public static function getInstance()
{
if (self::$_instance == null) {
self::$_instance = new self();
}
self::$_instance->setCacheSaveFile(TEMP_PATH . '/Cache/Data');
return self::$_instance;
}
/**
* 缓存数据库字段信息
* @access private
* @return array 字段列表
*/
private function _makeCacheTableFields()
{
$cache_key = md5($this->_db_name . $this->_table_name);
$cache = XF_Cache_SECache::getInstance();
if (!is_dir(TEMP_PATH . '/Cache/')) {
XF_File::mkdirs(TEMP_PATH . '/Cache/');
}
$cache->setCacheSaveFile(TEMP_PATH . '/Cache/DatabaseField');
$content = $cache->read($cache_key);
if ($content !== XF_CACHE_EMPTY) {
return $content;
}
//缓存字段
$tmp = $this->getTableSelect()->getFields();
$cache->setCacheTime(60 * 24 * 30)->add($cache_key, $tmp);
return $tmp;
}
/**
* 检测是否存在缓存文件
* @access private
* @return void
*/
private function _checkCacheContent()
{
$key = $this->getCacheSign();
if ($key == '') {
return;
}
//如果没有设置缓存类型，则默认为secache
if ($this->_cache_instance == null) {
$this->_cache_instance = XF_Cache_SECache::getInstance();
}
if ($this->_cache_instance instanceof XF_Cache_SECache) {
$cache_file = TEMP_PATH . '/Cache/ActionViewCache';
if (!is_file($cache_file . '.php')) {
return null;
}
$this->_cache_instance->setCacheSaveFile($cache_file);
}
//是否存强制清除缓存
if (XF_DataPool::getInstance()->get('clearActionCache') === true) {
$this->_cache_instance->remove($key);
return null;
}
$content = $this->_cache_instance->read($key);
if ($content == XF_CACHE_EMPTY) {
return null;
}
//检测布局
preg_match('/<!--Layout:(.*?)-->/', $content, $matches);
if (isset($matches[0])) {
$tmp = explode(',', $matches[1]);
$layoutName = $tmp[0];
$layout = new $layoutName();
$layout->setCacheTime($tmp[1]);
$layout->setCacheType($tmp[2]);
//清除布局标记
$content = str_replace($matches[0], '', $content);
//执行布局对象，并渲染布局模板
if ($layout instanceof XF_View_Layout_Abstract) {
//获取缓存的标题等信息
$this->_checkCacheHtmlTag($content);
$layout->assign('$layoutContent', $content);
$content = $layout->render();
}
}
return $content;
}
