feat: Add factory method for in-memory caches

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

2 files changed, 21 insertions, 0 deletions

diff --git a/lib/private/Memcache/Factory.php b/lib/private/Memcache/Factory.php
index fa2dfeb75dd..16d6ae32f72 100644
--- a/lib/private/Memcache/Factory.php
+++ b/lib/private/Memcache/Factory.php
@@ -31,6 +31,7 @@
  */
 namespace OC\Memcache;
 
+use OCP\Cache\CappedMemoryCache;
 use OCP\Profiler\IProfiler;
 use OCP\ICache;
 use OCP\ICacheFactory;
@@ -184,6 +185,10 @@ class Factory implements ICacheFactory {
 		return $this->distributedCacheClass !== self::NULL_CACHE;
 	}
 
+	public function createInMemory(int $capacity = 512): ICache {
+		return new CappedMemoryCache($capacity);
+	}
+
 	/**
 	 * Check if a local memory cache backend is available
 	 *
diff --git a/lib/public/ICacheFactory.php b/lib/public/ICacheFactory.php
index d70a836aa52..70ad955849d 100644
--- a/lib/public/ICacheFactory.php
+++ b/lib/public/ICacheFactory.php
@@ -75,4 +75,20 @@ interface ICacheFactory {
 	 * @since 13.0.0
 	 */
 	public function createLocal(string $prefix = ''): ICache;
+
+	/**
+	 * Create an in-memory cache instance
+	 *
+	 * Useful for remembering values inside one process. Cache memory is cleared
+	 * when the object is garbage-collected. Implementation may also expire keys
+	 * earlier when the TTL is reached or too much memory is consumed.
+	 *
+	 * Cache keys are local to the cache object. When building two in-memory
+	 * caches, there is no data exchange between the instances.
+	 *
+	 * @param int $capacity maximum number of cache keys
+	 * @return ICache
+	 * @since 28.0.0
+	 */
+	public function createInMemory(int $capacity = 512): ICache;
 }