connection_pool_component.h

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/*
  Copyright (c) 2021, 2025, Oracle and/or its affiliates.
 
  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License, version 2.0,
  as published by the Free Software Foundation.
 
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  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
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*/
 
#ifndef MYSQLROUTER_CONNECTION_POOL_COMPONENT_INCLUDED
#define MYSQLROUTER_CONNECTION_POOL_COMPONENT_INCLUDED
 
#include <memory>  // shared_ptr
#include <mutex>
#include <string>
#include <unordered_map>
#include <vector>
 
#include "mysqlrouter/connection_pool_export.h"
 
class ConnectionPool;
 
class CONNECTION_POOL_EXPORT ConnectionPoolComponent {
 public:
  static ConnectionPoolComponent &get_instance();
 
  using key_type = std::string;
 
  // disable copy, as we are a single-instance
  ConnectionPoolComponent(ConnectionPoolComponent const &) = delete;
  void operator=(ConnectionPoolComponent const &) = delete;
 
  // no move either
  ConnectionPoolComponent(ConnectionPoolComponent &&) = delete;
  void operator=(ConnectionPoolComponent &&) = delete;
 
  template <class... Args>
  void emplace(Args &&...args) {
    pools_.emplace(std::forward<Args>(args)...);
  }
 
  void erase(const key_type &name);
 
  void clear();
 
  std::shared_ptr<ConnectionPool> get(const key_type &name);
 
  std::vector<std::string> pool_names() const;
 
  static std::string default_pool_name();
 
 private:
  ConnectionPoolComponent() = default;
 
  std::unordered_map<key_type, std::shared_ptr<ConnectionPool>> pools_;
};
 
#endif