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
|
/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Definitions required for Query Cache plugin
*
* Copyright (C) 2008 Sun Microsystems, Toru Maesaka
*
* 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_QUERY_CACHE_H
#define DRIZZLED_PLUGIN_QUERY_CACHE_H
#include "drizzled/plugin/plugin.h"
namespace drizzled
{
class Session;
namespace plugin
{
/*
This is the API that a qcache plugin must implement.
it should implement each of these function pointers.
if a function pointer is NULL (not loaded), that's ok.
Return:
false = success
true = failure
*/
class QueryCache : public Plugin
{
QueryCache();
QueryCache(const QueryCache &);
QueryCache& operator=(const QueryCache &);
public:
explicit QueryCache(std::string name_arg)
: Plugin(name_arg, "QueryCache")
{}
virtual ~QueryCache() {}
/* Lookup the cache and transmit the data back to the client */
virtual bool tryFetchAndSend(Session *session,
bool is_transactional)= 0;
virtual bool set(Session *session, bool is_transactional)= 0;
virtual bool invalidateTable(Session *session, bool is_transactional)= 0;
virtual bool invalidateDb(Session *session, const char *db_name,
bool transactional)= 0;
virtual bool flush(Session *session)= 0;
static bool addPlugin(QueryCache *handler);
static void removePlugin(QueryCache *handler);
/* These are the functions called by the rest of the Drizzle server */
static bool tryFetchAndSendDo(Session *session, bool transactional);
static bool setDo(Session *session, bool transactional);
static bool invalidateTableDo(Session *session, bool transactional);
static bool invalidateDbDo(Session *session, const char *db_name,
bool transactional);
static bool flushDo(Session *session);
};
} /* namespace plugin */
} /* namespace drizzled */
#endif /* DRIZZLED_PLUGIN_QUERY_CACHE_H */
|