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
|
/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008-2009 Sun Microsystems
*
* Authors:
*
* Jay Pipes <joinfu@sun.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
*/
#ifndef DRIZZLED_PLUGIN_APPLIER_H
#define DRIZZLED_PLUGIN_APPLIER_H
/**
* @file Defines the API for an Applier
*
* An Applier applies an event it has received from a Replicator (via
* a replicator's replicate() call, or it has read using a Reader's read()
* call.
*/
/* some forward declarations needed */
namespace drizzled
{
namespace message
{
class Command;
}
}
namespace drizzled
{
namespace plugin
{
/**
* Base class for appliers of Command messages
*/
class Applier
{
public:
Applier() {}
virtual ~Applier() {}
/**
* Apply something to a target.
*
* @note
*
* It is important to note that memory allocation for the
* supplied pointer is not guaranteed after the completion
* of this function -- meaning the caller can dispose of the
* supplied message. Therefore, appliers which are
* implementing an asynchronous replication system must copy
* the supplied message to their own controlled memory storage
* area.
*
* @param Command message to be replicated
*/
virtual void apply(drizzled::message::Command *to_apply)= 0;
/**
* An applier plugin should override this with its
* internal method for determining if it is active or not.
*/
virtual bool isActive() {return false;}
};
} /* end namespace drizzled::plugin */
} /* end namespace drizzled */
#endif /* DRIZZLED_PLUGIN_APPLIER_H */
|