blob: 978c378e506a2459835b9bfcde38f6f9beb9b084 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
|
<?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;
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;
public function registerLockProvider(ILockProvider $lockProvider): void {
if ($this->lockProvider) {
throw new PreConditionNotMetException('There is already a registered lock provider');
}
$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->getLockProvider() !== null;
}
public function runInScope(LockContext $lock, callable $callback): void {
if (!$this->getLockProvider()) {
$callback();
return;
}
if ($this->lockInScope) {
throw new PreConditionNotMetException('Could not obtain lock scope as already in use by ' . $this->lockInScope);
}
try {
$this->lockInScope = $lock;
$callback();
} finally {
$this->lockInScope = null;
}
}
public function getLockInScope(): ?LockContext {
return $this->lockInScope;
}
public function getLocks(int $fileId): array {
if (!$this->getLockProvider()) {
throw new PreConditionNotMetException('No lock provider available');
}
return $this->getLockProvider()->getLocks($fileId);
}
public function lock(LockContext $lockInfo): ILock {
if (!$this->getLockProvider()) {
throw new PreConditionNotMetException('No lock provider available');
}
return $this->getLockProvider()->lock($lockInfo);
}
public function unlock(LockContext $lockInfo): void {
if (!$this->getLockProvider()) {
throw new PreConditionNotMetException('No lock provider available');
}
$this->getLockProvider()->unlock($lockInfo);
}
}
|
