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DbSessionObj.cpp

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//====================================================================
//      DbSession object implementation
//--------------------------------------------------------------------
//
//      Package    : System ( The LHCb Offline System)
//
//  Description: Generic data persistency
//
//      Author     : M.Frank
//  History    :
// +---------+----------------------------------------------+---------
// |    Date |                 Comment                      | Who     
// +---------+----------------------------------------------+---------
// | 11/07/99| Initial version                              | MF
// +---------+----------------------------------------------+---------
//====================================================================
#define DBCNV_DBSESSION_CPP

#include "GaudiKernel/System.h"
#include "GaudiKernel/MsgStream.h"

#include "GaudiDb/IOODataBase.h"
#include "GaudiDb/DbFederation.h"
#include "GaudiDb/DbObject.h"

#include "DbSessionObj.h"
#include "DbFederationObj.h"
#include "DbDataBaseObj.h"
#include "DbContainerObj.h"

// Standard Constructor
DbSession::DbSession(IOODataBase* db, IMessageSvc* msg, unsigned char type)  {
  m_mode    = DbOOMs::READ;
  m_type    = type;
  m_info    = 0;
  m_dbOOMs  = db;
  m_msgSvc  = msg;
  if ( 0 == m_dbOOMs )    {
    MsgStream log(m_msgSvc,System::moduleName());
    log << MSG::ERROR
        << System::moduleName() 
        << "--> Access   DbSession    "
        << " Type:" << "UNKNOWN" 
        << " Mode:" << DbOOMs::accessMode(m_mode) 
        << " impossible. Cannot link to implementation."
        << endreq;
    return;
  }
}

// Standard Destructor
DbSession::~DbSession()  {
  clearEntries();
  if ( 0 != m_info ) m_info->release();
}

// Open session
DbResult DbSession::open(DbAccessMode mode)   {
  MsgStream log(m_msgSvc,m_dbOOMs==0 ? System::moduleName() : m_dbOOMs->driver());
  if ( 0 != m_dbOOMs )    {
    m_mode = mode;
    log << MSG::INFO
        << "--> Open     DbSession    "
        << " Type:" << m_dbOOMs->name() 
        << " Mode:" << DbOOMs::accessMode(m_mode) 
        << "  " << m_name
        << endreq;
    if ( 0 == m_info && 0 != m_dbOOMs )    {
      m_info = m_dbOOMs->createSession();
    }
    return m_info ? m_info->open(mode) : DbOOMs::DbError;
  }
  return DbOOMs::DbError;
}

// close session
DbResult DbSession::close()   {
  DbResult result  = (0 == m_info ) ? DbOOMs::DbSuccess : m_info->close();
  MsgStream log(m_msgSvc,m_dbOOMs==0 ? System::moduleName() : m_dbOOMs->driver());
  std::string dbtyp((m_dbOOMs) ? m_dbOOMs->name() : "UNKNOWN");
  log << MSG::INFO
      << "--> Closed   DbSession    " << m_name 
      << " Type:" << dbtyp
      << endreq;
  m_mode = DbOOMs::NOT_OPEN;
  return result;
}

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