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
|
<?php
/**
* Efficient concatenated text storage.
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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 Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
/**
* Concatenated gzip (CGZ) storage
* Improves compression ratio by concatenating like objects before gzipping
*/
class ConcatenatedGzipHistoryBlob implements HistoryBlob {
/** @var int */
public $mVersion = 0;
/** @var bool */
public $mCompressed = false;
/** @var string[]|string Array if uncompressed, string if compressed */
public $mItems = [];
/** @var string */
public $mDefaultHash = '';
/** @var int */
public $mSize = 0;
/** @var int */
public $mMaxSize = 10000000;
/** @var int */
public $mMaxCount = 100;
public function __construct() {
if ( !function_exists( 'gzdeflate' ) ) {
throw new MWException( "Need zlib support to read or write this "
. "kind of history object (ConcatenatedGzipHistoryBlob)\n" );
}
}
/**
* @param string $text
* @return string
*/
public function addItem( $text ) {
$this->uncompress();
$hash = md5( $text );
if ( !isset( $this->mItems[$hash] ) ) {
$this->mItems[$hash] = $text;
$this->mSize += strlen( $text );
}
return $hash;
}
/**
* @param string $hash
* @return string|false
*/
public function getItem( $hash ) {
$this->uncompress();
if ( array_key_exists( $hash, $this->mItems ) ) {
return $this->mItems[$hash];
} else {
return false;
}
}
/**
* @param string $text
* @return void
*/
public function setText( $text ) {
$this->uncompress();
$this->mDefaultHash = $this->addItem( $text );
}
/**
* @return string|false
*/
public function getText() {
$this->uncompress();
return $this->getItem( $this->mDefaultHash );
}
/**
* Remove an item
*
* @param string $hash
*/
public function removeItem( $hash ) {
$this->mSize -= strlen( $this->mItems[$hash] );
unset( $this->mItems[$hash] );
}
/**
* Compress the bulk data in the object
*/
public function compress() {
if ( !$this->mCompressed ) {
$this->mItems = gzdeflate( serialize( $this->mItems ) );
$this->mCompressed = true;
}
}
/**
* Uncompress bulk data
*/
public function uncompress() {
if ( $this->mCompressed ) {
$this->mItems = unserialize( gzinflate( $this->mItems ) );
$this->mCompressed = false;
}
}
/**
* @return array
*/
public function __sleep() {
$this->compress();
return [ 'mVersion', 'mCompressed', 'mItems', 'mDefaultHash' ];
}
public function __wakeup() {
$this->uncompress();
}
/**
* Helper function for compression jobs
* Returns true until the object is "full" and ready to be committed
*
* @return bool
*/
public function isHappy() {
return $this->mSize < $this->mMaxSize
&& count( $this->mItems ) < $this->mMaxCount;
}
}
// Blobs generated by MediaWiki < 1.5 on PHP 4 were serialized with the
// class name coerced to lowercase. We can improve efficiency by adding
// autoload entries for the lowercase variants of these classes (T166759).
// The code below is never executed, but it is picked up by the AutoloadGenerator
// parser, which scans for class_alias() calls.
/*
class_alias( ConcatenatedGzipHistoryBlob::class, 'concatenatedgziphistoryblob' );
*/
|
