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+/* 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();
+
+ bool get_slave_enabled() {
+ return m_slave_enabled;
+ }
+
+ void set_slave_enabled(bool enabled) {
+ m_slave_enabled = enabled;
+ }
+
+ 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);
+ int slave_start(Master_info *mi);
+ int slave_stop(Master_info *mi);
+ int request_transmit(Master_info*);
+ void kill_connection(MYSQL *mysql);
+ int reset_slave(Master_info *mi);
+
+private:
+ /* True when init_object has been called */
+ bool m_init_done;
+ bool m_slave_enabled; /* semi-sycn 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 rpl_semi_sync_slave_enabled;
+extern my_bool rpl_semi_sync_slave_status;
+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;
+
+#endif /* SEMISYNC_SLAVE_H */