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194 lines
6.2 KiB
194 lines
6.2 KiB
/* Copyright (c) 2010, 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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#ifndef RPL_INFO_H
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#define RPL_INFO_H
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#include <sys/types.h>
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#include <atomic>
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#include "my_inttypes.h"
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#include "my_psi_config.h"
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#include "mysql/components/services/mysql_cond_bits.h"
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#include "mysql/components/services/mysql_mutex_bits.h"
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#include "mysql/components/services/psi_mutex_bits.h"
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#include "mysql_com.h" // NAME_LEN
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#include "sql/rpl_info_handler.h" // Rpl_info_handler
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#include "sql/rpl_reporting.h" // Slave_reporting_capability
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class THD;
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#define CHANNEL_NAME_LENGTH NAME_LEN
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class Rpl_info : public Slave_reporting_capability {
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public:
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virtual ~Rpl_info();
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/*
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standard lock acquisition order to avoid deadlocks:
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run_lock, data_lock, relay_log.LOCK_log, relay_log.LOCK_index
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run_lock, sleep_lock
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run_lock, info_thd_lock
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info_thd_lock is to protect operations on info_thd:
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- before *reading* info_thd we must hold *either* info_thd_lock or
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run_lock;
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- before *writing* we must hold *both* run_lock and info_thd_lock.
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*/
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mysql_mutex_t data_lock, run_lock, sleep_lock, info_thd_lock;
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/*
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start_cond is broadcast when SQL thread is started
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stop_cond - when stopped
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data_cond - when data protected by data_lock changes
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sleep_cond - when killed
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'data_cond' is only being used in class Relay_log_info and not in the
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class Master_info. So 'data_cond' could be moved to Relay_log_info.
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*/
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mysql_cond_t data_cond, start_cond, stop_cond, sleep_cond;
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#ifdef HAVE_PSI_INTERFACE
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PSI_mutex_key *key_info_run_lock, *key_info_data_lock, *key_info_sleep_lock,
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*key_info_thd_lock;
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PSI_mutex_key *key_info_data_cond, *key_info_start_cond, *key_info_stop_cond,
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*key_info_sleep_cond;
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#endif
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THD *info_thd;
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bool inited;
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std::atomic<bool> abort_slave;
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std::atomic<uint> slave_running;
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std::atomic<ulong> slave_run_id;
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#ifndef DBUG_OFF
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int events_until_exit;
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#endif
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/**
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Sets the persistency component/handler.
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@param[in] param_handler Pointer to the handler.
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*/
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void set_rpl_info_handler(Rpl_info_handler *param_handler) {
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handler = param_handler;
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}
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/**
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Gets the persistency component/handler.
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@return the handler if there is one.
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*/
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Rpl_info_handler *get_rpl_info_handler() { return (handler); }
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enum_return_check check_info() const { return (handler->check_info()); }
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int remove_info() { return (handler->remove_info()); }
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int clean_info() { return (handler->clean_info()); }
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bool is_transactional() const { return (handler->is_transactional()); }
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bool update_is_transactional() {
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return (handler->update_is_transactional());
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}
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char *get_description_info() const {
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return (handler->get_description_info());
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}
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bool copy_info(Rpl_info_handler *from, Rpl_info_handler *to) {
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if (read_info(from) || write_info(to)) return (true);
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return (false);
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}
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uint get_internal_id() const { return internal_id; }
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char *get_channel() const { return const_cast<char *>(channel); }
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/**
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To search in the slave repositories, each slave info object
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(mi, rli or worker) should use a primary key. This function
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sets the field values of the slave info objects with
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the search information, which is nothing but PK in mysql slave
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info tables.
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Ex: field_value[23]="channel_name" in the master info
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object.
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Currently, used only for TABLE repository.
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*/
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virtual bool set_info_search_keys(Rpl_info_handler *to) = 0;
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protected:
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/**
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Pointer to the repository's handler.
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*/
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Rpl_info_handler *handler;
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/**
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Uniquely and internaly identifies an info entry (.e.g. a row or
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file). This information is completely transparent to users and
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is used only during startup to retrieve information from the
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repositories.
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@todo, This is not anymore required for Master_info and
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Relay_log_info, since Channel can be used to uniquely
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identify this. To preserve backward compatibility,
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we keep this for Master_info and Relay_log_info.
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However, {id, channel} is still required for a worker info.
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*/
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uint internal_id;
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/**
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Every slave info object acts on a particular channel in Multisource
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Replication.
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*/
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char channel[CHANNEL_NAME_LENGTH + 1] = {0};
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Rpl_info(const char *type,
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#ifdef HAVE_PSI_INTERFACE
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PSI_mutex_key *param_key_info_run_lock,
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PSI_mutex_key *param_key_info_data_lock,
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PSI_mutex_key *param_key_info_sleep_lock,
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PSI_mutex_key *param_key_info_thd_lock,
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PSI_mutex_key *param_key_info_data_cond,
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PSI_mutex_key *param_key_info_start_cond,
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PSI_mutex_key *param_key_info_stop_cond,
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PSI_mutex_key *param_key_info_sleep_cond,
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#endif
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uint param_id, const char *param_channel);
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private:
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virtual bool read_info(Rpl_info_handler *from) = 0;
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virtual bool write_info(Rpl_info_handler *to) = 0;
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Rpl_info(const Rpl_info &info);
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Rpl_info &operator=(const Rpl_info &info);
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public:
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/* True when the thread is still running, but started the stop procedure */
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std::atomic<bool> atomic_is_stopping{false};
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};
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#endif /* RPL_INFO_H */
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