1 files changed, 142 insertions, 0 deletions
diff --git a/lib/private/Memcache/ArrayCache.php b/lib/private/Memcache/ArrayCache.php
new file mode 100644
index 00000000000..9b3540b771f
--- /dev/null
+++ b/lib/private/Memcache/ArrayCache.php
@@ -0,0 +1,142 @@
+<?php
+
+/**
+ * SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-FileCopyrightText: 2016 ownCloud, Inc.
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+namespace OC\Memcache;
+
+use OCP\IMemcache;
+
+class ArrayCache extends Cache implements IMemcache {
+	/** @var array Array with the cached data */
+	protected $cachedData = [];
+
+	use CADTrait;
+
+	/**
+	 * {@inheritDoc}
+	 */
+	public function get($key) {
+		if ($this->hasKey($key)) {
+			return $this->cachedData[$key];
+		}
+		return null;
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	public function set($key, $value, $ttl = 0) {
+		$this->cachedData[$key] = $value;
+		return true;
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	public function hasKey($key) {
+		return isset($this->cachedData[$key]);
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	public function remove($key) {
+		unset($this->cachedData[$key]);
+		return true;
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	public function clear($prefix = '') {
+		if ($prefix === '') {
+			$this->cachedData = [];
+			return true;
+		}
+
+		foreach ($this->cachedData as $key => $value) {
+			if (str_starts_with($key, $prefix)) {
+				$this->remove($key);
+			}
+		}
+		return true;
+	}
+
+	/**
+	 * Set a value in the cache if it's not already stored
+	 *
+	 * @param string $key
+	 * @param mixed $value
+	 * @param int $ttl Time To Live in seconds. Defaults to 60*60*24
+	 * @return bool
+	 */
+	public function add($key, $value, $ttl = 0) {
+		// since this cache is not shared race conditions aren't an issue
+		if ($this->hasKey($key)) {
+			return false;
+		} else {
+			return $this->set($key, $value, $ttl);
+		}
+	}
+
+	/**
+	 * Increase a stored number
+	 *
+	 * @param string $key
+	 * @param int $step
+	 * @return int | bool
+	 */
+	public function inc($key, $step = 1) {
+		$oldValue = $this->get($key);
+		if (is_int($oldValue)) {
+			$this->set($key, $oldValue + $step);
+			return $oldValue + $step;
+		} else {
+			$success = $this->add($key, $step);
+			return $success ? $step : false;
+		}
+	}
+
+	/**
+	 * Decrease a stored number
+	 *
+	 * @param string $key
+	 * @param int $step
+	 * @return int | bool
+	 */
+	public function dec($key, $step = 1) {
+		$oldValue = $this->get($key);
+		if (is_int($oldValue)) {
+			$this->set($key, $oldValue - $step);
+			return $oldValue - $step;
+		} else {
+			return false;
+		}
+	}
+
+	/**
+	 * Compare and set
+	 *
+	 * @param string $key
+	 * @param mixed $old
+	 * @param mixed $new
+	 * @return bool
+	 */
+	public function cas($key, $old, $new) {
+		if ($this->get($key) === $old) {
+			return $this->set($key, $new);
+		} else {
+			return false;
+		}
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	public static function isAvailable(): bool {
+		return true;
+	}
+}