/// <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 using cluster file '{db.ClusterFile}'");
}
// look up in the root layer for the named partition
var descriptor = await db.ReadWriteAsync(tr => db.Directory.CreateOrOpenAsync(tr, path, layer: FdbDirectoryPartition.LayerId), 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}");
}
}
/// <summary>Opens a named partition, and change the root subspace of the database to the corresponding prefix</summary>
internal static async Task SwitchToNamedPartitionAsync(FdbDatabase db, FdbPath root, CancellationToken ct)
{
Contract.Requires(db != null);
ct.ThrowIfCancellationRequested();
if (Logging.On)
{
Logging.Verbose(typeof(Fdb.Directory), "OpenNamedPartitionAsync", $"Opened root layer using cluster file '{db.ClusterFile}'");
}
if (root.Count != 0)
{
// create the root partition if does not already exist
var descriptor = await db.ReadWriteAsync(tr => db.DirectoryLayer.CreateOrOpenAsync(tr, root), ct).ConfigureAwait(false);
if (Logging.On)
{
Logging.Info(typeof(Fdb.Directory), "OpenNamedPartitionAsync", $"Opened partition {descriptor.Path} at {descriptor.GetPrefixUnsafe()}");
}
}
}
