/// <summary>Change the current global namespace.</summary>
/// <remarks>Do NOT call this, unless you know exactly what you are doing !</remarks>
internal void ChangeRoot(FdbSubspace subspace, IFdbDirectory directory, bool readOnly)
{
subspace = subspace ?? FdbSubspace.Empty;
lock (this) //TODO: don't use this for locking
{
m_readOnly = readOnly;
m_globalSpace = subspace;
m_globalSpaceCopy = subspace.Copy();
m_directory = directory == null ? null : new FdbDatabasePartition(this, directory);
}
}
public static async Task <IFdbDatabase> OpenNamedPartitionAsync(string clusterFile, string dbName, [NotNull] IEnumerable <string> path, bool readOnly, CancellationToken cancellationToken)
{
if (path == null)
{
throw new ArgumentNullException("path");
}
var partitionPath = path.ToList();
if (partitionPath.Count == 0)
{
throw new ArgumentException("The path to the named partition cannot be empty", "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 = FdbSubspace.Empty;
try
{
db = await Fdb.OpenInternalAsync(clusterFile, dbName, rootSpace, readOnly : false, cancellationToken : cancellationToken).ConfigureAwait(false);
var rootLayer = FdbDirectoryLayer.Create(rootSpace);
if (Logging.On)
{
Logging.Verbose(typeof(Fdb.Directory), "OpenNamedPartitionAsync", String.Format("Opened root layer of database {0} using cluster file '{1}'", db.Name, db.Cluster.Path));
}
// look up in the root layer for the named partition
var descriptor = await rootLayer.CreateOrOpenAsync(db, partitionPath, layer : FdbDirectoryPartition.LayerId, cancellationToken : cancellationToken).ConfigureAwait(false);
if (Logging.On)
{
Logging.Verbose(typeof(Fdb.Directory), "OpenNamedPartitionAsync", String.Format("Found named partition '{0}' at prefix {1}", descriptor.FullName, descriptor));
}
// we have to chroot the database to the new prefix, and create a new DirectoryLayer with a new '/'
rootSpace = FdbSubspace.Copy(descriptor); //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", String.Format("Opened partition {0} at {1}, using directory layer at {2}", descriptor.FullName, db.GlobalSpace, db.Directory.DirectoryLayer.NodeSubspace));
}
return(db);
}
catch (Exception e)
{
if (db != null)
{
db.Dispose();
}
if (Logging.On)
{
Logging.Exception(typeof(Fdb.Directory), "OpenNamedPartitionAsync", e);
}
throw;
}
}