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98 lines
2.8 KiB
PHP
98 lines
2.8 KiB
PHP
<?php
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declare(strict_types=1);
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/**
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* SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
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* SPDX-FileCopyrightText: 2016 ownCloud, Inc.
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* SPDX-License-Identifier: AGPL-3.0-only
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*/
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namespace OC\Lock;
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use OCP\Lock\ILockingProvider;
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/**
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* Base locking provider that keeps track of locks acquired during the current request
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* to release any leftover locks at the end of the request
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*/
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abstract class AbstractLockingProvider implements ILockingProvider {
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protected array $acquiredLocks = [
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'shared' => [],
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'exclusive' => []
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];
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/**
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*
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* @param int $ttl how long until we clear stray locks in seconds
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*/
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public function __construct(
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protected int $ttl,
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) {
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}
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/** @inheritDoc */
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protected function hasAcquiredLock(string $path, int $type): bool {
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if ($type === self::LOCK_SHARED) {
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return isset($this->acquiredLocks['shared'][$path]) && $this->acquiredLocks['shared'][$path] > 0;
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} else {
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return isset($this->acquiredLocks['exclusive'][$path]) && $this->acquiredLocks['exclusive'][$path] === true;
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}
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}
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/** @inheritDoc */
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protected function markAcquire(string $path, int $targetType): void {
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if ($targetType === self::LOCK_SHARED) {
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if (!isset($this->acquiredLocks['shared'][$path])) {
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$this->acquiredLocks['shared'][$path] = 0;
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}
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$this->acquiredLocks['shared'][$path]++;
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} else {
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$this->acquiredLocks['exclusive'][$path] = true;
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}
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}
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/** @inheritDoc */
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protected function markRelease(string $path, int $type): void {
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if ($type === self::LOCK_SHARED) {
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if (isset($this->acquiredLocks['shared'][$path]) and $this->acquiredLocks['shared'][$path] > 0) {
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$this->acquiredLocks['shared'][$path]--;
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if ($this->acquiredLocks['shared'][$path] === 0) {
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unset($this->acquiredLocks['shared'][$path]);
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}
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}
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} elseif ($type === self::LOCK_EXCLUSIVE) {
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unset($this->acquiredLocks['exclusive'][$path]);
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}
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}
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/** @inheritDoc */
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protected function markChange(string $path, int $targetType): void {
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if ($targetType === self::LOCK_SHARED) {
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unset($this->acquiredLocks['exclusive'][$path]);
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if (!isset($this->acquiredLocks['shared'][$path])) {
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$this->acquiredLocks['shared'][$path] = 0;
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}
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$this->acquiredLocks['shared'][$path]++;
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} elseif ($targetType === self::LOCK_EXCLUSIVE) {
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$this->acquiredLocks['exclusive'][$path] = true;
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$this->acquiredLocks['shared'][$path]--;
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}
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}
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/** @inheritDoc */
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public function releaseAll(): void {
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foreach ($this->acquiredLocks['shared'] as $path => $count) {
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for ($i = 0; $i < $count; $i++) {
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$this->releaseLock($path, self::LOCK_SHARED);
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}
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}
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foreach ($this->acquiredLocks['exclusive'] as $path => $hasLock) {
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$this->releaseLock($path, self::LOCK_EXCLUSIVE);
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}
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}
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protected function getOwnSharedLockCount(string $path): int {
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return $this->acquiredLocks['shared'][$path] ?? 0;
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}
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}
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