DiskWriteTask.hpp 3.58 KB
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/******************************************************************************
 *
 * This file is part of the Castor project.
 * See http://castor.web.cern.ch/castor
 *
 * Copyright (C) 2003  CERN
 * This program 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 2
 * of the License, or (at your option) any later version.
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * 
 *
 * @author Castor Dev team, castor-dev@cern.ch
 *****************************************************************************/

#pragma once

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#include "castor/tape/tapeserver/daemon/DataPipeline.hpp"
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#include "castor/tape/tapeserver/daemon/RecallMemoryManager.hpp"
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#include "castor/tape/tapeserver/daemon/DataConsumer.hpp"
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#include "castor/tape/tapeserver/file/File.hpp"
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#include "castor/tape/tapegateway/FileToRecallStruct.hpp"
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#include "castor/tape/tapeserver/daemon/RecallReportPacker.hpp"
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#include <memory>
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namespace {
  
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  // TODO: merge with same function in File.hpp and move to tape/utils
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  uint32_t blockID(const castor::tape::tapegateway::FileToRecallStruct& ftr)
  {
    return (ftr.blockId0() << 24) | (ftr.blockId1() << 16) |  (ftr.blockId2() << 8) | ftr.blockId3();
  }
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}
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namespace castor {
namespace tape {
namespace tapeserver {
namespace daemon {
  
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/**
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 * The DiskWriteFileTask is responsible to write a single file onto disk as part of a recall
 * session. Being a consumer of memory blocks, it inherits from the DataConsumer class. It also
 * inherits several methods from the DiskWriteTask (TODO: do we really need this base class?).
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 */
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class DiskWriteTask: public DataConsumer {
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public:
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  /**
   * Constructor
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   * @param file: All we need to know about the file we  are recalling
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   * @param mm: memory manager of the session
   */
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  DiskWriteTask(tape::tapegateway::FileToRecallStruct* file,RecallMemoryManager& mm);
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  /**
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   * Main routine: takes each memory block in the fifo and writes it to disk
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   * @return true if the file has been successfully written false otherwise.
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   */
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  virtual bool execute(RecallReportPacker& reporter,log::LogContext& lc) ;
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  /**
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   * Allows client code to return a reusable memory block. Should not been called
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   * @return the pointer to the memory block that can be reused
   */
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  virtual MemBlock *getFreeBlock() ;
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  /**
   * Function used to enqueue a new memory block holding data to be written to disk
   * @param mb: corresponding memory block
   */
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  virtual void pushDataBlock(MemBlock *mb);
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  /**
   * Destructor (also waiting for the end of the write operation)
   */
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  virtual ~DiskWriteTask();
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private:
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  void releaseAllBlock();
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  /**
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   * The fifo containing the memory blocks holding data to be written to disk
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   */
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  castor::tape::threading::BlockingQueue<MemBlock *> m_fifo;
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  /** 
   * All we need to know about the file we are currently recalling
   */
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  std::auto_ptr<tape::tapegateway::FileToRecallStruct> m_recallingFile;
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  /**
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   * Reference to the Memory Manager in use
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   */
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  RecallMemoryManager & m_memManager;
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  /**
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   * Mutex forcing serial access to the fifo
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   */
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  castor::tape::threading::Mutex m_producerProtection;
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};
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}}}}