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Cache revisited #1 #2

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git-svn-id: svn+ssh://code.netmonsters.ru/svn/majestic/trunk@93 4cb57b5f-5bbd-dd11-951b-001d605cbbc5
This commit is contained in:
akulikov
2009-06-01 08:09:24 +00:00
parent efa2db60f2
commit c9a3477208
1 changed files with 67 additions and 8 deletions
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75
classes/Cache.class.php
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@ -14,22 +14,61 @@
final class Cache
{
private $cache_file;
private $cache_folder;
private $cache_time;
private $mode = 0777;
private $infofile = '_infofile';
const HASH_ENABLE = true;
function __construct($cache_name, $cache_time)
{
if (!preg_match('/[a-zA-Z0-9_]/', $cache_name)) {
throw new MJException('Wrong cache identifier "'.$cache_name.'". Must use only [a-zA-Z0-9_]');
}
if ($cache_name == $this->infofile) {
throw new MJException('Name "'.$this->infofile.'" is reserved. Try another one.');
}
if ($cache_time == 0) {
throw new MJException('cache_time must be non-zero');
}
if ($cache_time > 86400) {
throw new MJException('cache_time cannot be greater than 86400 sec (24 hours)');
}
if (substr($cache_name, 0, 1) == '_') {
$this->cache_folder = CACHE_PATH;
} else {
$parts = explode('_', $cache_name, 2);
$this->cache_folder = CACHE_PATH.'/'.(isset($parts[1]) ? $parts[0] : '_all');
if (self::HASH_ENABLE) {
$hash = md5($cache_name);
$this->cache_folder .= '/'.substr($hash, 0, 1).'/'.substr($hash, 0, 2);
}
}
$this->cache_file = $this->cache_folder.'/'.$cache_name;
if (!is_writable($this->cache_folder)) {
mkdir($this->cache_folder, $this->mode, true);
}
$this->cache_time = (int) $cache_time;
$this->cache_file = CACHE_PATH.'/'.$cache_name;
}
/**
* Сохраняет кэш в файл
*
* @param string/array $data - строка (либо одномерный массив) сохраняемых данных
* @return boolean - сохранил или нет
*/
function save($data)
{
if ($this->cache_time != 0) {
if ($this->cache_time != 0 && is_writable($this->cache_folder)) {
$this->clearOld(); //очистка старых файлов.
return (bool) file_put_contents($this->cache_file, $data);
}
return false;
@ -42,9 +81,16 @@ final class Cache
*/
function load()
{
return file_get_contents($this->cache_file);
if ($this->cache_time != 0) {
return file_get_contents($this->cache_file);
}
return false;
}
/**
* Принудительно очистить кеш
*
*/
function reset()
{
@unlink($this->cache_file);
@ -57,13 +103,26 @@ final class Cache
*/
function isCached()
{
if (! file_exists($this->cache_file)) {
return false;
if (is_readable($this->cache_file)) {
if ($this->cache_time < 0 || $this->cache_time + filemtime($this->cache_file) > time()) {
return true;
}
$this->reset(); //удалим просроченый файл
}
if ($this->cache_time > 0 && $this->cache_time + filemtime($this->cache_file) < TIME_NOW) {
return false;
return false;
}
/**
* Удаление файлов старше суток
*
*/
function clearOld()
{
$file = CACHE_PATH.'/'.$this->infofile;
if (!file_exists($file) || date('Ymd', filemtime($file)) != date('Ymd')) {
exec('find '.CACHE_PATH.'/ -mtime +1 -delete'); //не удаляет папки сохраняя структуру
touch($file);
}
return true;
}
}