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-rw-r--r--engine/lib/cache.php157
1 files changed, 156 insertions, 1 deletions
diff --git a/engine/lib/cache.php b/engine/lib/cache.php
index 55d389bab..25205dfb1 100644
--- a/engine/lib/cache.php
+++ b/engine/lib/cache.php
@@ -19,7 +19,8 @@
* @package Elgg
* @subpackage API
*/
- abstract class ElggCache
+ abstract class ElggCache implements
+ ArrayAccess // Override for array access
{
/**
* Variables for the cache object.
@@ -62,6 +63,38 @@
}
/**
+ * Class member get overloading, returning key using $this->load defaults.
+ *
+ * @param string $key
+ * @return mixed
+ */
+ function __get($key) { return $this->load($key); }
+
+ /**
+ * Class member set overloading, setting a key using $this->save defaults.
+ *
+ * @param string $key
+ * @param mixed $value
+ * @return mixed
+ */
+ function __set($key, $value) { return $this->save($key, $value); }
+
+ /**
+ * Supporting isset, using $this->load() with default values.
+ *
+ * @param string $key The name of the attribute or metadata.
+ * @return bool
+ */
+ function __isset($key) { if ($this->load($key)!="") return true; else return false; }
+
+ /**
+ * Supporting unsetting of magic attributes.
+ *
+ * @param string $key The name of the attribute or metadata.
+ */
+ function __unset($key) { return $this->delete($key); }
+
+ /**
* Save data in a cache.
*
* @param string $key
@@ -79,6 +112,110 @@
* @return mixed The stored data or false.
*/
abstract public function load($key, $offset = 0, $limit = null);
+
+ /**
+ * Invalidate a key
+ *
+ * @param string $key
+ * @return bool
+ */
+ abstract public function delete($key);
+
+ /**
+ * Clear out all the contents of the cache.
+ *
+ */
+ abstract public function clear();
+
+ // ARRAY ACCESS INTERFACE //////////////////////////////////////////////////////////
+ function offsetSet($key, $value)
+ {
+ $this->save($key, $value);
+ }
+
+ function offsetGet($key)
+ {
+ return $this->load($key);
+ }
+
+ function offsetUnset($key)
+ {
+ if ( isset($this->key) ) {
+ unset($this->key);
+ }
+ }
+
+ function offsetExists($offset)
+ {
+ return isset($this->$offset);
+ }
+ }
+
+ /**
+ * ElggStaticVariableCache
+ * Dummy cache which stores values in a static array. Using this makes future replacements to other caching back
+ * ends (eg memcache) much easier.
+ *
+ * @author Curverider Ltd <info@elgg.com>
+ * @package Elgg
+ * @subpackage API
+ */
+ class ElggStaticVariableCache extends ElggCache
+ {
+ /**
+ * The cache.
+ *
+ * @var unknown_type
+ */
+ private static $__cache;
+
+ /**
+ * ID of a cache to use.
+ *
+ * @var unknown_type
+ */
+ private $cache_id;
+
+ /**
+ * Create the variable cache.
+ *
+ * This function creates a variable cache in a static variable in memory, optionally with a given namespace (to avoid overlap).
+ *
+ * @param string $cache_id The namespace for this cache to write to - note, namespaces of the same name are shared!
+ */
+ function __construct($cache_id = 'default')
+ {
+ $this->cache_id = $cache_id;
+
+ }
+
+ public function save($key, $data)
+ {
+ ElggStaticVariableCache::$__cache[$this->cache_id][$key] = $data;
+
+ return true;
+ }
+
+ public function load($key, $offset = 0, $limit = null)
+ {
+ return ElggStaticVariableCache::$__cache[$this->cache_id][$key];
+ }
+
+ public function delete($key)
+ {
+ unset(ElggStaticVariableCache::$__cache[$this->cache_id][$key]);
+
+ return true;
+ }
+
+ public function clear()
+ {
+ if (!ElggStaticVariableCache::$__cache)
+ ElggStaticVariableCache::$__cache = array();
+
+ if (!ElggStaticVariableCache::$__cache[$this->cache_id])
+ ElggStaticVariableCache::$__cache[$this->cache_id] = array();
+ }
}
/**
@@ -190,6 +327,24 @@
return false;
}
+ /**
+ * Invalidate a given key.
+ *
+ * @param string $key
+ * @return bool
+ */
+ public function delete($key)
+ {
+ $dir = $this->get_variable("cache_path");
+
+ return unlink($dir.$f);
+ }
+
+ public function clear()
+ {
+ // TODO : writeme
+ }
+
public function __destruct()
{
// TODO: Check size and age, clean up accordingly