Skip to content
This repository
file 242 lines (227 sloc) 7.871 kb
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242
<?php
/**
* CFileCache class file
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.yiiframework.com/
* @copyright 2008-2013 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/

/**
* CFileCache provides a file-based caching mechanism.
*
* For each data value being cached, CFileCache will use store it in a separate file
* under {@link cachePath} which defaults to 'protected/runtime/cache'.
* CFileCache will perform garbage collection automatically to remove expired cache files.
*
* See {@link CCache} manual for common cache operations that are supported by CFileCache.
*
* @property integer $gCProbability The probability (parts per million) that garbage collection (GC) should be performed
* when storing a piece of data in the cache. Defaults to 100, meaning 0.01% chance.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @package system.caching
*/
class CFileCache extends CCache
{
/**
* @var string the directory to store cache files. Defaults to null, meaning
* using 'protected/runtime/cache' as the directory.
*/
public $cachePath;
/**
* @var string cache file suffix. Defaults to '.bin'.
*/
public $cacheFileSuffix='.bin';
/**
* @var integer the level of sub-directories to store cache files. Defaults to 0,
* meaning no sub-directories. If the system has huge number of cache files (e.g. 10K+),
* you may want to set this value to be 1 or 2 so that the file system is not over burdened.
* The value of this property should not exceed 16 (less than 3 is recommended).
*/
public $directoryLevel=0;
/**
* @var boolean whether cache entry expiration time should be embedded into a physical file.
* Defaults to false meaning that the file modification time will be used to store expire value.
* True value means that first ten bytes of the file would be reserved and used to store expiration time.
* On some systems PHP is not allowed to change file modification time to be in future even with 777
* permissions, so this property could be useful in this case.
* @since 1.1.14
*/
public $embedExpiry=false;

private $_gcProbability=100;
private $_gced=false;

/**
* Initializes this application component.
* This method is required by the {@link IApplicationComponent} interface.
*/
public function init()
{
parent::init();
if($this->cachePath===null)
$this->cachePath=Yii::app()->getRuntimePath().DIRECTORY_SEPARATOR.'cache';
if(!is_dir($this->cachePath))
mkdir($this->cachePath,0777,true);
}

/**
* @return integer the probability (parts per million) that garbage collection (GC) should be performed
* when storing a piece of data in the cache. Defaults to 100, meaning 0.01% chance.
*/
public function getGCProbability()
{
return $this->_gcProbability;
}

/**
* @param integer $value the probability (parts per million) that garbage collection (GC) should be performed
* when storing a piece of data in the cache. Defaults to 100, meaning 0.01% chance.
* This number should be between 0 and 1000000. A value 0 meaning no GC will be performed at all.
*/
public function setGCProbability($value)
{
$value=(int)$value;
if($value<0)
$value=0;
if($value>1000000)
$value=1000000;
$this->_gcProbability=$value;
}

/**
* Deletes all values from cache.
* This is the implementation of the method declared in the parent class.
* @return boolean whether the flush operation was successful.
* @since 1.1.5
*/
protected function flushValues()
{
$this->gc(false);
return true;
}

/**
* Retrieves a value from cache with a specified key.
* This is the implementation of the method declared in the parent class.
* @param string $key a unique key identifying the cached value
* @return string|boolean the value stored in cache, false if the value is not in the cache or expired.
*/
protected function getValue($key)
{
$cacheFile=$this->getCacheFile($key);
if(($time=$this->filemtime($cacheFile))>time())
return @file_get_contents($cacheFile,false,null,$this->embedExpiry ? 10 : -1);
elseif($time>0)
@unlink($cacheFile);
return false;
}

/**
* Stores a value identified by a key in cache.
* This is the implementation of the method declared in the parent class.
*
* @param string $key the key identifying the value to be cached
* @param string $value the value to be cached
* @param integer $expire the number of seconds in which the cached value will expire. 0 means never expire.
* @return boolean true if the value is successfully stored into cache, false otherwise
*/
protected function setValue($key,$value,$expire)
{
if(!$this->_gced && mt_rand(0,1000000)<$this->_gcProbability)
{
$this->gc();
$this->_gced=true;
}

if($expire<=0)
$expire=31536000; // 1 year
$expire+=time();

$cacheFile=$this->getCacheFile($key);
if($this->directoryLevel>0)
@mkdir(dirname($cacheFile),0777,true);
if(@file_put_contents($cacheFile,$this->embedExpiry ? $expire.$value : $value,LOCK_EX)!==false)
{
@chmod($cacheFile,0777);
return $this->embedExpiry ? true : @touch($cacheFile,$expire);
}
else
return false;
}

/**
* Stores a value identified by a key into cache if the cache does not contain this key.
* This is the implementation of the method declared in the parent class.
*
* @param string $key the key identifying the value to be cached
* @param string $value the value to be cached
* @param integer $expire the number of seconds in which the cached value will expire. 0 means never expire.
* @return boolean true if the value is successfully stored into cache, false otherwise
*/
protected function addValue($key,$value,$expire)
{
$cacheFile=$this->getCacheFile($key);
if($this->filemtime($cacheFile)>time())
return false;
return $this->setValue($key,$value,$expire);
}

/**
* Deletes a value with the specified key from cache
* This is the implementation of the method declared in the parent class.
* @param string $key the key of the value to be deleted
* @return boolean if no error happens during deletion
*/
protected function deleteValue($key)
{
$cacheFile=$this->getCacheFile($key);
return @unlink($cacheFile);
}

/**
* Returns the cache file path given the cache key.
* @param string $key cache key
* @return string the cache file path
*/
protected function getCacheFile($key)
{
if($this->directoryLevel>0)
{
$base=$this->cachePath;
for($i=0;$i<$this->directoryLevel;++$i)
{
if(($prefix=substr($key,$i+$i,2))!==false)
$base.=DIRECTORY_SEPARATOR.$prefix;
}
return $base.DIRECTORY_SEPARATOR.$key.$this->cacheFileSuffix;
}
else
return $this->cachePath.DIRECTORY_SEPARATOR.$key.$this->cacheFileSuffix;
}

/**
* Removes expired cache files.
* @param boolean $expiredOnly whether only expired cache files should be removed.
* If false, all cache files under {@link cachePath} will be removed.
* @param string $path the path to clean with. If null, it will be {@link cachePath}.
*/
public function gc($expiredOnly=true,$path=null)
{
if($path===null)
$path=$this->cachePath;
if(($handle=opendir($path))===false)
return;
while(($file=readdir($handle))!==false)
{
if($file[0]==='.')
continue;
$fullPath=$path.DIRECTORY_SEPARATOR.$file;
if(is_dir($fullPath))
$this->gc($expiredOnly,$fullPath);
elseif($expiredOnly && $this->filemtime($fullPath)<time() || !$expiredOnly)
@unlink($fullPath);
}
closedir($handle);
}

/**
* Returns cache file modification time. {@link $embedExpiry} aware.
* @param string $path to the file, modification time to be retrieved from.
* @return integer file modification time.
*/
private function filemtime($path)
{
if($this->embedExpiry)
return (int)@file_get_contents($path,false,null,0,10);
else
return @filemtime($path);
}
}
Something went wrong with that request. Please try again.