晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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/* Copyright 2018-2021 Codership Oy <info@codership.com>

   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 St, Fifth Floor, Boston, MA 02110-1301  USA */

#ifndef WSREP_SERVER_STATE_H
#define WSREP_SERVER_STATE_H

/* wsrep-lib */
#include "wsrep/server_state.hpp"
#include "wsrep/provider.hpp"
#include "wsrep/provider_options.hpp"

/* implementation */
#include "wsrep_server_service.h"
#include "wsrep_mutex.h"
#include "wsrep_condition_variable.h"

class Wsrep_server_state : public wsrep::server_state
{
public:
  static void init_once(const std::string& name,
                        const std::string& incoming_address,
                        const std::string& address,
                        const std::string& working_dir,
                        const wsrep::gtid& initial_position,
                        int max_protocol_version);
  static int init_provider(const std::string& provider,
                           const std::string& options);
  static int init_options();
  static void deinit_provider();
  static void destroy();

  static Wsrep_server_state& instance()
  {
    return *m_instance;
  }

  static bool is_inited()
  {
    return (m_instance != NULL);
  }

  static wsrep::provider& get_provider()
  {
    return instance().provider();
  }

  static wsrep::provider_options* get_options()
  {
    return m_options.get();
  }

  static bool has_capability(int capability)
  {
    return (get_provider().capabilities() & capability);
  }
  
  static void init_provider_services();
  static void deinit_provider_services();

  static const wsrep::provider::services& provider_services()
  {
    return m_provider_services;
  }

  static void handle_fatal_signal();

private:
  Wsrep_server_state(const std::string& name,
                     const std::string& incoming_address,
                     const std::string& address,
                     const std::string& working_dir,
                     const wsrep::gtid& initial_position,
                     int max_protocol_version);
  ~Wsrep_server_state();
  Wsrep_mutex m_mutex;
  Wsrep_condition_variable m_cond;
  Wsrep_server_service m_service;
  static wsrep::provider::services m_provider_services;
  static Wsrep_server_state* m_instance;
  static std::unique_ptr<wsrep::provider_options> m_options;
  // Sysvars for provider plugin. We keep these here because
  // they are allocated dynamically and must be freed at some
  // point during shutdown (after the plugin is deinitialized).
  static std::vector<st_mysql_sys_var *> m_sysvars;
};

#endif // WSREP_SERVER_STATE_H