EmptyDriveProbe.hpp 3.07 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 "common/log/LogContext.hpp"
#include "common/log/Logger.hpp"
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#include "castor/tape/tapeserver/drive/DriveInterface.hpp"
#include "castor/tape/tapeserver/file/Structures.hpp"
#include "castor/tape/tapeserver/SCSI/Device.hpp"
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#include "castor/tape/tapeserver/system/Wrapper.hpp"
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#include "mediachanger/MediaChangerFacade.hpp"
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#include <memory>

namespace castor {
namespace tape {
namespace tapeserver {
namespace daemon {
  /**
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   * Class responsible for probing a tape drive to see if it empty and
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   * accessible.
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   */
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  class EmptyDriveProbe {
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  public:
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    /**
     * Constructor
     * 
     * @param log Object representing the API to the CASTOR logging system.
     * @param driveConfig Configuration of the tape drive to be probed.
     * @param sysWrapper Object representing the operating system.
     */
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    EmptyDriveProbe(
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      cta::log::Logger &log,
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      const cta::tape::daemon::TpconfigLine &driveConfig,
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      System::virtualWrapper &sysWrapper);
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    /** 
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     * Probes the tape drive to determine whether it is empty and accessible.
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     *
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     * @return True if the drive is empty and accessible.
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     */
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    bool driveIsEmpty() throw();
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  private:

    /**
     * The logging object     
     */
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    cta::log::Logger &m_log;
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    /**
     * The configuration of the tape drive to be probed.
     */
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    const cta::tape::daemon::TpconfigLine m_driveConfig;
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    /**
     * The system wrapper used to find the device and instantiate the drive object
     */
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    System::virtualWrapper &m_sysWrapper;
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    /** 
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     * Probes the tape drive to determine whether it is empty and accessible.
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     *
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     * @return True if the drive is empty and accessible.
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     */
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    bool exceptionThrowingDriveIsEmpty();
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    /**
     * Creates and returns the object that represents the tape drive to be
     * probed.
     *
     * @return The tape drive.
     */
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    std::unique_ptr<drive::DriveInterface> createDrive();
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  }; // class EmptyDriveProbe
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} // namespace daemon
} // namespace tapeserver
} // namespace tape
} // namespace castor