~drizzle-trunk/drizzle/development

/* 

 * Copyright (c) 2009, Padraig O'Sullivan

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 *   * Redistributions of source code must retain the above copyright notice,

 *     this list of conditions and the following disclaimer.

 *   * Redistributions in binary form must reproduce the above copyright notice,

 *     this list of conditions and the following disclaimer in the documentation

 *     and/or other materials provided with the distribution.

 *   * Neither the name of Padraig O'Sullivan nor the names of its contributors

 *     may be used to endorse or promote products derived from this software

 *     without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE

 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF

 * THE POSSIBILITY OF SUCH DAMAGE.

 */

#ifndef PLUGIN_MEMCACHED_STATS_SYSVAR_HOLDER_H

#define PLUGIN_MEMCACHED_STATS_SYSVAR_HOLDER_H

#include <pthread.h>

#include <string>

class SysvarHolder

{

public:

  static SysvarHolder &singleton()

  {

    static SysvarHolder holder;

    return holder;

  }

  void setServersString(const std::string &in_servers)

  {

    servers_string.assign(in_servers);

  }

  void setServersStringVar(const std::string &in_servers)

  {

    pthread_mutex_lock(&mutex);

    servers_string.assign(in_servers);

  }

  void updateServersSysvar(const char **var_ptr)

  {

    *var_ptr= servers_string.c_str();

    pthread_mutex_unlock(&mutex);

  }

  const std::string getServersString() const

  {

    return servers_string;

  }

private:

  pthread_mutex_t mutex;

  std::string servers_string;

  SysvarHolder()

    :

      mutex(),

      servers_string()

  {

    pthread_mutex_init(&mutex, NULL);

  }

  ~SysvarHolder()

  {

    pthread_mutex_destroy(&mutex);

  }

  SysvarHolder(const SysvarHolder&);

};

#endif /* PLUGIN_MEMCACHED_STATS_SYSVAR_HOLDER_H */