1/* Copyright (C) 2007 Google Inc.
2 Copyright (C) 2008 MySQL AB
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; version 2 of the License.
7
8 This program is distributed in the hope that it will be useful,
9 but WITHOUT ANY WARRANTY; without even the implied warranty of
10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 GNU General Public License for more details.
12
13 You should have received a copy of the GNU General Public License
14 along with this program; if not, write to the Free Software
15 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
16
17
18#ifndef SEMISYNC_H
19#define SEMISYNC_H
20
21#include "mysqld.h"
22#include "log_event.h"
23#include "replication.h"
24
25/**
26 This class is used to trace function calls and other process
27 information
28*/
29class Trace {
30public:
31 static const unsigned long k_trace_function;
32 static const unsigned long k_trace_general;
33 static const unsigned long k_trace_detail;
34 static const unsigned long k_trace_net_wait;
35
36 unsigned long m_trace_level; /* the level for tracing */
37
38 Trace()
39 :m_trace_level(0L)
40 {}
41 Trace(unsigned long trace_level)
42 :m_trace_level(trace_level)
43 {}
44};
45
46/**
47 Base class for semi-sync master and slave classes
48*/
49class Repl_semi_sync_base
50 :public Trace {
51public:
52 static const unsigned char k_sync_header[2]; /* three byte packet header */
53
54 /* Constants in network packet header. */
55 static const unsigned char k_packet_magic_num;
56 static const unsigned char k_packet_flag_sync;
57};
58
59/* The layout of a semisync slave reply packet:
60 1 byte for the magic num
61 8 bytes for the binlog positon
62 n bytes for the binlog filename, terminated with a '\0'
63*/
64#define REPLY_MAGIC_NUM_LEN 1
65#define REPLY_BINLOG_POS_LEN 8
66#define REPLY_BINLOG_NAME_LEN (FN_REFLEN + 1)
67#define REPLY_MAGIC_NUM_OFFSET 0
68#define REPLY_BINLOG_POS_OFFSET (REPLY_MAGIC_NUM_OFFSET + REPLY_MAGIC_NUM_LEN)
69#define REPLY_BINLOG_NAME_OFFSET (REPLY_BINLOG_POS_OFFSET + REPLY_BINLOG_POS_LEN)
70#define REPLY_MESSAGE_MAX_LENGTH \
71 (REPLY_MAGIC_NUM_LEN + REPLY_BINLOG_POS_LEN + REPLY_BINLOG_NAME_LEN)
72
73#endif /* SEMISYNC_H */
74