1 files changed, 93 insertions, 0 deletions
diff --git a/lib/private/Hooks/EmitterTrait.php b/lib/private/Hooks/EmitterTrait.php
new file mode 100644
index 00000000000..7b2ec4ad7fe
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+++ b/lib/private/Hooks/EmitterTrait.php
@@ -0,0 +1,93 @@
+<?php
+
+/**
+ * SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-FileCopyrightText: 2016 ownCloud, Inc.
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+namespace OC\Hooks;
+
+/**
+ * @deprecated 18.0.0 use events and the \OCP\EventDispatcher\IEventDispatcher service
+ */
+trait EmitterTrait {
+	/**
+	 * @var callable[][] $listeners
+	 */
+	protected $listeners = [];
+
+	/**
+	 * @param string $scope
+	 * @param string $method
+	 * @param callable $callback
+	 * @deprecated 18.0.0 use \OCP\EventDispatcher\IEventDispatcher::addListener
+	 */
+	public function listen($scope, $method, callable $callback) {
+		$eventName = $scope . '::' . $method;
+		if (!isset($this->listeners[$eventName])) {
+			$this->listeners[$eventName] = [];
+		}
+		if (!in_array($callback, $this->listeners[$eventName], true)) {
+			$this->listeners[$eventName][] = $callback;
+		}
+	}
+
+	/**
+	 * @param string $scope optional
+	 * @param string $method optional
+	 * @param callable $callback optional
+	 * @deprecated 18.0.0 use \OCP\EventDispatcher\IEventDispatcher::removeListener
+	 */
+	public function removeListener($scope = null, $method = null, ?callable $callback = null) {
+		$names = [];
+		$allNames = array_keys($this->listeners);
+		if ($scope and $method) {
+			$name = $scope . '::' . $method;
+			if (isset($this->listeners[$name])) {
+				$names[] = $name;
+			}
+		} elseif ($scope) {
+			foreach ($allNames as $name) {
+				$parts = explode('::', $name, 2);
+				if ($parts[0] == $scope) {
+					$names[] = $name;
+				}
+			}
+		} elseif ($method) {
+			foreach ($allNames as $name) {
+				$parts = explode('::', $name, 2);
+				if ($parts[1] == $method) {
+					$names[] = $name;
+				}
+			}
+		} else {
+			$names = $allNames;
+		}
+
+		foreach ($names as $name) {
+			if ($callback) {
+				$index = array_search($callback, $this->listeners[$name], true);
+				if ($index !== false) {
+					unset($this->listeners[$name][$index]);
+				}
+			} else {
+				$this->listeners[$name] = [];
+			}
+		}
+	}
+
+	/**
+	 * @param string $scope
+	 * @param string $method
+	 * @param array $arguments optional
+	 * @deprecated 18.0.0 use \OCP\EventDispatcher\IEventDispatcher::dispatchTyped
+	 */
+	protected function emit($scope, $method, array $arguments = []) {
+		$eventName = $scope . '::' . $method;
+		if (isset($this->listeners[$eventName])) {
+			foreach ($this->listeners[$eventName] as $callback) {
+				call_user_func_array($callback, $arguments);
+			}
+		}
+	}
+}