public int Read(String FileFullName, long Offset, int Count, ref Byte[] Buffer)
{
if (_ProtocolV2 == null)
{
throw new NFSConnectionException("NFS Client not connected!");
}
if (_MountProtocolV2 == null)
{
throw new NFSMountConnectionException("NFS Device not connected!");
}
int rCount = 0;
if (Count == 0)
{
return(0);
}
if (_CurrentItem != FileFullName)
{
NFSAttributes Attributes = GetItemAttributes(FileFullName);
_CurrentItemHandleObject = new NFSHandle(Attributes.Handle, V2.RPC.NFSv2Protocol.NFS_VERSION);
_CurrentItem = FileFullName;
}
ReadArguments dpArgRead = new ReadArguments();
dpArgRead.File = _CurrentItemHandleObject;
dpArgRead.Offset = (int)Offset;
dpArgRead.Count = Count;
ReadStatus pReadRes =
_ProtocolV2.NFSPROC_READ(dpArgRead);
if (pReadRes != null)
{
if (pReadRes.Status != NFSStats.NFS_OK)
{
ExceptionHelpers.ThrowException(pReadRes.Status);
}
rCount = pReadRes.OK.Data.Length;
Array.Copy(pReadRes.OK.Data, Buffer, rCount);
}
else
{
throw new NFSGeneralException("NFSPROC_READ: failure");
}
return(rCount);
}
/*
* Handle read request from client
*/
public (string, ImmutableVectorClock) OnReadRequest(ReadArguments arguments)
{
valueTimestamps.TryGetValue(arguments.PartitionId, out MutableVectorClock timestamp);
lock (timestamp) {
while (!(VectorClock.Equal(timestamp, arguments.Timestamp) ||
VectorClock.HappensAfter(timestamp, arguments.Timestamp)))
{
Monitor.Wait(timestamp);
}
store.Read(arguments.PartitionId, arguments.ObjectId, out string value);
return(value, timestamp.ToImmutable());
}
}
public PipelineData Process(PipelineData Input)
{
RoutedPipelineStreamOptions Options = (RoutedPipelineStreamOptions)(Input.Options);
Stream BaseStream = (Stream)Input.PrimaryData;
switch (Options.Method)
{
case RoutedPipelineStreamMethod.READ:
{
ReadArguments readArguments = (ReadArguments)Input.SecondaryData;
readArguments.Result = BaseStream.Read(readArguments.Buffer, readArguments.Offset, readArguments.Count);
}
break;
case RoutedPipelineStreamMethod.SEEK:
{
SeekArguments seekArguments = (SeekArguments)Input.SecondaryData;
seekArguments.Result = BaseStream.Seek(seekArguments.Offset, seekArguments.Origin);
}
break;
case RoutedPipelineStreamMethod.SETLENGTH:
BaseStream.SetLength((long)Input.SecondaryData);
break;
case RoutedPipelineStreamMethod.WRITE:
{
WriteArguments writeArguments = (WriteArguments)Input.SecondaryData;
BaseStream.Write(writeArguments.Buffer, writeArguments.Offset, writeArguments.Count);
}
break;
case RoutedPipelineStreamMethod.FLUSH:
{
BaseStream.Flush();
}
break;
default:
Trace.WriteLine("Unknown stream operation");
break;
}
return(Input);
}
public string Read(ReadArguments arguments)
{
store.TryGet(arguments.PartitionId, arguments.ObjectId, out string value);
return(value);
}
