3 files changed, 124 insertions, 0 deletions
diff --git a/lib/public/Files/Notify/IChange.php b/lib/public/Files/Notify/IChange.php
new file mode 100644
index 00000000000..c7c758eec11
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+++ b/lib/public/Files/Notify/IChange.php
@@ -0,0 +1,54 @@
+<?php
+
+/**
+ * SPDX-FileCopyrightText: 2017 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OCP\Files\Notify;
+
+/**
+ * Represents a detected change in the storage
+ *
+ * @since 12.0.0
+ */
+interface IChange {
+	/**
+	 * @since 12.0.0
+	 */
+	public const ADDED = 1;
+
+	/**
+	 * @since 12.0.0
+	 */
+	public const REMOVED = 2;
+
+	/**
+	 * @since 12.0.0
+	 */
+	public const MODIFIED = 3;
+
+	/**
+	 * @since 12.0.0
+	 */
+	public const RENAMED = 4;
+
+	/**
+	 * Get the type of the change
+	 *
+	 * @return int IChange::ADDED, IChange::REMOVED, IChange::MODIFIED or IChange::RENAMED
+	 *
+	 * @since 12.0.0
+	 */
+	public function getType();
+
+	/**
+	 * Get the path of the file that was changed relative to the root of the storage
+	 *
+	 * Note, for rename changes this path is the old path for the file
+	 *
+	 * @return mixed
+	 *
+	 * @since 12.0.0
+	 */
+	public function getPath();
+}
diff --git a/lib/public/Files/Notify/INotifyHandler.php b/lib/public/Files/Notify/INotifyHandler.php
new file mode 100644
index 00000000000..09b3dbca919
--- /dev/null
+++ b/lib/public/Files/Notify/INotifyHandler.php
@@ -0,0 +1,47 @@
+<?php
+
+/**
+ * SPDX-FileCopyrightText: 2017 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OCP\Files\Notify;
+
+/**
+ * Provides access to detected changes in the storage by either actively listening
+ * or getting the list of changes that happened in the background
+ *
+ * @since 12.0.0
+ */
+interface INotifyHandler {
+	/**
+	 * Start listening for update notifications
+	 *
+	 * The provided callback will be called for every incoming notification with the following parameters
+	 *  - IChange|IRenameChange $change
+	 *
+	 * Note that this call is blocking and will not exit on it's own, to stop listening for notifications return `false` from the callback
+	 *
+	 * @param callable $callback
+	 *
+	 * @since 12.0.0
+	 */
+	public function listen(callable $callback);
+
+	/**
+	 * Get all changes detected since the start of the notify process or the last call to getChanges
+	 *
+	 * @return IChange[]
+	 *
+	 * @since 12.0.0
+	 */
+	public function getChanges();
+
+	/**
+	 * Stop listening for changes
+	 *
+	 * Note that any pending changes will be discarded
+	 *
+	 * @since 12.0.0
+	 */
+	public function stop();
+}
diff --git a/lib/public/Files/Notify/IRenameChange.php b/lib/public/Files/Notify/IRenameChange.php
new file mode 100644
index 00000000000..b1bfae5fc00
--- /dev/null
+++ b/lib/public/Files/Notify/IRenameChange.php
@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * SPDX-FileCopyrightText: 2017 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OCP\Files\Notify;
+
+/**
+ * Represents a detected rename change
+ *
+ * @since 12.0.0
+ */
+interface IRenameChange extends IChange {
+	/**
+	 * Get the new path of the renamed file relative to the storage root
+	 *
+	 * @return string
+	 *
+	 * @since 12.0.0
+	 */
+	public function getTargetPath();
+}