diff --git a/lib/public/activity/iconsumer.php b/lib/public/activity/iconsumer.php
new file mode 100644
index 00000000000..4b82bc01b05
--- /dev/null
+++ b/lib/public/activity/iconsumer.php
@@ -0,0 +1,29 @@
+<?php
+ /**
+ * ownCloud
+ *
+ * @author Thomas Müller
+ * @copyright 2013 Thomas Müller deepdiver@owncloud.com
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU AFFERO GENERAL PUBLIC LICENSE for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public
+ * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+
+namespace OCP\Activity;
+
+interface IConsumer {
+	function receive($app, $subject, $message, $file, $link);
+}
+
diff --git a/lib/public/activity/imanager.php b/lib/public/activity/imanager.php
new file mode 100644
index 00000000000..da7e9d4b662
--- /dev/null
+++ b/lib/public/activity/imanager.php
@@ -0,0 +1,41 @@
+<?php
+ /**
+ * ownCloud
+ *
+ * @author Thomas Müller
+ * @copyright 2013 Thomas Müller deepdiver@owncloud.com
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU AFFERO GENERAL PUBLIC LICENSE for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public
+ * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+
+namespace OCP\Activity;
+
+interface IManager {
+
+	function publishActivity($app, $subject, $message, $file, $link);
+
+	/**
+	 * In order to improve lazy loading a closure can be registered which will be called in case
+	 * activity consumers are actually requested
+	 *
+	 * $callable has to return an instance of OCA\Activity\IConsumer
+	 *
+	 * @param string $key
+	 * @param \Closure $callable
+	 */
+	function registerConsumer(\Closure $callable);
+
+}
diff --git a/lib/public/iservercontainer.php b/lib/public/iservercontainer.php
index 1725b7c74e0..41def099691 100644
--- a/lib/public/iservercontainer.php
+++ b/lib/public/iservercontainer.php
@@ -76,4 +76,11 @@ interface IServerContainer {
 	 */
 	function getSession();
 
+	/**
+	 * Returns the activity manager
+	 *
+	 * @return \OCP\Activity\IManager
+	 */
+	function getActivityManager();
+
 }