resource_group.h

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/* Copyright (c) 2017, 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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   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
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   the program or referenced in the documentation.
 
   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, version 2.0, for more details.
 
   You should have received a copy of the GNU General Public License
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   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
#ifndef RESOURCEGROUPS_RESOURCE_GROUP_H_
#define RESOURCEGROUPS_RESOURCE_GROUP_H_
 
#include "resource_group_sql_cmd.h"
 
#include <functional>
#include <memory>
#include <mutex>
#include <set>
 
#include "sql/log.h"  // sql_print_warning
#include "sql/resourcegroups/thread_resource_control.h"
 
namespace resourcegroups {
 
/**
  Class that represents an abstraction of the Resource Group.
  It has generic attributes of Resource group name, type,
  active or inactive, a pointer to a Resource control object.
*/
 
class Resource_group {
 public:
  /**
    Construct a Resource_group object.
 
    @param name name of the Resource_group.
    @param type type of the Resource_group.
    @param enabled Check if Resource_group is enabled or not.
  */
 
  Resource_group(const std::string &name, const Type type, bool enabled)
      : m_name(name), m_type(type), m_enabled(enabled) {}
 
  const std::string &name() const { return m_name; }
 
  Type type() const { return m_type; }
 
  bool enabled() const { return m_enabled; }
 
  void set_type(Type type) { m_type = type; }
 
  void set_enabled(bool enabled) { m_enabled = enabled; }
 
  Thread_resource_control *controller() { return &m_thread_resource_control; }
 
  const Thread_resource_control *controller() const {
    return &m_thread_resource_control;
  }
 
  /**
    Check if resource group is associated with threads.
 
    @return true if some threads are mapped with this resource group
            else false.
  */
 
  bool is_bound_to_threads() {
    std::unique_lock<std::mutex> lock(m_set_mutex);
    return !m_pfs_thread_id_set.empty();
  }
 
  /**
    Is pfs thread id already exists in the set.
 
    @param pfs_thread_id  PFS thread id.
 
    @return true if thread id exists in the set else false.
  */
 
  bool is_pfs_thread_id_exists(const ulonglong pfs_thread_id) {
    std::unique_lock<std::mutex> lock(m_set_mutex);
    return m_pfs_thread_id_set.find(pfs_thread_id) != m_pfs_thread_id_set.end();
  }
 
  /**
    Add thread_id to the thread id set associated with this resource group.
 
    @param pfs_thread_id  PFS thread id.
  */
 
  void add_pfs_thread_id(const ulonglong pfs_thread_id) {
    std::unique_lock<std::mutex> lock(m_set_mutex);
    (void)m_pfs_thread_id_set.insert(pfs_thread_id);
  }
 
  /**
    Remove the PFS thread id.
 
    @param pfs_thread_id Remove pfs thread id.
  */
 
  void remove_pfs_thread_id(const ulonglong pfs_thread_id) {
    std::unique_lock<std::mutex> lock(m_set_mutex);
    (void)m_pfs_thread_id_set.erase(pfs_thread_id);
  }
 
  /**
    Clear the thread id set associated with this resource group.
  */
 
  void clear() {
    std::unique_lock<std::mutex> lock(m_set_mutex);
    (void)m_pfs_thread_id_set.clear();
  }
 
  /**
    Apply a control function on threads associated with this resource group.
 
    @param control_func pointer to Control function.
  */
 
  void apply_control_func(std::function<void(ulonglong)> control_func) {
    std::unique_lock<std::mutex> lock(m_set_mutex);
    for (auto pfs_thread_id : m_pfs_thread_id_set) control_func(pfs_thread_id);
  }
 
  ~Resource_group() = default;
 
 private:
  /**
    Name of the resource group.
  */
  std::string m_name;
 
  /**
    Type whether it is user or system resource group.
  */
  Type m_type;
 
  /**
    bool flag whether resource is enabled or disabled.
  */
  bool m_enabled;
 
  /**
    Thread resource controller object.
  */
  Thread_resource_control m_thread_resource_control;
 
  /**
    Threads associated with this resource group.
  */
  std::set<ulonglong> m_pfs_thread_id_set;
 
  /**
    Mutex protecting the resource group set.
  */
  std::mutex m_set_mutex;
 
  /**
    Disable copy construction and assignment.
  */
  Resource_group(const Resource_group &) = delete;
  void operator=(const Resource_group &) = delete;
};
}  // namespace resourcegroups
#endif  // RESOURCEGROUPS_RESOURCE_GROUP_H_