Index: branches/5.1.x/core/kernel/utility/cache.php
===================================================================
--- branches/5.1.x/core/kernel/utility/cache.php (revision 13170)
+++ branches/5.1.x/core/kernel/utility/cache.php (revision 13171)
@@ -1,519 +1,520 @@
<?php
/**
* @version $Id$
* @package In-Portal
* @copyright Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
* @license GNU/GPL
* In-Portal is Open Source software.
* This means that this software may have been modified pursuant
* the GNU General Public License, and as distributed it includes
* or is derivative of works licensed under the GNU General Public License
* or other free or open source software licenses.
* See http://www.in-portal.org/license for copyright notices and details.
*/
defined('FULL_PATH') or die('restricted access!');
/**
* Manager of all implemented caching handlers
*
*/
class kCache extends kBase {
/**
* Object of cache handler
*
* @var FakeCacheHandler
*/
var $_handler = null;
/**
* Part of what we retrieve will be stored locally (per script run) not to bother memcache a lot
*
* @var Array
*/
var $_localStorage = Array ();
/**
* What type of caching is being used
*
* @var int
*/
var $cachingType = CACHING_TYPE_NONE;
/**
* Cache usage statistics (per script run)
*
* @var Array
*/
var $statistics = Array ();
/**
* Debug cache usage
*
* @var bool
*/
var $debugCache = false;
/**
* Displays cache usage statistics
*
* @var bool
*/
var $displayCacheStatistics = false;
function kCache()
{
parent::kBase();
// get cache handler class to use
if (array_key_exists('CacheHandler', $GLOBALS['vars']) && $GLOBALS['vars']['CacheHandler']) {
// for advanced users, who want to save one SQL on each page load
$handler_class = $GLOBALS['vars']['CacheHandler'] . 'CacheHandler';
}
else {
$handler_class = $this->Application->ConfigValue('CacheHandler') . 'CacheHandler';
}
// defined cache handler doen't exist -> use default
if (!class_exists($handler_class)) {
$handler_class = 'FakeCacheHandler';
}
$handler = new $handler_class();
if (!$handler->isWorking()) {
// defined cache handler is not working -> use default
trigger_error('Failed to initialize "<strong>' . $handler_class . '</strong>" caching handler.', E_USER_WARNING);
$handler = new FakeCacheHandler();
}
elseif ($this->Application->isDebugMode() && ($handler->cachingType == CACHING_TYPE_MEMORY)) {
$this->Application->Debugger->appendHTML('Memory Caching: "<strong>' . $handler_class . '</strong>"');
}
$this->_handler =& $handler;
$this->cachingType = $handler->cachingType;
$this->debugCache = $handler->cachingType == CACHING_TYPE_MEMORY && $this->Application->isDebugMode();
$this->displayCacheStatistics = defined('DBG_CACHE') && DBG_CACHE && $this->Application->isDebugMode();
}
/**
* Returns caching type of current storage engine
*
* @return int
*/
function getCachingType()
{
return $this->cachingType;
}
/**
* Stores value to cache
*
* @param string $name
* @param mixed $value
* @param int $expires cache record expiration time in seconds
*/
function setCache($name, $value, $expiration)
{
$name = $this->prepareKeyName($name);
$this->_localStorage[$name] = $value;
return $this->_handler->set($name, $value, $expiration);
}
/**
* Returns value from cache
*
* @param string $name
* @param bool $store_locally store data locally after retrieved
* @param bool $replace_serials
* @return mixed
*/
function getCache($name, $store_locally = true, $replace_serials = true)
{
$name = $this->prepareKeyName($name, $replace_serials);
if ($store_locally) {
if (array_key_exists($name, $this->_localStorage)) {
if ($this->displayCacheStatistics) {
$this->setStatistics($name, $this->_localStorage[$name]);
}
return $this->_localStorage[$name];
}
}
$res = $this->_handler->get($name);
if ($replace_serials && $this->debugCache) {
// don't display subsequent serial cache retrievals (ones, that are part of keys)
if (is_array($res)) {
$this->Application->Debugger->appendHTML('Restoring key "' . $name . '". Type: ' . gettype($res) . '.');
}
else {
$res_display = strip_tags($res);
if (strlen($res_display) > 200) {
$res_display = substr($res_display, 0, 50) . ' ...';
}
$this->Application->Debugger->appendHTML('Restoring key "' . $name . '" resulted [' . $res_display . ']');
}
}
if ($store_locally && ($res !== false)) {
$this->_localStorage[$name] = $res;
if ($this->displayCacheStatistics) {
$this->setStatistics($name, $res);
}
}
return $res;
}
/**
* Deletes value from cache
*
* @param string $name
* @return mixed
*/
function delete($name)
{
$name = $this->prepareKeyName($name);
unset($this->_localStorage[$name]);
return $this->_handler->delete($name);
}
/**
* Reset's all memory cache at once
*/
function reset()
{
// don't check for enabled, because we maybe need to reset cache anyway
if ($this->cachingType == CACHING_TYPE_TEMPORARY) {
return ;
}
$site_key = $this->_cachePrefix(true);
$this->_handler->set($site_key, $this->_handler->get($site_key) + 1);
}
/**
* Replaces serials and adds unique site prefix to cache variable name
*
* @param string $name
* @param bool $replace_serials
* @return string
*/
function prepareKeyName($name, $replace_serials = true)
{
if ($this->cachingType == CACHING_TYPE_TEMPORARY) {
return $name;
}
// replace serials in key name
if ($replace_serials && preg_match_all('/\[%(.*?)%\]/', $name, $regs)) {
// [%LangSerial%] - prefix-wide serial in case of any change in "lang" prefix
// [%LangIDSerial:5%] - one id-wide serial in case of data, associated with given id was changed
// [%CiIDSerial:ItemResourceId:5%] - foreign key-based serial in case of data, associated with given foreign key was changed
foreach ($regs[1] as $serial_name) {
$name = str_replace('[%' . $serial_name . '%]', '[' . $serial_name . '=' . $this->getCache($serial_name, true, false) . ']', $name);
}
}
// add site-wide prefix to key
return $this->_cachePrefix() . $name;
}
/**
* Returns site-wide caching prefix
*
* @param bool $only_site_key_name
* @return string
*/
function _cachePrefix($only_site_key_name = false)
{
// don't use SERVER_NAME here, because it may be cron, or command line request also
$site_key = 'site_serial:' . crc32(FULL_PATH);
if ($only_site_key_name) {
return $site_key;
}
$site_serial = $this->_handler->get($site_key);
if (!$site_serial) {
$site_serial = 1;
$this->_handler->set($site_key, $site_serial);
}
return "$site_key:$site_serial:";
}
function setStatistics($name, $found)
{
if (strpos($name, ']:') !== false) {
list ($cache_name, $name) = explode(']:', $name, 2);
}
else {
$cache_name = '-';
}
if (!array_key_exists($cache_name, $this->statistics)) {
$this->statistics[$cache_name] = Array ();
}
if (!array_key_exists($name, $this->statistics[$cache_name])) {
$this->statistics[$cache_name][$name] = Array ();
}
$status_key = $found ? 'found' : 'not_found';
if (!isset($this->statistics[$cache_name][$name][$status_key])) {
$this->statistics[$cache_name][$name][$status_key] = 0;
}
$this->statistics[$cache_name][$name][$status_key]++;
}
/**
* Returns storage size in bytes
*
* @return int
*/
function getStorageSize()
{
return strlen( serialize($this->_localStorage) );
}
function printStatistics()
{
$cache_size = $this->getStorageSize();
$this->Application->Debugger->appendHTML('<strong>Cache Size:</strong> ' . formatSize($cache_size) . ' (' . $cache_size . ')');
foreach ($this->statistics as $cache_name => $cache_data) {
foreach ($cache_data as $key => $value) {
if (!array_key_exists('found', $value) || $value['found'] == 1) {
// remove cached records, that were used only 1 or 2 times
unset($this->statistics[$cache_name][$key]);
}
}
}
print_pre($this->statistics, 'Cache Statistics:');
}
}
class FakeCacheHandler {
var $cachingType = CACHING_TYPE_TEMPORARY;
function FakeCacheHandler()
{
}
/**
* Retrieves value from cache
*
* @param string $name
* @return mixed
*/
function get($name)
{
return false;
}
/**
* Stores value in cache
*
* @param string $name
* @param mixed $value
* @param int $expiration
* @return bool
*/
function set($name, $value, $expiration = 0)
{
return true;
}
/**
* Deletes key from cach
*
* @param string $name
* @return bool
*/
function delete($name)
{
return true;
}
/**
* Determines, that cache storage is working fine
*
* @return bool
*/
function isWorking()
{
return true;
}
}
class MemcacheCacheHandler {
var $_enabled = false;
/**
* Memcache connection
*
* @var Memcache
*/
var $_handler = null;
var $cachingType = CACHING_TYPE_MEMORY;
function MemcacheCacheHandler()
{
if (array_key_exists('MemcacheServers', $GLOBALS['vars'])) {
// for advanced users, who want to save one SQL on each page load
$memcached_servers = $GLOBALS['vars']['MemcacheServers'];
}
else {
- $memcached_servers = $this->Application->ConfigValue('MemcacheServers');
+ $application =& kApplication::Instance();
+ $memcached_servers = $application->ConfigValue('MemcacheServers');
}
if ($memcached_servers && class_exists('Memcache')) {
$this->_enabled = true;
$this->_handler = new Memcache();
$servers = explode(';', $memcached_servers);
foreach ($servers as $server) {
list ($server, $port) = strpos($server, ':') !== false ? explode(':', $server, 2) : Array ($server, 11211);
$this->_handler->addServer($server, $port);
}
// verify, that memcache server is working
if (!$this->_handler->set('test', 1)) {
$this->_enabled = false;
}
}
}
/**
* Retrieves value from cache
*
* @param string $name
* @return mixed
*/
function get($name)
{
return $this->_handler->get($name);
}
/**
* Stores value in cache
*
* @param string $name
* @param mixed $value
* @param int $expiration
* @return bool
*/
function set($name, $value, $expiration = 0)
{
// 0 - don't use compression
return $this->_handler->set($name, $value, 0, $expiration);
}
/**
* Deletes key from cache
*
* @param string $name
* @return bool
*/
function delete($name)
{
return $this->_handler->delete($name);
}
/**
* Determines, that cache storage is working fine
*
* @return bool
*/
function isWorking()
{
return $this->_enabled;
}
}
class ApcCacheHandler {
var $_enabled = false;
var $cachingType = CACHING_TYPE_MEMORY;
function ApcCacheHandler()
{
$this->_enabled = function_exists('apc_fetch');
// verify, that apc is working
if ($this->_enabled && !$this->set('test', 1)) {
$this->_enabled = false;
}
}
/**
* Retrieves value from cache
*
* @param string $name
* @return mixed
*/
function get($name)
{
return apc_fetch($name);
}
/**
* Stores value in cache
*
* @param string $name
* @param mixed $value
* @param int $expiration
* @return bool
*/
function set($name, $value, $expiration = 0)
{
return apc_store($name, $value, $expiration);
}
/**
* Deletes key from cache
*
* @param string $name
* @return bool
*/
function delete($name)
{
return apc_delete($name);
}
/**
* Determines, that cache storage is working fine
*
* @return bool
*/
function isWorking()
{
return $this->_enabled;
}
}
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