/*
----
This file is part of SECONDO.

Copyright (C) 2012, University in Hagen, Department of Computer Science,
Database Systems for New Applications.

SECONDO is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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(at your option) any later version.

SECONDO 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 SECONDO; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
----

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[1] Class DServerCmdWorkerCommunication Implementation

\begin{center}
April 2012 Thomas Achmann
\end{center}

[TOC]

0 Description

Implementation of the class ~DServerCmdWorkerCommunication~


1 Preliminaries

1.1 Includes

*/

#include "DServer.h"
#include "DServerCmdWorkerComm.h"
#include "SocketIO.h"

/*
  
2 Implementation

2.1 Method ~bool checkWorkerAvailable~

  * returns true, if worker is running
  
*/

bool 
DServerCmdWorkerCommunication::checkWorkerAvailable() const
{
  if ( m_worker -> getServer() == 0 ||
       !(m_worker -> getServer() -> IsOk()))
    {
      return false;
    }

  return true;
}


/*
2.2 Method ~bool startSocketCommunication~

  * returns true - success

*/
bool
DServerCmdWorkerCommunication::startWorkerStreamCommunication()
{
  if (m_workerIoStrOpen)
    {
      setCmdErrorText("Communication to worker already opened!");
      return false;
    }

  if (m_worker == NULL)
    {
      setCmdErrorText("No worker assigned yet!");
      return false;
    }

  if (m_worker -> getServer() == 0)
    {
      setCmdErrorText("No server assigned yet!");
      return false;
    }

  if (!setStream(m_worker -> getServer() -> GetSocketStream()))
    { 
      setCmdErrorText("Could not initiate communication to worker!");
      return false;
    }

  m_workerIoStrOpen = true;
  return true;
}


/*
2.3  Method ~bool closeWorkerSocketCommunication~

  * returns true - success

*/
bool
DServerCmdWorkerCommunication::closeWorkerStreamCommunication()
{
  return true;

  if (!m_workerIoStrOpen)
    {
      const string errMsg = 
        "Cannot close worker cmd - connection " + 
        m_worker -> getServerHostName() +  ":" +
        int2Str(m_worker -> getServerPort()) + 
        " : no stream opened!";
      setCmdErrorText(errMsg);
      return false;
    }

#ifdef DS_CMD_WORKER_COMM
  cout << "CLOSING WORKER connection "
       << m_worker -> getServerHostName() << ":"
       << m_worker -> getServerPort() << endl;
#endif

  m_worker -> getServer() -> Close();

  return true;
}

/*
Private method ~bool sendSecondoCmdToWorkerThreaded~
sends the command to
 
  * const string[&] inCmd - command string

  * int inFlag - 0:nested list format, 1:regular SOS fromat
  
  * bool useThreads - true: command is started in a separate thread

  * returns: true - success; false - error

*/
bool 
DServerCmdWorkerCommunication::
       sendSecondoCmdToWorkerThreaded(const string& inCmd,
                                      int inFlag,
                                      bool useThreads)
{
#ifdef DS_CMD_WORKER_COMM
  cout << (unsigned long)this << "SecondoCmd:"  
       << inFlag << " - "<< inCmd << " as " << endl;
  if (useThreads)
    cout << " Thread";
  else
    cout << " NO Thread";
  cout << endl;
#endif
  
  bool ret = true;
  if (useThreads)
      {
        DServerCmdWorkerCommunicationThreaded* commThread =
          new DServerCmdWorkerCommunicationThreaded(this, 
                                                    inCmd, 
                                                    inFlag);
        assert (m_exec == NULL);
        m_exec = new ZThread::ThreadedExecutor();
        m_exec -> execute(commThread);
      }
  else
    {
      assert (m_exec == NULL);

      ret = sendSecondoCmd(inFlag, inCmd);
      if (!ret)
        setCmdErrorText("Unable to send the following Secondo Command:\n" + 
                        inCmd);
    }
  
  return ret;
}

/*
3.3 Method ~void run~

*/
void
DServerCmdWorkerCommunicationThreaded::run()
{
  restoreStream(m_caller -> rentStream());
  setStreamOpen();
                  
  bool ret = 
    sendSecondoCmd(m_flag, m_cmd);

  if (ret)
    ret = waitForSecondoResult(m_cmd);

  if (!ret || hasCmdError())
    m_caller -> setCmdErrorText(getCmdErrorText());

  m_caller -> setCmdResult(getCmdResult());
}