/*
* This file is part of rasdaman community.
*
* Rasdaman community 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 3 of the License, or
* (at your option) any later version.
*
* Rasdaman community 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 rasdaman community.  If not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009 Peter Baumann /
rasdaman GmbH.
*
* For more information please see <http://www.rasdaman.org>
* or contact Peter Baumann via <baumann@rasdaman.com>.
/
/**
 * INCLUDE: akgnet_selector.hh
 *
 * MODULE:  akg network
 * CLASS:   Selector
 *
 * COMMENTS:
 * Namespace akg
 * 
*/

#ifndef AKGNET_SELECTOR
#define AKGNET_SELECTOR

#include "akgnet_common.hh"

namespace akg
  {
  
/** This class envelops the 'select' function of the C-library
*/

/**
  * \ingroup Networks
  */ 
  
class Selector
  {
    public:
      /// Default constructor
      Selector() throw();
      
      /// Sets the timeout interval
      void setTimeout(int sec,int milisec) throw();
      
      /// Disables the timeout
      void disableTimeout() throw();
      
      /// Registers the file descriptor for reading
      void setRead(int fdescr) throw();
      /// Unregisters the file descriptor from reading
      void clearRead(int fdescr) throw();
      
      /// Registers the file descriptor for writing
      void setWrite(int fdescr) throw();
      /// Unregisters the file descriptor from writing
      void clearWrite(int fdescr) throw();
    
      /// The real 'select' operation. The return value is the one of 'select'
      int operator()() throw();
      
      /// Returns true if the file descriptor is registered for read
      bool isRead(int fdescr) throw();
      /// Returns true if the file descriptor is registered for write
      bool isWrite(int fdescr) throw();
      
      /** Closes all file descriptors. Usefull when forking so 
          child processes don't inherit this file descriptors
      */ 
      void closeForcedAllFileDescriptors() throw();
    private:
      fd_set watchReadFdSet;
      fd_set watchWriteFdSet;  
      fd_set watchExceptFdSet; // unused but ...
    
      fd_set resultReadFdSet;
      fd_set resultWriteFdSet; 
      fd_set resultExceptFdSet; // unused but ...
    
      struct timeval tvinit;
      struct timeval tv;
      timeval *tvptr;
      
   };

} // namespace
#endif