1 files changed, 37 insertions, 8 deletions

diff --git a/lib/private/Files/Lock/LockManager.php b/lib/private/Files/Lock/LockManager.php
index e2af532a01c..978c378e506 100644
--- a/lib/private/Files/Lock/LockManager.php
+++ b/lib/private/Files/Lock/LockManager.php
@@ -1,5 +1,9 @@
 <?php
 
+/**
+ * SPDX-FileCopyrightText: 2022 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
 namespace OC\Files\Lock;
 
 use OCP\Files\Lock\ILock;
@@ -7,8 +11,11 @@ use OCP\Files\Lock\ILockManager;
 use OCP\Files\Lock\ILockProvider;
 use OCP\Files\Lock\LockContext;
 use OCP\PreConditionNotMetException;
+use Psr\Container\ContainerExceptionInterface;
+use Psr\Container\NotFoundExceptionInterface;
 
 class LockManager implements ILockManager {
+	private ?string $lockProviderClass = null;
 	private ?ILockProvider $lockProvider = null;
 	private ?LockContext $lockInScope = null;
 
@@ -20,12 +27,34 @@ class LockManager implements ILockManager {
 		$this->lockProvider = $lockProvider;
 	}
 
+	public function registerLazyLockProvider(string $lockProviderClass): void {
+		if ($this->lockProviderClass || $this->lockProvider) {
+			throw new PreConditionNotMetException('There is already a registered lock provider');
+		}
+
+		$this->lockProviderClass = $lockProviderClass;
+	}
+
+	private function getLockProvider(): ?ILockProvider {
+		if ($this->lockProvider) {
+			return $this->lockProvider;
+		}
+		if ($this->lockProviderClass) {
+			try {
+				$this->lockProvider = \OCP\Server::get($this->lockProviderClass);
+			} catch (NotFoundExceptionInterface|ContainerExceptionInterface $e) {
+			}
+		}
+
+		return $this->lockProvider;
+	}
+
 	public function isLockProviderAvailable(): bool {
-		return $this->lockProvider !== null;
+		return $this->getLockProvider() !== null;
 	}
 
 	public function runInScope(LockContext $lock, callable $callback): void {
-		if (!$this->lockProvider) {
+		if (!$this->getLockProvider()) {
 			$callback();
 			return;
 		}
@@ -47,26 +76,26 @@ class LockManager implements ILockManager {
 	}
 
 	public function getLocks(int $fileId): array {
-		if (!$this->lockProvider) {
+		if (!$this->getLockProvider()) {
 			throw new PreConditionNotMetException('No lock provider available');
 		}
 
-		return $this->lockProvider->getLocks($fileId);
+		return $this->getLockProvider()->getLocks($fileId);
 	}
 
 	public function lock(LockContext $lockInfo): ILock {
-		if (!$this->lockProvider) {
+		if (!$this->getLockProvider()) {
 			throw new PreConditionNotMetException('No lock provider available');
 		}
 
-		return $this->lockProvider->lock($lockInfo);
+		return $this->getLockProvider()->lock($lockInfo);
 	}
 
 	public function unlock(LockContext $lockInfo): void {
-		if (!$this->lockProvider) {
+		if (!$this->getLockProvider()) {
 			throw new PreConditionNotMetException('No lock provider available');
 		}
 
-		$this->lockProvider->unlock($lockInfo);
+		$this->getLockProvider()->unlock($lockInfo);
 	}
 }