102 lines
3.6 KiB
C++
102 lines
3.6 KiB
C++
/* Copyright (c) 2020, 2024, Oracle and/or its affiliates.
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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 designed to work 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 either included with
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the program or referenced in the documentation.
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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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#include <atomic>
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#include <functional>
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#include <set>
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#include <string>
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#include <mysql/components/services/mysql_rwlock.h>
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#include <unordered_map>
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#include "cache_allocator.h"
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#include "reference_cache_common.h"
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namespace reference_caching {
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class channel_imp : public Cache_malloced {
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public:
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static channel_imp *create(service_names_set<> &service_names);
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static bool destroy(channel_imp *channel);
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static bool factory_init();
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static bool factory_deinit();
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static bool ignore_list_add(channel_imp *channel,
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std::string service_implementation);
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static bool ignore_list_clear(channel_imp *channel);
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static bool ignore_list_remove(channel_imp *channel,
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std::string service_implementation);
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static void increment_version(channel_imp *channel);
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static bool service_notification(const char **services, unsigned int count,
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bool unload);
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unsigned int version() { return m_version.load(std::memory_order_relaxed); }
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service_names_set<> &get_service_names();
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void ignore_list_copy(
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service_names_set<std::string, std::less<std::string>> &dest_set);
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bool is_alone() { return m_reference_count == 1; }
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channel_imp *ref() {
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m_reference_count.fetch_add(1, std::memory_order_relaxed);
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return this;
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}
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int unref() {
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return m_reference_count.fetch_sub(1, std::memory_order_relaxed);
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}
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~channel_imp();
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protected:
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channel_imp();
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explicit channel_imp(service_names_set<> &service_names);
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private:
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inline void increment_version_no_lock() {
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m_version.fetch_add(1, std::memory_order_relaxed);
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}
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bool ignore_list_add(std::string &service_implementation);
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bool ignore_list_clear();
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bool ignore_list_remove(std::string &service_implementation);
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// disable copy constructors
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channel_imp(const channel_imp &) = delete;
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channel_imp &operator=(const channel_imp &) = delete;
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void initialize_service_counts();
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service_names_set<> m_service_names;
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service_names_set<std::string, std::less<std::string>> m_ignore_list;
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std::atomic<bool> m_has_ignore_list;
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std::atomic<int> m_reference_count;
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std::atomic<unsigned int> m_version;
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mysql_rwlock_t m_lock;
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};
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typedef std::unordered_multimap<
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std::string, channel_imp *, std::hash<std::string>,
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std::equal_to<std::string>,
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Component_malloc_allocator<std::pair<const std::string, channel_imp *>>>
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channel_by_name_hash_t;
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extern channel_by_name_hash_t *channel_by_name_hash;
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extern mysql_rwlock_t LOCK_channels;
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} // namespace reference_caching
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