name : semisync_slave.h /* Copyright (c) 2006 MySQL AB, 2009 Sun Microsystems, Inc. Use is subject to license terms. 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 SEMISYNC_SLAVE_H #define SEMISYNC_SLAVE_H #include "semisync.h" #include "my_global.h" #include "sql_priv.h" #include "rpl_mi.h" #include "mysql.h" #include <sql_common.h> class Master_info; /** The extension class for the slave of semi-synchronous replication */ class Repl_semi_sync_slave :public Repl_semi_sync_base { public: Repl_semi_sync_slave() :m_slave_enabled(false) {} ~Repl_semi_sync_slave() = default; void set_trace_level(unsigned long trace_level) { m_trace_level = trace_level; } /* Initialize this class after MySQL parameters are initialized. this * function should be called once at bootstrap time. */ int init_object(); inline bool get_slave_enabled() { return m_slave_enabled; } void set_slave_enabled(bool enabled) { m_slave_enabled = enabled; } inline bool is_delay_master(){ return m_delay_master; } void set_delay_master(bool enabled) { m_delay_master = enabled; } void set_kill_conn_timeout(unsigned int timeout) { m_kill_conn_timeout = timeout; } /* A slave reads the semi-sync packet header and separate the metadata * from the payload data. * * Input: * header - (IN) packet header pointer * total_len - (IN) total packet length: metadata + payload * semi_flags - (IN) store flags: SEMI_SYNC_SLAVE_DELAY_SYNC and SEMI_SYNC_NEED_ACK * payload - (IN) payload: the replication event * payload_len - (IN) payload length * * Return: * 0: success; non-zero: error */ int slave_read_sync_header(const uchar *header, unsigned long total_len, int *semi_flags, const uchar **payload, unsigned long *payload_len); /* A slave replies to the master indicating its replication process. It * indicates that the slave has received all events before the specified * binlog position. */ int slave_reply(Master_info* mi); void slave_start(Master_info *mi); void slave_stop(Master_info *mi); void slave_reconnect(Master_info *mi); int request_transmit(Master_info *mi); void kill_connection(MYSQL *mysql); private: /* True when init_object has been called */ bool m_init_done; bool m_slave_enabled; /* semi-sync is enabled on the slave */ bool m_delay_master; unsigned int m_kill_conn_timeout; }; /* System and status variables for the slave component */ extern my_bool global_rpl_semi_sync_slave_enabled; extern ulong rpl_semi_sync_slave_trace_level; extern Repl_semi_sync_slave repl_semisync_slave; extern char rpl_semi_sync_slave_delay_master; extern unsigned int rpl_semi_sync_slave_kill_conn_timeout; extern unsigned long long rpl_semi_sync_slave_send_ack; extern int rpl_semi_sync_enabled(THD *thd, SHOW_VAR *var, void *buff, system_status_var *status_var, enum_var_type scope); #endif /* SEMISYNC_SLAVE_H */