1 files changed, 96 insertions, 0 deletions
diff --git a/engine/classes/ElggStaticVariableCache.php b/engine/classes/ElggStaticVariableCache.php
new file mode 100644
index 000000000..9c14fdfba
--- /dev/null
+++ b/engine/classes/ElggStaticVariableCache.php
@@ -0,0 +1,96 @@
+<?php
+/**
+ * ElggStaticVariableCache
+ * Dummy cache which stores values in a static array. Using this makes future
+ * replacements to other caching back ends (eg memcache) much easier.
+ *
+ * @package    Elgg.Core
+ * @subpackage Cache
+ */
+class ElggStaticVariableCache extends ElggSharedMemoryCache {
+	/**
+	 * The cache.
+	 *
+	 * @var array
+	 */
+	private static $__cache;
+
+	/**
+	 * 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 $namespace The namespace for this cache to write to.
+	 * @warning namespaces of the same name are shared!
+	 */
+	function __construct($namespace = 'default') {
+		$this->setNamespace($namespace);
+		$this->clear();
+	}
+
+	/**
+	 * Save a key
+	 *
+	 * @param string $key  Name
+	 * @param string $data Value
+	 *
+	 * @return boolean
+	 */
+	public function save($key, $data) {
+		$namespace = $this->getNamespace();
+
+		ElggStaticVariableCache::$__cache[$namespace][$key] = $data;
+
+		return true;
+	}
+
+	/**
+	 * Load a key
+	 *
+	 * @param string $key    Name
+	 * @param int    $offset Offset
+	 * @param int    $limit  Limit
+	 *
+	 * @return string
+	 */
+	public function load($key, $offset = 0, $limit = null) {
+		$namespace = $this->getNamespace();
+
+		if (isset(ElggStaticVariableCache::$__cache[$namespace][$key])) {
+			return ElggStaticVariableCache::$__cache[$namespace][$key];
+		}
+
+		return false;
+	}
+
+	/**
+	 * Invalidate a given key.
+	 *
+	 * @param string $key Name
+	 *
+	 * @return bool
+	 */
+	public function delete($key) {
+		$namespace = $this->getNamespace();
+
+		unset(ElggStaticVariableCache::$__cache[$namespace][$key]);
+
+		return true;
+	}
+
+	/**
+	 * Clears the cache for a particular namespace
+	 *
+	 * @return void
+	 */
+	public function clear() {
+		$namespace = $this->getNamespace();
+
+		if (!isset(ElggStaticVariableCache::$__cache)) {
+			ElggStaticVariableCache::$__cache = array();
+		}
+
+		ElggStaticVariableCache::$__cache[$namespace] = array();
+	}
+}