catalog.h

/* Copyright (c) 2021 OceanBase and/or its affiliates. All rights reserved.
miniob is licensed under Mulan PSL v2.
You can use this software according to the terms and conditions of the Mulan PSL v2.
You may obtain a copy of Mulan PSL v2 at:
         http://license.coscl.org.cn/MulanPSL2
THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
See the Mulan PSL v2 for more details. */
 
#pragma once
#include "common/lang/unordered_map.h"
#include "common/lang/mutex.h"
#include "catalog/table_stats.h"
 
class Catalog
{
 
public:
  Catalog() = default;
 
  ~Catalog() = default;
 
  Catalog(const Catalog &) = delete;
 
  Catalog &operator=(const Catalog &) = delete;
 
  const TableStats &get_table_stats(int table_id);
 
  void update_table_stats(int table_id, const TableStats &table_stats);
 
  static Catalog &get_instance()
  {
    static Catalog instance;
    return instance;
  }
 
private:
  mutex mutex_;
 
  unordered_map<int, TableStats> table_stats_;  
};