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Add cache expiration. Cache requests for non-existant options.

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git-svn-id: http://svn.automattic.com/wordpress/trunk@3021 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
ryan 2005-11-09 11:10:34 +00:00
parent a656505563
commit 6f54ba207a
1 changed files with 44 additions and 9 deletions
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53
wp-includes/cache.php
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@ -51,12 +51,14 @@ define('CACHE_SERIAL_FOOTER', "\n?".">");
class WP_Object_Cache {
var $cache_dir;
var $cache_enabled = false;
var $expiration_time = 86400;
var $use_flock = false;
var $flock_filename = 'wp_object_cache.lock';
var $sem_id = 5454;
var $mutex;
var $cache = array ();
var $dirty_objects = array ();
var $non_existant_objects = array();
var $global_groups = array('users', 'usermeta');
var $blog_id;
var $cold_cache_hits = 0;
@ -67,7 +69,7 @@ class WP_Object_Cache {
if ( empty($group) )
$group = 'default';
if (isset ($this->cache[$group][$id]))
if ( false !== $this->get($id, $group, false) )
return false;
return $this->set($id, $data, $group, $expire);
@ -77,23 +79,28 @@ class WP_Object_Cache {
if ( empty($group) )
$group = 'default';
if (!isset ($this->cache[$group][$id]))
if ( false === $this->get($id, $group, false) )
return false;
unset ($this->cache[$group][$id]);
$this->non_existant_objects[$group][$id] = true;
$this->dirty_objects[$group][] = $id;
return true;
}
function get($id, $group = 'default') {
function get($id, $group = 'default', $count_hits = true) {
if ( empty($group) )
$group = 'default';
if (isset ($this->cache[$group][$id])) {
$this->warm_cache_hits += 1;
if ( $count_hits )
$this->warm_cache_hits += 1;
return $this->cache[$group][$id];
}
if ( isset($this->non_existant_objects[$group][$id]) )
return false;
// If caching is not enabled, we have to fall back to pulling from the DB.
if (!$this->cache_enabled) {
if (!isset ($this->cache[$group]))
@ -104,18 +111,31 @@ class WP_Object_Cache {
return $this->cache[$group][$id];
}
$this->non_existant_objects[$group][$id] = true;
$this->cache_misses += 1;
return false;
}
$cache_file = $this->cache_dir . $this->get_group_dir($group) . "/" . md5($id . DB_PASSWORD) . '.php';
if (!file_exists($cache_file)) {
$this->non_existant_objects[$group][$id] = true;
$this->cache_misses += 1;
return false;
}
// If the object has expired, remove it from the cache and return false to force
// a refresh.
$now = time();
if ( (filemtime($cache_file) + $this->expiration_time) <= $now ) {
$this->cache_misses += 1;
$this->delete($id, $group);
return false;
}
$this->cache[$group][$id] = unserialize(substr(@ file_get_contents($cache_file), strlen(CACHE_SERIAL_HEADER), -strlen(CACHE_SERIAL_FOOTER)));
if ( false === $this->cache[$group][$id])
$this->cache[$group][$id] = '';
$this->cold_cache_hits += 1;
return $this->cache[$group][$id];
}
@ -182,7 +202,7 @@ class WP_Object_Cache {
if ( empty($group) )
$group = 'default';
if (!isset ($this->cache[$group][$id]))
if ( false === $this->get($id, $group, false) )
return false;
return $this->set($id, $data, $group, $expire);
@ -192,11 +212,16 @@ class WP_Object_Cache {
if ( empty($group) )
$group = 'default';
if ( NULL == $data)
$data = '';
$this->cache[$group][$id] = $data;
unset($this->non_existant_objects[$group][$id]);
$this->dirty_objects[$group][] = $id;
return true;
}
function save() {
//$this->stats();
@ -238,9 +263,16 @@ class WP_Object_Cache {
$ids = array_unique($ids);
foreach ($ids as $id) {
// TODO: If the id is no longer in the cache, it was deleted and
// the file should be removed.
$cache_file = $group_dir . md5($id . DB_PASSWORD) . '.php';
// Remove the cache file if the key is not set.
if ( ! isset($this->cache[$group][$id]) ) {
echo "Deleting $group $id<br/>";
if ( file_exists($cache_file) )
unlink($cache_file);
continue;
}
$temp_file = tempnam($group_dir, 'tmp');
$serial = CACHE_SERIAL_HEADER . serialize($this->cache[$group][$id]) . CACHE_SERIAL_FOOTER;
$fd = fopen($temp_file, 'w');
@ -302,7 +334,10 @@ class WP_Object_Cache {
} else if (is_writable(ABSPATH.'wp-content')) {
$this->cache_enabled = true;
}
if ( defined('CACHE_EXPIRATION_TIME') )
$this->expiration_time = CACHE_EXPIRATION_TIME;
$this->blog_id = md5($blog_id);
}
}