionAsync", e);
}
throw;
}
}
