ProcessForkerProxySocket.hpp 2.62 KB
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/******************************************************************************
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 *         castor/tape/tapeserver/daemon/ProcessForkerProxySocket.hpp
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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 Steven.Murray@cern.ch
 *****************************************************************************/

#pragma once

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#include "castor/log/Logger.hpp"
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namespace castor     {
namespace tape       {
namespace tapeserver {
namespace daemon     {

/**
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 * Concrete proxy class representing the process forker.
 *
 * This class uses a socket to communicate with the process forker.
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 */
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class ProcessForkerProxySocket {
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public:
  /**
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   * Constructor.
   *
   * This class takes ownership of the specified socket file-descriptor.  The
   * destructor of this class will close it.
   *
   * @param log Object representing the API of the CASTOR logging system.
   * @param socketFd The file-descriptor of the socket to be used to communicate
   * with the process forker.
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   */
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  ProcessForkerProxySocket(log::Logger &log, const int socketFd) throw();
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  /**
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   * Destructor.
   *
   * Closes the file-descriptor of the socket used to communicate with the
   * process forker.
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   */
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  ~ProcessForkerProxySocket() throw();
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  /**
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   * Forks a data-transfer process.
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   */
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  void forkDataTransferSession();
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  /**
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   * Forks a label-session process.
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   */
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  void forkLabelSession();
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  /**
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   * Forks a cleanup-session process.
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   */
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  void forkCleanupSession();

private:
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  /**
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   * Object representing the API of the CASTOR logging system.
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   */
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  log::Logger &m_log;
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  /**
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   * The file-descriptor of the socket to be used to communicate
   * with the process forker.
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   */
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  const int m_socketFd;
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  void writeMsg();

  void writeMsgHeader();

  void writeMsgBody();

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}; // class ProcessForkerProxySocket
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} // namespace daemon
} // namespace tapeserver
} // namespace tape
} // namespace castor