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add_virtual_instrument.sql

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    FastFileStream.h 2.12 KiB
    //# FastFileStream.h: a FileStream using O_DIRECT
    //# Copyright (C) 2012-2013  ASTRON (Netherlands Institute for Radio Astronomy)
    //# P.O. Box 2, 7990 AA Dwingeloo, The Netherlands
    //#
    //# This file is part of the LOFAR software suite.
    //# The LOFAR software suite is free software: you can redistribute it and/or
    //# modify it under the terms of the GNU General Public License as published
    //# by the Free Software Foundation, either version 3 of the License, or
    //# (at your option) any later version.
    //#
    //# The LOFAR software suite is distributed in the hope that it will be useful,
    //# but WITHOUT ANY WARRANTY; without even the implied warranty of
    //# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    //# GNU General Public License for more details.
    //#
    //# You should have received a copy of the GNU General Public License along
    //# with the LOFAR software suite. If not, see <http://www.gnu.org/licenses/>.
    //#
    //# $Id$
    
    #ifndef LOFAR_STORAGE_FASTFILESTREAM_H
    #define LOFAR_STORAGE_FASTFILESTREAM_H
    
    #include <string>
    #include <Stream/FileStream.h>
    #include <CoInterface/SmartPtr.h>
    
    namespace LOFAR
    {
      namespace Cobalt
      {
    
        class FastFileStream : public FileStream
        {
        public:
          FastFileStream(const std::string &name, int flags, int mode); // rd/wr; create file
    
          virtual size_t tryWrite(const void *ptr, size_t size);
          virtual ~FastFileStream();
    
          virtual void skip( size_t bytes );
    
          virtual size_t size();
    
          // formally, the required alignment for O_DIRECT is determined by the file system
          static const unsigned alignment = 512;
        private:
          // writes the remainder, padded with zeros if needed. Returns the number of bytes written.
          size_t writeRemainder();
    
          // we only support writing
          virtual size_t tryRead(void *, size_t size)
          {
            return size;
          }
    
          // enlarge the buffer if needed
          void ensureBuffer(size_t newsize);
    
          // use the FileStream to force these data to disk
          void forceWrite(const void *ptr, size_t size);
    
          size_t bufsize;
          SmartPtr<char, SmartPtrFree<char> > buffer;
          size_t remainder;
        };
    
      }
    }
    
    #endif