source: source/ariba/communication/modules/transport/protlib/queuemanager.cpp@ 4987

/// ----------------------------------------*- mode: C++; -*--

/// @file queuemanager.cpp

/// queuemanager which records queues and message source IDs

/// ----------------------------------------------------------

/// $Id: queuemanager.cpp 2774 2007-08-08 12:32:08Z bless $

/// $HeadURL: https://svn.ipv6.tm.uka.de/nsis/protlib/trunk/src/queuemanager.cpp $

// ===========================================================

//                      

// Copyright (C) 2005-2007, all rights reserved by

// - Institute of Telematics, Universitaet Karlsruhe (TH)

//

// More information and contact:

// https://projekte.tm.uka.de/trac/NSIS

//                      

// This program 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; version 2 of the License

//

// This program 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 this program; if not, write to the Free Software Foundation, Inc.,

// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

//

// ===========================================================

/** @ingroup queuemanager

 *

 */

#include <stdexcept>



#include "queuemanager.h"

#include "logfile.h"



namespace protlib { 



/** @addtogroup queuemanager Queue Manager

 * \ingroup fastqueue

 * @{

 */



using namespace log;



/***** class QueueManagerError *****/



QueueManagerError::QueueManagerError(error_t e) : err(e) {}



const char* QueueManagerError::getstr() const { return errstr[err]; }



const char* const QueueManagerError::errstr[] = {

        "Unable to create QueueManager.",

        "Cannot register FastQueue. No memory or registered queue more than once."

}; // end errstr



/***** class QueueManager *****/



/** Return QueueManager singleton. */

QueueManager* QueueManager::instance() {

        if (!inst) {

                // try to create singleton

                inst = new(nothrow) QueueManager();

                if (!inst) {

                  Log(INFO_LOG,LOG_NORMAL, "QueueManager" ,"Cannot created QueueManager singleton.");

                  throw QueueManagerError(QueueManagerError::ERROR_NO_QUEUE_MANAGER);

                } else {

                  Log(DEBUG_LOG,LOG_NORMAL, "QueueManager", "Just created QueueManager singleton.");

                } // end if not inst

        } // end if not inst

        return inst;

} // end QueueManager



/**

 * Delete the QueueManager singleton object.

 *

 * After a call to clear references to that object become invalid and must

 * be updated by a call to instance().

 */

void QueueManager::clear() {



        if (inst) {

                QueueManager *tmp = inst;

                inst = 0;

                DLog("QueueManager", "Destroying QueueManager singleton ...");

                delete tmp;

        }



        DLog("QueueManager", "The QueueManager singleton has been destroyed");

}





/**

 * Register a queue.

 *

 * This registers a FastQueue for the given message source ID with the

 * QueueManager.

 *

 * The registered queue (and all its entries) is deleted as soon as the

 * QueueManager is deleted. Because of this, a queue may only be registered

 * once.

 *

 * @param fq pointer to an already allocated fastqueue 

 * @param s  message source ID

 */

void QueueManager::register_queue(FastQueue* fq, message::qaddr_t s) {

  pthread_mutex_lock(&mutex); // install_cleanup_mutex_lock(&mutex);

  // expand array if necessary

  if (((uint32)s)>=queue_arr.capacity()) {

    Log(DEBUG_LOG,LOG_NORMAL, "QueueManager", "expanding queue array from " << s << " to " << s+5);

    // get more memory

    queue_arr.reserve(s+5);

    while (queue_arr.size()<queue_arr.capacity()) queue_arr.push_back(NULL);

  } // end get more memory

  

  if (queue_arr[s]) 

  {

    // queue already exists

    Log(ERROR_LOG,LOG_CRIT, "QueueManager", "A queue for " << s << " is already  registered");

    throw QueueManagerError(QueueManagerError::ERROR_REGISTER);

  } // end if queue exists

  else 

  {

    // register queue

    if (fq)

    {

      queue_arr[s] = fq;

    }

    else

    {

      Log(ERROR_LOG,LOG_CRIT, "QueueManager", "Cannot register queue for " << s);

      throw QueueManagerError(QueueManagerError::ERROR_REGISTER);

    }

  } // end else no queue exists

  pthread_mutex_unlock(&mutex); // uninstall_cleanup(1);

} // end register_queue





void 

QueueManager::unregister_queue(message::qaddr_t s) 

{

  pthread_mutex_lock(&mutex); // install_cleanup_mutex_lock(&mutex);

  try {

          queue_arr.at(s) = 0;

  }

  catch ( std::out_of_range ) {

        /*

         * Nothing to do, queue has probably already been unregistered,

         * probably by calling QueueManager::clear().

         */

  }

  pthread_mutex_unlock(&mutex); // uninstall_cleanup(1);

}



FastQueue* QueueManager::get_queue(message::qaddr_t s) const {

        FastQueue* fq = NULL;

        pthread_mutex_lock(&mutex); // install_cleanup_mutex_lock(&mutex);

        if (((uint32)s)<queue_arr.size()) {

                fq = queue_arr[s];

        } else {

                fq = NULL;

        } // end if

        pthread_mutex_unlock(&mutex); // uninstall_cleanup(1);

        return fq;

} // end get



QueueManager* QueueManager::inst = NULL;



/**

 * Constructor.

 */

QueueManager::QueueManager() : queue_arr(QueueManager::INITIAL_ARRAY_SIZE) {

        pthread_mutexattr_t mutex_attr;



        pthread_mutexattr_init(&mutex_attr);



#ifdef _DEBUG

        pthread_mutexattr_settype(&mutex_attr, PTHREAD_MUTEX_ERRORCHECK);

#else

        pthread_mutexattr_settype(&mutex_attr, PTHREAD_MUTEX_NORMAL);

#endif



        pthread_mutex_init(&mutex, &mutex_attr);



        pthread_mutexattr_destroy(&mutex_attr); // doesn't affect mutex

}





/**

 * Destructor.

 *

 * Delete this object and all FastQueue objects that are still registered.

 */

QueueManager::~QueueManager() {



        pthread_mutex_lock(&mutex);



        // count queues which are still registered

        for ( qm_array_it_t i = queue_arr.begin(); i != queue_arr.end(); i++) 

                if ( *i != 0 )

                        WLog("QueueManager",

                                "~QueueManager(): queue " << (*i)->get_name()

                                << " has not been unregistered");



        pthread_mutex_unlock(&mutex);



        pthread_mutex_destroy(&mutex);

}



//@}



} // end namespace protlib