hans-d · June 15, 2012 22:13 · Jun 15, 2012
diff --git a/gistfile1.aw b/gistfile1.aw
@@ -0,0 +1,75 @@
+<?php
+
+namespace app\extensions\action;
+
+/**
+ * Observer for the Observer pattern. When a subject sends a notification for an event,
+ * the registered listeners can act upon it.
+ *
+ * @author hdonner
+ *
+ */
+class Observers extends \lithium\core\StaticObject {
+
+	/**
+	 * The registered listeners per event
+	 *
+	 * @var array
+	 */
+	protected static $_listeners = array();
+
+	/**
+	 * Adds a listener for the given event.
+	 *
+	 * @param string $event
+	 * @param callable $callable the callback to be used
+	 */
+	public static function add($event, $callable) {
+		if (!isset(static::$_listeners[$event])) {
+			static::$_listeners[$event] = array();
+		}
+		return static::$_listeners[$event][] = $callable;
+	}
+
+	/**
+	 * Gets a list of registered events, or a list of listeners for a
+	 * specific event.
+	 *
+	 * @param string $name `null` to get a list of all events, or the event name
+	 * @return mixed
+	 */
+	public static function get($event = null) {
+		if (!$event) {
+			return array_keys(static::$_listeners);
+		}
+		if (!isset(static::$_listeners[$event])) {
+			return null;
+		}
+		return static::$_listeners[$event];
+	}
+
+	/**
+	 * Called by a subject to notify the listeners of an event.
+	 *
+	 * For each notification, the callbacks of all the listeners for that
+	 * event a called with the specified arguments.
+	 *
+	 * @param string $event name of the event
+	 * @param array $args arguments to pass
+	 */
+	public static function notify($event, $args=array()) {
+		if (isset(static::$_listeners[$event])) {
+			foreach (static::$_listeners[$event] as $listener) {
+				$listener($args);
+			}
+		}
+	}
+
+	/**
+	 * Resets all the listeners to zero.
+	 */
+	public static function reset() {
+		static::$_listeners = array();
+	}
+
+}
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