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
|
/* Copyright (C) Olivier Bertrand 2004 - 2012
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/**
@file user_connect.cc
@brief
Implements the user_connect class.
@details
To support multi_threading, each query creates and use a PlugDB "user"
that is a connection with its personnal memory allocation.
@note
*/
/****************************************************************************/
/* Author: Olivier Bertrand -- bertrandop@gmail.com -- 2004-2012 */
/****************************************************************************/
#ifdef USE_PRAGMA_IMPLEMENTATION
#pragma implementation // gcc: Class implementation
#endif
#define DONT_DEFINE_VOID
#define MYSQL_SERVER
#include "sql_class.h"
#undef OFFSET
#define NOPARSE
#include "osutil.h"
#include "global.h"
#include "plgdbsem.h"
#include "user_connect.h"
#include "mycat.h"
extern "C" char plgxini[];
extern int xtrace;
/****************************************************************************/
/* Initialize the user_connect static member. */
/****************************************************************************/
PCONNECT user_connect::to_users= NULL;
/****************************************************************************/
/* CONNECT functions called externally. */
/****************************************************************************/
PGLOBAL CntExit(PGLOBAL g);
/* -------------------------- class user_connect -------------------------- */
/****************************************************************************/
/* Constructor. */
/****************************************************************************/
user_connect::user_connect(THD *thd, const char *dbn)
{
thdp= thd;
next= NULL;
previous= NULL;
g= NULL;
tabp= NULL;
last_query_id= 0;
count= 0;
// Statistics
nrd= fnd= nfd= 0;
bzero((char*) &tb1, sizeof(struct timeb));
bzero((char*) &tb2, sizeof(struct timeb));
} // end of user_connect constructor
/****************************************************************************/
/* Destructor. */
/****************************************************************************/
user_connect::~user_connect()
{
// Terminate CONNECT and Plug-like environment, should return NULL
g= CntExit(g);
} // end of user_connect destructor
/****************************************************************************/
/* Initialization. */
/****************************************************************************/
bool user_connect::user_init(PHC hc)
{
// Initialize Plug-like environment
PACTIVITY ap= NULL;
PDBUSER dup= NULL;
// Areasize= 64M because of VEC tables. Should be parameterisable
g= PlugInit(NULL, 67108864);
// Check whether the initialization is complete
if (!g || !g->Sarea || PlugSubSet(g, g->Sarea, g->Sarea_Size)
|| !(dup= PlgMakeUser(g))) {
if (g)
printf("%s\n", g->Message);
int rc= PlugExit(g);
g= NULL;
free(dup);
return true;
} // endif g->
dup->Catalog= new MYCAT(hc);
ap= new ACTIVITY;
memset(ap, 0, sizeof(ACTIVITY));
strcpy(ap->Ap_Name, "CONNECT");
g->Activityp= ap;
g->Activityp->Aptr= dup;
next= to_users;
to_users= this;
if (next)
next->previous= this;
last_query_id= thdp->query_id;
count= 1;
return false;
} // end of user_init
/****************************************************************************/
/* Check whether we begin a new query and if so cleanup the previous one. */
/****************************************************************************/
bool user_connect::CheckCleanup(void)
{
if (thdp->query_id > last_query_id) {
PlugCleanup(g, true);
PlugSubSet(g, g->Sarea, g->Sarea_Size);
last_query_id= thdp->query_id;
if (xtrace)
printf("=====> Begin new query %d\n", last_query_id);
return true;
} // endif query_id
return false;
} // end of CheckCleanup
|
