source: src/JobMarket/Operations/Servers/CheckAliveWorkerOperation.cpp@ 404d2b

/*
 * Project: JobMarket
 * Description: asynchronous Server/Controller/Client-approach to parallel computing, based on boost::asio
 * Copyright (C)  2012 Frederik Heber. All rights reserved.
 * 
 */

/*
 * CheckAliveWorkerOperation.cpp
 *
 *  Created on: Sep 05, 2012
 *      Author: heber
 */

// include config.h
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

// boost asio needs specific operator new
#include <boost/asio.hpp>

#include "CodePatterns/MemDebug.hpp"

#include "JobMarket/Operations/Servers/CheckAliveWorkerOperation.hpp"

#include <boost/bind.hpp>
#include <iostream>
#include "JobMarket/Connection.hpp" // Must come before boost/serialization headers.
#include "JobMarket/ServerChoices.hpp"
#include "CodePatterns/Info.hpp"
#include "CodePatterns/Log.hpp"

/** Handle connect operation to shutdown scheduler.
 *
 * \param e error code if something went wrong
 * \param endpoint_iterator endpoint of the connection
 */
void CheckAliveWorkerOperation::handle_connect(const boost::system::error_code& e,
    boost::asio::ip::tcp::resolver::iterator endpoint_iterator)
{
  DEBUG_FUNCTION_ENTRYEXIT
  if (!e)
  {
    // The connection::async_write() function will automatically
    // serialize the data structure for us.
    enum ServerChoices choice = CheckAlive;
    connection_.async_write(choice,
      boost::bind(&CheckAliveWorkerOperation::handle_ReceiveAddress, this,
      boost::asio::placeholders::error));
  } else if (endpoint_iterator != boost::asio::ip::tcp::resolver::iterator()) {
    // Try the next endpoint.
    connection_.socket().close();
    boost::asio::ip::tcp::endpoint endpoint = *endpoint_iterator;
    connection_.socket().async_connect(endpoint,
      boost::bind(&CheckAliveWorkerOperation::handle_connect, this,
      boost::asio::placeholders::error, ++endpoint_iterator));
  } else {
    // An error occurred. Log it and return. Since we are not starting a new
    // operation the io_service will run out of work to do and the client will
    // exit.
    ELOG(1, e.message());
    AsyncOperation::handle_FinishOperation(e);
  }
}

/** Handle connect operation to receive address as alive signal.
 *
 * \param e error code if something went wrong
 */
void CheckAliveWorkerOperation::handle_ReceiveAddress(const boost::system::error_code& e)
{
  DEBUG_FUNCTION_ENTRYEXIT
  if (!e)
  {
    // The connection::async_write() function will automatically
    // serialize the data structure for us.
    connection_.async_read(address,
      boost::bind(&CheckAliveWorkerOperation::handle_CheckAddress, this,
      boost::asio::placeholders::error));
  } else {
    // An error occurred. Log it and return. Since we are not starting a new
    // operation the io_service will run out of work to do and the client will
    // exit.
    ELOG(1, e.message());
    AsyncOperation::handle_FinishOperation(e);
  }
}

/** Handle connect operation after received address as alive signal.
 *
 * \param e error code if something went wrong
 */
void CheckAliveWorkerOperation::handle_CheckAddress(const boost::system::error_code& e)
{
  DEBUG_FUNCTION_ENTRYEXIT
  if (!e)
  {
    LOG(1, "INFO: Received address " << address << ".");
    checkAddress(address);
  } else {
    // An error occurred. Log it and return. Since we are not starting a new
    // operation the io_service will run out of work to do and the client will
    // exit.
    ELOG(1, e.message());
  }
  AsyncOperation::handle_FinishOperation(e);
}