IoSvc.cxx

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/*
  Copyright (C) 2002-2024 CERN for the benefit of the ATLAS collaboration
*/
 
// IoSvc.cxx 
// Implementation file for class IoSvc
// Author: S.Binet<binet@cern.ch>
 
// AthenaServices includes
#include "IoSvc.h"
 
// STL includes
#include <limits>
 
// FrameWork includes
#include "Gaudi/Property.h"
 
 
typedef IIoSvc::Fd Fd;
typedef IIoSvc::IoType IoType;

// Public methods: 
 
// Constructors
IoSvc::IoSvc( const std::string& name, 
              ISvcLocator* pSvcLocator ) : 
  base_class( name, pSvcLocator ),
  m_fds(),
  m_last_fd(3) // 1==cout, 2==cerr, 3==clog
{
  //
  // Property declaration
  // 
  //declareProperty( "Property", m_nProperty );
 
}
 
// Destructor
IoSvc::~IoSvc()
{}
 
// Athena Service's Hooks
StatusCode IoSvc::initialize()
{
  ATH_MSG_INFO ("Initializing " << name() << "...");
 
  return StatusCode::SUCCESS;
}
 
StatusCode IoSvc::finalize()
{
  ATH_MSG_INFO ("Finalizing " << name() << "...");
 
  return StatusCode::SUCCESS;
}

// Const methods: 

bool 
IoSvc::has_fd(Fd fd) const
{
  return m_fds.find(fd) != m_fds.end();
}

Fd 
IoSvc::fd(const std::string& fname) const
{
  for (FdMap_t::const_iterator 
         itr = m_fds.begin(),
         iend= m_fds.end();
       itr != iend;
       ++itr) {
    if (itr->second.fname == fname) {
      return itr->first;
    }
  }
  return -1;
}

const std::string& 
IoSvc::fname(Fd fd) const
{
  FdMap_t::const_iterator itr = m_fds.find(fd);
  if (itr != m_fds.end()) {
    return itr->second.fname;
  }
  static const std::string s_empty = "";
  return s_empty;
}

IoType 
IoSvc::mode(Fd fd) const
{
  FdMap_t::const_iterator itr = m_fds.find(fd);
  if (itr != m_fds.end()) {
    return itr->second.mode;
  }
  return IIoSvc::INVALID;
}

Fd 
IoSvc::open(const std::string& fname, IoType mode)
{
  // check this `fname` hasn't been already associated.
  Fd fd = this->fd(fname);
  if (fd == -1) {
    // FIXME: use a recycle bin of fds ?
    if ( m_last_fd == (std::numeric_limits<Fd>::max()-1)) {
      ATH_MSG_ERROR("too many file descriptors opened!");
      return -1;
    }
    fd = ++m_last_fd;
    FdInfos infos = {fname, mode};
    m_fds.insert(std::make_pair(fd, infos));
    return fd;
  }
 
  // check the previous open mode is the same
  if (mode == this->mode(fd)) {
    return fd;
  }
 
  // inconsistency...
  return -1;
}

StatusCode 
IoSvc::close(Fd fd)
{
  FdMap_t::const_iterator itr = m_fds.find(fd);
  if (itr != m_fds.end()) {
    m_fds.erase(itr);
    return StatusCode::SUCCESS;
  }
  return StatusCode::FAILURE;
}

// Protected methods: 

// Const methods: 

// Non-const methods: