public override void execute(MetaDataServer md)
{
if (!md.FileMetadata.ContainsKey(Filename))
{
throw new OpenFileException("#MDS.open - File " + Filename + " does not exist");
}
else if (md.FileMetadata[Filename].Clients.Contains(ClientID))
{
Console.WriteLine("#MDS.open - File " + Filename + " is already open for user " + ClientID);
Result = md.FileMetadata[Filename];
return;
}
else
{
Console.WriteLine("#MDS: opening file: " + Filename);
lock (Filename)
{
md.FileMetadata[Filename].IsOpen = true;
md.FileMetadata[Filename].Clients.Add(ClientID);
md.makeCheckpoint();
Result = md.FileMetadata[Filename];
}
}
}
public override void execute(MetaDataServer md)
{
if (!md.FileMetadata.ContainsKey(Filename))
{
throw new CommonTypes.Exceptions.DeleteFileException("#MDS.delete - File " + Filename + " does not exist");
}
md.FileMetadata.Remove(Filename);
Console.WriteLine("#MDS: Deleted file: " + Filename);
md.makeCheckpoint();
}
public override void execute(MetaDataServer md)
{
Console.WriteLine("#MDS: Registering DS " + DataServerId);
if ( md.DataServers.ContainsKey(DataServerId) )
{
md.DataServers.Remove(DataServerId);
}
ServerObjectWrapper remoteObjectWrapper = new ServerObjectWrapper(DataServerPort, DataServerId, DataServerHost);
md.DataServers.Add(DataServerId, remoteObjectWrapper);
md.addServerToUnbalancedFiles(DataServerId);
HeartbeatMessage heartbeat = new HeartbeatMessage(DataServerId, 0 , 0, 0, 0, new Dictionary<string,FileAccessCounter>());
md.receiveHeartbeat(heartbeat);
md.makeCheckpoint();
}
public override void execute(MetaDataServer md)
{
if (!md.FileMetadata.ContainsKey(Filename))
{
// throw new CloseFileException("#MDS.close - File " + Filename + " does not exist");
return;
}
if (md.FileMetadata.ContainsKey(Filename) && !md.FileMetadata[Filename].Clients.Contains(ClientID))
{
//throw new CloseFileException("#MDS.close - File " + filename + " is not open for user " + clientID);
Console.WriteLine("#MDS.close - File " + Filename + " is already closed for user " + ClientID);
return;
}
Console.WriteLine("#MDS: closing file " + Filename + "...");
md.FileMetadata[Filename].Clients.Remove(ClientID);
if (md.FileMetadata[Filename].Clients.Count == 0)
{
md.FileMetadata[Filename].IsOpen = false;
}
md.makeCheckpoint();
}
public override void execute(MetaDataServer md)
{
if ((WriteQuorum > NumberOfDataServers) || (ReadQuorum > NumberOfDataServers))
{
throw new CreateFileException("Invalid quorums values in create " + Filename);
}
if (md.FileMetadata.ContainsKey(Filename))
{
throw new CreateFileException("#MDS.create - The file " + Filename + " already exists ");
}
// List<ServerObjectWrapper> newFileDataServers = getFirstServers(md, NumberOfDataServers);
List<ServerObjectWrapper> newFileDataServers = md.getSortedServers(NumberOfDataServers);
FileMetadata newFileMetadata = new FileMetadata(Filename, NumberOfDataServers, ReadQuorum, WriteQuorum, newFileDataServers);
md.FileMetadata.Add(Filename, newFileMetadata);
md.addMetadataLock(Filename, new ManualResetEvent(false));
md.getMigratingFiles().Add(Filename, new List<Tuple<string, string>>());
Console.WriteLine("#MDS: Created " + Filename);
md.makeCheckpoint();
Result = md.FileMetadata[Filename];
}
