diff -r 0d9a58d2c515 -r 0d28b7c10758 web/wp-includes/cache.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/wp-includes/cache.php	Fri Mar 12 13:29:04 2010 +0000
@@ -0,0 +1,452 @@
+<?php
+/**
+ * Object Cache API
+ *
+ * @link http://codex.wordpress.org/Function_Reference/WP_Cache
+ *
+ * @package WordPress
+ * @subpackage Cache
+ */
+
+/**
+ * Adds data to the cache, if the cache key doesn't aleady exist.
+ *
+ * @since 2.0.0
+ * @uses $wp_object_cache Object Cache Class
+ * @see WP_Object_Cache::add()
+ *
+ * @param int|string $key The cache ID to use for retrieval later
+ * @param mixed $data The data to add to the cache store
+ * @param string $flag The group to add the cache to
+ * @param int $expire When the cache data should be expired
+ * @return unknown
+ */
+function wp_cache_add($key, $data, $flag = '', $expire = 0) {
+	global $wp_object_cache;
+
+	return $wp_object_cache->add($key, $data, $flag, $expire);
+}
+
+/**
+ * Closes the cache.
+ *
+ * This function has ceased to do anything since WordPress 2.5. The
+ * functionality was removed along with the rest of the persistant cache. This
+ * does not mean that plugins can't implement this function when they need to
+ * make sure that the cache is cleaned up after WordPress no longer needs it.
+ *
+ * @since 2.0.0
+ *
+ * @return bool Always returns True
+ */
+function wp_cache_close() {
+	return true;
+}
+
+/**
+ * Removes the cache contents matching ID and flag.
+ *
+ * @since 2.0.0
+ * @uses $wp_object_cache Object Cache Class
+ * @see WP_Object_Cache::delete()
+ *
+ * @param int|string $id What the contents in the cache are called
+ * @param string $flag Where the cache contents are grouped
+ * @return bool True on successful removal, false on failure
+ */
+function wp_cache_delete($id, $flag = '') {
+	global $wp_object_cache;
+
+	return $wp_object_cache->delete($id, $flag);
+}
+
+/**
+ * Removes all cache items.
+ *
+ * @since 2.0.0
+ * @uses $wp_object_cache Object Cache Class
+ * @see WP_Object_Cache::flush()
+ *
+ * @return bool Always returns true
+ */
+function wp_cache_flush() {
+	global $wp_object_cache;
+
+	return $wp_object_cache->flush();
+}
+
+/**
+ * Retrieves the cache contents from the cache by ID and flag.
+ *
+ * @since 2.0.0
+ * @uses $wp_object_cache Object Cache Class
+ * @see WP_Object_Cache::get()
+ *
+ * @param int|string $id What the contents in the cache are called
+ * @param string $flag Where the cache contents are grouped
+ * @return bool|mixed False on failure to retrieve contents or the cache
+ *		contents on success
+ */
+function wp_cache_get($id, $flag = '') {
+	global $wp_object_cache;
+
+	return $wp_object_cache->get($id, $flag);
+}
+
+/**
+ * Sets up Object Cache Global and assigns it.
+ *
+ * @since 2.0.0
+ * @global WP_Object_Cache $wp_object_cache WordPress Object Cache
+ */
+function wp_cache_init() {
+	$GLOBALS['wp_object_cache'] =& new WP_Object_Cache();
+}
+
+/**
+ * Replaces the contents of the cache with new data.
+ *
+ * @since 2.0.0
+ * @uses $wp_object_cache Object Cache Class
+ * @see WP_Object_Cache::replace()
+ *
+ * @param int|string $id What to call the contents in the cache
+ * @param mixed $data The contents to store in the cache
+ * @param string $flag Where to group the cache contents
+ * @param int $expire When to expire the cache contents
+ * @return bool False if cache ID and group already exists, true on success
+ */
+function wp_cache_replace($key, $data, $flag = '', $expire = 0) {
+	global $wp_object_cache;
+
+	return $wp_object_cache->replace($key, $data, $flag, $expire);
+}
+
+/**
+ * Saves the data to the cache.
+ *
+ * @since 2.0
+ * @uses $wp_object_cache Object Cache Class
+ * @see WP_Object_Cache::set()
+ *
+ * @param int|string $id What to call the contents in the cache
+ * @param mixed $data The contents to store in the cache
+ * @param string $flag Where to group the cache contents
+ * @param int $expire When to expire the cache contents
+ * @return bool False if cache ID and group already exists, true on success
+ */
+function wp_cache_set($key, $data, $flag = '', $expire = 0) {
+	global $wp_object_cache;
+
+	return $wp_object_cache->set($key, $data, $flag, $expire);
+}
+
+/**
+ * Adds a group or set of groups to the list of global groups.
+ *
+ * @since 2.6.0
+ *
+ * @param string|array $groups A group or an array of groups to add
+ */
+function wp_cache_add_global_groups( $groups ) {
+	// Default cache doesn't persist so nothing to do here.
+	return;
+}
+
+/**
+ * Adds a group or set of groups to the list of non-persistent groups.
+ *
+ * @since 2.6.0
+ *
+ * @param string|array $groups A group or an array of groups to add
+ */
+function wp_cache_add_non_persistent_groups( $groups ) {
+	// Default cache doesn't persist so nothing to do here.
+	return;
+}
+
+/**
+ * WordPress Object Cache
+ *
+ * The WordPress Object Cache is used to save on trips to the database. The
+ * Object Cache stores all of the cache data to memory and makes the cache
+ * contents available by using a key, which is used to name and later retrieve
+ * the cache contents.
+ *
+ * The Object Cache can be replaced by other caching mechanisms by placing files
+ * in the wp-content folder which is looked at in wp-settings. If that file
+ * exists, then this file will not be included.
+ *
+ * @package WordPress
+ * @subpackage Cache
+ * @since 2.0
+ */
+class WP_Object_Cache {
+
+	/**
+	 * Holds the cached objects
+	 *
+	 * @var array
+	 * @access private
+	 * @since 2.0.0
+	 */
+	var $cache = array ();
+
+	/**
+	 * Cache objects that do not exist in the cache
+	 *
+	 * @var array
+	 * @access private
+	 * @since 2.0.0
+	 */
+	var $non_existant_objects = array ();
+
+	/**
+	 * The amount of times the cache data was already stored in the cache.
+	 *
+	 * @since 2.5.0
+	 * @access private
+	 * @var int
+	 */
+	var $cache_hits = 0;
+
+	/**
+	 * Amount of times the cache did not have the request in cache
+	 *
+	 * @var int
+	 * @access public
+	 * @since 2.0.0
+	 */
+	var $cache_misses = 0;
+
+	/**
+	 * Adds data to the cache if it doesn't already exist.
+	 *
+	 * @uses WP_Object_Cache::get Checks to see if the cache already has data.
+	 * @uses WP_Object_Cache::set Sets the data after the checking the cache
+	 *		contents existance.
+	 *
+	 * @since 2.0.0
+	 *
+	 * @param int|string $id What to call the contents in the cache
+	 * @param mixed $data The contents to store in the cache
+	 * @param string $group Where to group the cache contents
+	 * @param int $expire When to expire the cache contents
+	 * @return bool False if cache ID and group already exists, true on success
+	 */
+	function add($id, $data, $group = 'default', $expire = '') {
+		if (empty ($group))
+			$group = 'default';
+
+		if (false !== $this->get($id, $group, false))
+			return false;
+
+		return $this->set($id, $data, $group, $expire);
+	}
+
+	/**
+	 * Remove the contents of the cache ID in the group
+	 *
+	 * If the cache ID does not exist in the group and $force parameter is set
+	 * to false, then nothing will happen. The $force parameter is set to false
+	 * by default.
+	 *
+	 * On success the group and the id will be added to the
+	 * $non_existant_objects property in the class.
+	 *
+	 * @since 2.0.0
+	 *
+	 * @param int|string $id What the contents in the cache are called
+	 * @param string $group Where the cache contents are grouped
+	 * @param bool $force Optional. Whether to force the unsetting of the cache
+	 *		ID in the group
+	 * @return bool False if the contents weren't deleted and true on success
+	 */
+	function delete($id, $group = 'default', $force = false) {
+		if (empty ($group))
+			$group = 'default';
+
+		if (!$force && false === $this->get($id, $group, false))
+			return false;
+
+		unset ($this->cache[$group][$id]);
+		$this->non_existant_objects[$group][$id] = true;
+		return true;
+	}
+
+	/**
+	 * Clears the object cache of all data
+	 *
+	 * @since 2.0.0
+	 *
+	 * @return bool Always returns true
+	 */
+	function flush() {
+		$this->cache = array ();
+
+		return true;
+	}
+
+	/**
+	 * Retrieves the cache contents, if it exists
+	 *
+	 * The contents will be first attempted to be retrieved by searching by the
+	 * ID in the cache group. If the cache is hit (success) then the contents
+	 * are returned.
+	 *
+	 * On failure, the $non_existant_objects property is checked and if the
+	 * cache group and ID exist in there the cache misses will not be
+	 * incremented. If not in the nonexistant objects property, then the cache
+	 * misses will be incremented and the cache group and ID will be added to
+	 * the nonexistant objects.
+	 *
+	 * @since 2.0.0
+	 *
+	 * @param int|string $id What the contents in the cache are called
+	 * @param string $group Where the cache contents are grouped
+	 * @return bool|mixed False on failure to retrieve contents or the cache
+	 *		contents on success
+	 */
+	function get($id, $group = 'default') {
+		if (empty ($group))
+			$group = 'default';
+
+		if (isset ($this->cache[$group][$id])) {
+			$this->cache_hits += 1;
+			if ( is_object($this->cache[$group][$id]) )
+				return wp_clone($this->cache[$group][$id]);
+			else
+				return $this->cache[$group][$id];
+		}
+
+		if ( isset ($this->non_existant_objects[$group][$id]) )
+			return false;
+
+		$this->non_existant_objects[$group][$id] = true;
+		$this->cache_misses += 1;
+		return false;
+	}
+
+	/**
+	 * Replace the contents in the cache, if contents already exist
+	 *
+	 * @since 2.0.0
+	 * @see WP_Object_Cache::set()
+	 *
+	 * @param int|string $id What to call the contents in the cache
+	 * @param mixed $data The contents to store in the cache
+	 * @param string $group Where to group the cache contents
+	 * @param int $expire When to expire the cache contents
+	 * @return bool False if not exists, true if contents were replaced
+	 */
+	function replace($id, $data, $group = 'default', $expire = '') {
+		if (empty ($group))
+			$group = 'default';
+
+		if (false === $this->get($id, $group, false))
+			return false;
+
+		return $this->set($id, $data, $group, $expire);
+	}
+
+	/**
+	 * Sets the data contents into the cache
+	 *
+	 * The cache contents is grouped by the $group parameter followed by the
+	 * $id. This allows for duplicate ids in unique groups. Therefore, naming of
+	 * the group should be used with care and should follow normal function
+	 * naming guidelines outside of core WordPress usage.
+	 *
+	 * The $expire parameter is not used, because the cache will automatically
+	 * expire for each time a page is accessed and PHP finishes. The method is
+	 * more for cache plugins which use files.
+	 *
+	 * @since 2.0.0
+	 *
+	 * @param int|string $id What to call the contents in the cache
+	 * @param mixed $data The contents to store in the cache
+	 * @param string $group Where to group the cache contents
+	 * @param int $expire Not Used
+	 * @return bool Always returns true
+	 */
+	function set($id, $data, $group = 'default', $expire = '') {
+		if (empty ($group))
+			$group = 'default';
+
+		if (NULL === $data)
+			$data = '';
+
+		if ( is_object($data) )
+			$data = wp_clone($data);
+
+		$this->cache[$group][$id] = $data;
+
+		if(isset($this->non_existant_objects[$group][$id]))
+			unset ($this->non_existant_objects[$group][$id]);
+
+		return true;
+	}
+
+	/**
+	 * Echos the stats of the caching.
+	 *
+	 * Gives the cache hits, and cache misses. Also prints every cached group,
+	 * key and the data.
+	 *
+	 * @since 2.0.0
+	 */
+	function stats() {
+		echo "<p>";
+		echo "<strong>Cache Hits:</strong> {$this->cache_hits}<br />";
+		echo "<strong>Cache Misses:</strong> {$this->cache_misses}<br />";
+		echo "</p>";
+
+		foreach ($this->cache as $group => $cache) {
+			echo "<p>";
+			echo "<strong>Group:</strong> $group<br />";
+			echo "<strong>Cache:</strong>";
+			echo "<pre>";
+			print_r($cache);
+			echo "</pre>";
+		}
+	}
+
+	/**
+	 * PHP4 constructor; Calls PHP 5 style constructor
+	 *
+	 * @since 2.0.0
+	 *
+	 * @return WP_Object_Cache
+	 */
+	function WP_Object_Cache() {
+		return $this->__construct();
+	}
+
+	/**
+	 * Sets up object properties; PHP 5 style constructor
+	 *
+	 * @since 2.0.8
+	 * @return null|WP_Object_Cache If cache is disabled, returns null.
+	 */
+	function __construct() {
+		/**
+		 * @todo This should be moved to the PHP4 style constructor, PHP5
+		 * already calls __destruct()
+		 */
+		register_shutdown_function(array(&$this, "__destruct"));
+	}
+
+	/**
+	 * Will save the object cache before object is completely destroyed.
+	 *
+	 * Called upon object destruction, which should be when PHP ends.
+	 *
+	 * @since  2.0.8
+	 *
+	 * @return bool True value. Won't be used by PHP
+	 */
+	function __destruct() {
+		return true;
+	}
+}
+?>