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144 lines
3.9 KiB
144 lines
3.9 KiB
/* Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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/* Internals */
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#ifndef AUTH_UTILITY_INCLUDED
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#define AUTH_UTILITY_INCLUDED
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#include "my_alloc.h"
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#include "mysql/psi/mysql_rwlock.h"
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#include "rwlock_scoped_lock.h"
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#include <map>
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/**
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Class to manage MEM_ROOT. It either accepts and initialized MEM_ROOT
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or initializes a new one and controls its lifespan.
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*/
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class Mem_root_base {
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public:
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explicit Mem_root_base(MEM_ROOT *mem_root);
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Mem_root_base(const Mem_root_base &) = delete;
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Mem_root_base &operator=(const Mem_root_base &) = delete;
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~Mem_root_base();
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MEM_ROOT *get_mem_root() const;
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protected:
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MEM_ROOT *m_mem_root;
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MEM_ROOT m_internal_mem_root;
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private:
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Mem_root_base();
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bool m_inited;
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};
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/**
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Return MEM_ROOT handle.
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*/
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inline MEM_ROOT *Mem_root_base::get_mem_root() const { return m_mem_root; }
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/**
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Map with RWLock protections
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*/
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template <typename K, typename V>
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class Map_with_rw_lock {
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public:
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Map_with_rw_lock(PSI_rwlock_key key) { mysql_rwlock_init(key, &m_lock); }
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Map_with_rw_lock(const Map_with_rw_lock &) = delete;
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Map_with_rw_lock(Map_with_rw_lock &&) = delete;
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Map_with_rw_lock &operator=(const Map_with_rw_lock &) = delete;
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Map_with_rw_lock &operator=(Map_with_rw_lock &&) = delete;
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~Map_with_rw_lock() {
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m_map.clear();
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mysql_rwlock_destroy(&m_lock);
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}
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/**
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Search an entry
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@param [in] key Key
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@param [out] value Value
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@returns status of search
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@retval false Entry not found
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@retval true Entry found. Check value.
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*/
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bool find(const K &key, V &value) {
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rwlock_scoped_lock rdlock(&m_lock, false, __FILE__, __LINE__);
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const auto search_itr = m_map.find(key);
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if (search_itr != m_map.end()) {
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value = search_itr->second;
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return true;
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}
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return false;
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}
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/**
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Insert an entry
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@param [in] key Key
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@param [in] value Value
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@returns status of insertion
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@retval false Error
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@retval true Success
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*/
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bool insert(K key, V value) {
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rwlock_scoped_lock wrlock(&m_lock, true, __FILE__, __LINE__);
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auto returns = m_map.insert(std::make_pair(key, value));
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return returns.second;
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}
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/**
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Delete an entry
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@param [in] key Key to the element to be erased
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*/
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void erase(K key) {
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rwlock_scoped_lock wrlock(&m_lock, true, __FILE__, __LINE__);
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m_map.erase(key);
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}
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/**
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Check limit and clear if needed
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@param [in] size Limit to check against
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*/
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void clear_if_greater(size_t size) {
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rwlock_scoped_lock wrlock(&m_lock, true, __FILE__, __LINE__);
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if (m_map.size() >= size) m_map.clear();
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}
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/** Get the size of the map */
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size_t size() {
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rwlock_scoped_lock rdlock(&m_lock, false, __FILE__, __LINE__);
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return m_map.size();
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}
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private:
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/** Map */
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std::map<K, V> m_map;
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/** Lock to protect m_map */
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mysql_rwlock_t m_lock;
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};
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#endif /* AUTH_UTILITY_INCLUDED */
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