Current File : //usr/include/mysql/server/private/wsrep_high_priority_service.h
/* Copyright 2018 Codership Oy <info@codership.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
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 for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
#ifndef WSREP_HIGH_PRIORITY_SERVICE_H
#define WSREP_HIGH_PRIORITY_SERVICE_H
#include "wsrep/high_priority_service.hpp"
#include "my_global.h"
#include "sql_error.h" /* Diagnostics area */
#include "sql_class.h" /* rpl_group_info */
class THD;
class Relay_log_info;
class Wsrep_server_service;
class Wsrep_high_priority_service :
public wsrep::high_priority_service,
public wsrep::high_priority_context
{
public:
Wsrep_high_priority_service(THD*);
~Wsrep_high_priority_service();
int start_transaction(const wsrep::ws_handle&,
const wsrep::ws_meta&) override;
int next_fragment(const wsrep::ws_meta&) override;
const wsrep::transaction& transaction() const override;
int adopt_transaction(const wsrep::transaction&) override;
int apply_write_set(const wsrep::ws_meta&, const wsrep::const_buffer&,
wsrep::mutable_buffer&) override = 0;
int append_fragment_and_commit(const wsrep::ws_handle&,
const wsrep::ws_meta&,
const wsrep::const_buffer&,
const wsrep::xid&) override;
int remove_fragments(const wsrep::ws_meta&) override;
int commit(const wsrep::ws_handle&, const wsrep::ws_meta&) override;
int rollback(const wsrep::ws_handle&, const wsrep::ws_meta&) override;
int apply_toi(const wsrep::ws_meta&, const wsrep::const_buffer&,
wsrep::mutable_buffer&) override;
void store_globals() override;
void reset_globals() override;
void switch_execution_context(wsrep::high_priority_service&) override;
int log_dummy_write_set(const wsrep::ws_handle&,
const wsrep::ws_meta&,
wsrep::mutable_buffer&) override;
void adopt_apply_error(wsrep::mutable_buffer&) override;
virtual bool check_exit_status() const = 0;
void debug_crash(const char*) override;
protected:
friend Wsrep_server_service;
THD* m_thd;
Relay_log_info* m_rli;
rpl_group_info* m_rgi;
struct shadow
{
ulonglong option_bits;
uint server_status;
struct st_vio* vio;
ulong tx_isolation;
char* db;
size_t db_length;
//struct timeval user_time;
my_hrtime_t user_time;
longlong row_count_func;
bool wsrep_applier;
} m_shadow;
};
class Wsrep_applier_service : public Wsrep_high_priority_service
{
public:
Wsrep_applier_service(THD*);
~Wsrep_applier_service();
int apply_write_set(const wsrep::ws_meta&, const wsrep::const_buffer&,
wsrep::mutable_buffer&) override;
int apply_nbo_begin(const wsrep::ws_meta&, const wsrep::const_buffer& data,
wsrep::mutable_buffer& err) override;
void after_apply() override;
bool is_replaying() const override { return false; }
bool check_exit_status() const override;
};
class Wsrep_replayer_service : public Wsrep_high_priority_service
{
public:
Wsrep_replayer_service(THD* replayer_thd, THD* orig_thd);
~Wsrep_replayer_service();
int apply_write_set(const wsrep::ws_meta&, const wsrep::const_buffer&,
wsrep::mutable_buffer&) override;
int apply_nbo_begin(const wsrep::ws_meta&, const wsrep::const_buffer& data,
wsrep::mutable_buffer& err) override
{
DBUG_ASSERT(0); /* DDL should never cause replaying */
return 0;
}
void after_apply() override { }
bool is_replaying() const override { return true; }
void replay_status(enum wsrep::provider::status status)
{ m_replay_status = status; }
enum wsrep::provider::status replay_status() const
{ return m_replay_status; }
/* Replayer should never be forced to exit */
bool check_exit_status() const override { return false; }
private:
THD* m_orig_thd;
struct da_shadow
{
enum Diagnostics_area::enum_diagnostics_status status;
ulonglong affected_rows;
ulonglong last_insert_id;
char message[MYSQL_ERRMSG_SIZE];
da_shadow()
: status()
, affected_rows()
, last_insert_id()
, message()
{ }
} m_da_shadow;
enum wsrep::provider::status m_replay_status;
};
#endif /* WSREP_HIGH_PRIORITY_SERVICE_H */
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