1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
|
/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008-2009 Sun Microsystems
* Copyright (c) 2009-2010 Jay Pipes <jaypipes@gmail.com>
*
* Authors:
*
* Jay Pipes <jaypipes@gmail.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
*/
/**
* @file Server-side utility which is responsible for managing the
* communication between the kernel and the replication plugins:
*
* - TransactionReplicator
* - TransactionApplier
* - Publisher
* - Subscriber
*
* ReplicationServices is a bridge between replication modules and the kernel,
* and its primary function is to */
#include "config.h"
#include "drizzled/replication_services.h"
#include "drizzled/plugin/transaction_replicator.h"
#include "drizzled/plugin/transaction_applier.h"
#include "drizzled/message/transaction.pb.h"
#include "drizzled/message/table.pb.h"
#include "drizzled/message/statement_transform.h"
#include "drizzled/gettext.h"
#include "drizzled/session.h"
#include "drizzled/error.h"
#include <vector>
using namespace std;
namespace drizzled
{
ReplicationServices::ReplicationServices()
{
is_active= false;
}
void ReplicationServices::evaluateActivePlugins()
{
/*
* We loop through replicators and appliers, evaluating
* whether or not there is at least one active replicator
* and one active applier. If not, we set is_active
* to false.
*/
bool tmp_is_active= false;
if (replicators.empty() || appliers.empty())
{
is_active= false;
return;
}
/*
* Determine if any remaining replicators and if those
* replicators are active...if not, set is_active
* to false
*/
for (Replicators::iterator repl_iter= replicators.begin();
repl_iter != replicators.end();
++repl_iter)
{
if ((*repl_iter)->isEnabled())
{
tmp_is_active= true;
break;
}
}
if (! tmp_is_active)
{
/* No active replicators. Set is_active to false and exit. */
is_active= false;
return;
}
/*
* OK, we know there's at least one active replicator.
*
* Now determine if any remaining replicators and if those
* replicators are active...if not, set is_active
* to false
*/
for (Appliers::iterator appl_iter= appliers.begin();
appl_iter != appliers.end();
++appl_iter)
{
if ((*appl_iter)->isEnabled())
{
is_active= true;
return;
}
}
/* If we get here, there are no active appliers */
is_active= false;
}
void ReplicationServices::attachReplicator(plugin::TransactionReplicator *in_replicator)
{
replicators.push_back(in_replicator);
evaluateActivePlugins();
}
void ReplicationServices::detachReplicator(plugin::TransactionReplicator *in_replicator)
{
replicators.erase(std::find(replicators.begin(), replicators.end(), in_replicator));
evaluateActivePlugins();
}
void ReplicationServices::attachApplier(plugin::TransactionApplier *in_applier)
{
appliers.push_back(in_applier);
evaluateActivePlugins();
}
void ReplicationServices::detachApplier(plugin::TransactionApplier *in_applier)
{
appliers.erase(std::find(appliers.begin(), appliers.end(), in_applier));
evaluateActivePlugins();
}
bool ReplicationServices::isActive() const
{
return is_active;
}
void ReplicationServices::pushTransactionMessage(message::Transaction &to_push)
{
vector<plugin::TransactionReplicator *>::iterator repl_iter= replicators.begin();
vector<plugin::TransactionApplier *>::iterator appl_start_iter, appl_iter;
appl_start_iter= appliers.begin();
plugin::TransactionReplicator *cur_repl;
plugin::TransactionApplier *cur_appl;
while (repl_iter != replicators.end())
{
cur_repl= *repl_iter;
if (! cur_repl->isEnabled())
{
++repl_iter;
continue;
}
appl_iter= appl_start_iter;
while (appl_iter != appliers.end())
{
cur_appl= *appl_iter;
if (! cur_appl->isEnabled())
{
++appl_iter;
continue;
}
cur_repl->replicate(cur_appl, to_push);
/*
* We update the timestamp for the last applied Transaction so that
* publisher plugins can ask the replication services when the
* last known applied Transaction was using the getLastAppliedTimestamp()
* method.
*/
last_applied_timestamp.fetch_and_store(to_push.transaction_context().end_timestamp());
++appl_iter;
}
++repl_iter;
}
}
} /* namespace drizzled */
|