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authorrvelices <rv-github@modusoptimus.com>2014-05-11 08:26:41 +0000
committerrvelices <rv-github@modusoptimus.com>2014-05-11 08:26:41 +0000
commitf1f7e5d4ad0d6bb5cbf170063ec7aec2abb3761d (patch)
tree0e83ddba02373679c530f20bf3f7bc2f86fe2bf5 /include
parentb4decbe52f0bb8213c0320e24ff292cd02e5657f (diff)
added a persistent cache mechanism; used so far to cache image ids in flat view mode
git-svn-id: http://piwigo.org/svn/trunk@28432 68402e56-0260-453c-a942-63ccdbb3a9ee
Diffstat (limited to 'include')
-rw-r--r--include/cache.class.php143
-rw-r--r--include/common.inc.php1
-rw-r--r--include/functions.inc.php1
-rw-r--r--include/section_init.inc.php13
4 files changed, 155 insertions, 3 deletions
diff --git a/include/cache.class.php b/include/cache.class.php
new file mode 100644
index 000000000..b1f7dde89
--- /dev/null
+++ b/include/cache.class.php
@@ -0,0 +1,143 @@
+<?php
+// +-----------------------------------------------------------------------+
+// | Piwigo - a PHP based photo gallery |
+// +-----------------------------------------------------------------------+
+// | Copyright(C) 2008-2014 Piwigo Team http://piwigo.org |
+// | Copyright(C) 2003-2008 PhpWebGallery Team http://phpwebgallery.net |
+// | Copyright(C) 2002-2003 Pierrick LE GALL http://le-gall.net/pierrick |
+// +-----------------------------------------------------------------------+
+// | 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 |
+// | |
+// | 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
+// | USA. |
+// +-----------------------------------------------------------------------+
+
+/**
+ Provides a persistent cache mechanism across multiple page loads/sessions etc...
+*/
+abstract class PersistentCache
+{
+ var $default_lifetime = 86400;
+ protected $instance_key = PHPWG_VERSION;
+
+ /**
+ @return a key that can be safely be used with get/set methods
+ */
+ function make_key($key)
+ {
+ if ( is_array($key) )
+ {
+ $key = implode('&', $key);
+ }
+ $key .= $this->instance_key;
+ return md5($key);
+ }
+
+ /**
+ Searches for a key in the persistent cache and fills corresponding value.
+ @param string $key
+ @param out mixed $value
+ @return false if the $key is not found in cache ($value is not modified in this case)
+ */
+ abstract function get($key, &$value);
+
+ /**
+ Sets a key/value pair in the persistent cache.
+ @param string $key - it should be the return value of make_key function
+ @param mixed $value
+ @param int $lifetime
+ @return false on error
+ */
+ abstract function set($key, $value, $lifetime=null);
+
+ /**
+ Purge the persistent cache.
+ @param boolean $all - if false only expired items will be purged
+ */
+ abstract function purge($all);
+}
+
+
+/**
+ Implementation of a persistent cache using files.
+*/
+class PersistentFileCache extends PersistentCache
+{
+ private $dir;
+
+ function __construct()
+ {
+ global $conf;
+ $this->dir = PHPWG_ROOT_PATH.$conf['data_location'].'cache/';
+ }
+
+ function get($key, &$value)
+ {
+ $loaded = @file_get_contents($this->dir.$key.'.cache');
+ if ($loaded !== false && ($loaded=unserialize($loaded)) !== false)
+ {
+ if ($loaded['expire'] > time())
+ {
+ $value = $loaded['data'];
+ return true;
+ }
+ }
+ return false;
+ }
+
+ function set($key, $value, $lifetime=null)
+ {
+ if ($lifetime === null)
+ {
+ $lifetime = $this->default_lifetime;
+ }
+
+ if (rand() % 199 == 0)
+ {
+ $this->purge(false);
+ }
+
+ $serialized = serialize( array(
+ 'expire' => time() + $lifetime,
+ 'data' => $value
+ ));
+
+ if (false === @file_put_contents($this->dir.$key.'.cache', $serialized))
+ {
+ mkgetdir($this->dir, MKGETDIR_DEFAULT&~MKGETDIR_DIE_ON_ERROR);
+ if (false === @file_put_contents($this->dir.$key.'.cache', $serialized))
+ {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ function purge($all)
+ {
+ $files = glob($this->dir.'*.cache');
+ if (empty($files))
+ {
+ return;
+ }
+
+ $limit = time() - $this->default_lifetime;
+ foreach ($files as $file)
+ {
+ if ($all || @filemtime($file) < $limit)
+ @unlink($file);
+ }
+ }
+
+}
+
+?> \ No newline at end of file
diff --git a/include/common.inc.php b/include/common.inc.php
index 03ca26811..3739cfa5f 100644
--- a/include/common.inc.php
+++ b/include/common.inc.php
@@ -103,6 +103,7 @@ if(isset($conf['show_php_errors']) && !empty($conf['show_php_errors']))
include(PHPWG_ROOT_PATH . 'include/constants.php');
include(PHPWG_ROOT_PATH . 'include/functions.inc.php');
+$persistent_cache = new PersistentFileCache();
// Database connection
try
diff --git a/include/functions.inc.php b/include/functions.inc.php
index 195f7f00d..03d6c6b0f 100644
--- a/include/functions.inc.php
+++ b/include/functions.inc.php
@@ -37,6 +37,7 @@ include_once( PHPWG_ROOT_PATH .'include/derivative_params.inc.php');
include_once( PHPWG_ROOT_PATH .'include/derivative_std_params.inc.php');
include_once( PHPWG_ROOT_PATH .'include/derivative.inc.php');
include_once( PHPWG_ROOT_PATH .'include/template.class.php');
+include_once( PHPWG_ROOT_PATH .'include/cache.class.php');
/**
diff --git a/include/section_init.inc.php b/include/section_init.inc.php
index cbc699d45..8ab635875 100644
--- a/include/section_init.inc.php
+++ b/include/section_init.inc.php
@@ -291,6 +291,7 @@ SELECT id
}
else
{
+ $cache_key = $persistent_cache->make_key('all_iids'.$user['id'].$user['cache_update_time'].$conf['order_by']);
unset($page['is_homepage']);
$where_sql = '1=1';
}
@@ -301,8 +302,10 @@ SELECT id
$where_sql = 'category_id = '.$page['category']['id'];
}
- // main query
- $query = '
+ if ( !isset($cache_key) || !$persistent_cache->get($cache_key, $page['items']))
+ {
+ // main query
+ $query = '
SELECT DISTINCT(image_id)
FROM '.IMAGE_CATEGORY_TABLE.'
INNER JOIN '.IMAGES_TABLE.' ON id = image_id
@@ -312,7 +315,11 @@ SELECT DISTINCT(image_id)
'.$conf['order_by'].'
;';
- $page['items'] = query2array($query,null, 'image_id');
+ $page['items'] = query2array($query,null, 'image_id');
+
+ if ( isset($cache_key) )
+ $persistent_cache->set($cache_key, $page['items']);
+ }
}
}
// special sections