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73 lines
2.2 KiB
C++
73 lines
2.2 KiB
C++
/* Copyright (C) 2007 Google Inc.
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Copyright (C) 2008 MySQL AB
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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 as published by
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the Free Software Foundation; version 2 of the License.
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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 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 02110-1335 USA */
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#ifndef SEMISYNC_H
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#define SEMISYNC_H
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#include "mysqld.h"
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#include "log_event.h"
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#include "replication.h"
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/**
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This class is used to trace function calls and other process
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information
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*/
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class Trace {
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public:
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static const unsigned long k_trace_function;
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static const unsigned long k_trace_general;
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static const unsigned long k_trace_detail;
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static const unsigned long k_trace_net_wait;
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unsigned long m_trace_level; /* the level for tracing */
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Trace()
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:m_trace_level(0L)
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{}
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Trace(unsigned long trace_level)
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:m_trace_level(trace_level)
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{}
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};
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/**
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Base class for semi-sync master and slave classes
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*/
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class Repl_semi_sync_base
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:public Trace {
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public:
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static const unsigned char k_sync_header[2]; /* three byte packet header */
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/* Constants in network packet header. */
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static const unsigned char k_packet_magic_num;
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static const unsigned char k_packet_flag_sync;
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};
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/* The layout of a semisync slave reply packet:
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1 byte for the magic num
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8 bytes for the binlog positon
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n bytes for the binlog filename, terminated with a '\0'
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*/
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#define REPLY_MAGIC_NUM_LEN 1
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#define REPLY_BINLOG_POS_LEN 8
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#define REPLY_BINLOG_NAME_LEN (FN_REFLEN + 1)
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#define REPLY_MAGIC_NUM_OFFSET 0
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#define REPLY_BINLOG_POS_OFFSET (REPLY_MAGIC_NUM_OFFSET + REPLY_MAGIC_NUM_LEN)
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#define REPLY_BINLOG_NAME_OFFSET (REPLY_BINLOG_POS_OFFSET + REPLY_BINLOG_POS_LEN)
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#define REPLY_MESSAGE_MAX_LENGTH \
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(REPLY_MAGIC_NUM_LEN + REPLY_BINLOG_POS_LEN + REPLY_BINLOG_NAME_LEN)
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#endif /* SEMISYNC_H */
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