Factory::createLowLatency() - Code Metrics - Inspection of "Properly provide local memcache check to ICacheFac..." - nextcloud/server - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#8806)

by Morris

created 2018-03-13 17:19 UTC

Factory::createLowLatency() A

↳ Parent: Factory

Complexity

Conditions	1
Paths	1

Size

Total Lines	3
Code Lines	2

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	1
eloc	2
nc	1
nop	1
dl	0
loc	3
rs	10
c	0
b	0
f	0

<?php
/**
 * @copyright Copyright (c) 2016, ownCloud, Inc.
 *
 * @author Andreas Fischer <[email protected]>
 * @author Joas Schilling <[email protected]>
 * @author Lukas Reschke <[email protected]>
 * @author Markus Goetz <[email protected]>
 * @author Morris Jobke <[email protected]>
 * @author Robin Appelman <[email protected]>
 * @author Robin McCorkell <[email protected]>
 * @author Stefan Weil <[email protected]>
 * @author Thomas Müller <[email protected]>
 * @author Vincent Petry <[email protected]>
 *
 * @license AGPL-3.0
 *
 * This code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License, version 3,
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *
 */

namespace OC\Memcache;

use OCP\ICache;
use OCP\ICacheFactory;
use OCP\ILogger;
use OCP\IMemcache;

class Factory implements ICacheFactory {
	const NULL_CACHE = NullCache::class;

	/**
	 * @var string $globalPrefix
	 */
	private $globalPrefix;

	/**
	 * @var ILogger $logger
	 */
	private $logger;

	/**
	 * @var string $localCacheClass
	 */
	private $localCacheClass;

	/**
	 * @var string $distributedCacheClass
	 */
	private $distributedCacheClass;

	/**
	 * @var string $lockingCacheClass
	 */
	private $lockingCacheClass;

	/**
	 * @param string $globalPrefix
	 * @param ILogger $logger
	 * @param string|null $localCacheClass
	 * @param string|null $distributedCacheClass
	 * @param string|null $lockingCacheClass
	 */
	public function __construct(string $globalPrefix, ILogger $logger,
		$localCacheClass = null, $distributedCacheClass = null, $lockingCacheClass = null)
	{
		$this->logger = $logger;
		$this->globalPrefix = $globalPrefix;

		if (!$localCacheClass) {
''   == false // true
''   == null  // true
'ab' == false // false
'ab' == null  // false

// It is often better to use strict comparison
'' === false // false
'' === null  // false
			$localCacheClass = self::NULL_CACHE;
		}
		if (!$distributedCacheClass) {
''   == false // true
''   == null  // true
'ab' == false // false
'ab' == null  // false

// It is often better to use strict comparison
'' === false // false
'' === null  // false
			$distributedCacheClass = $localCacheClass;
		}

		$missingCacheMessage = 'Memcache {class} not available for {use} cache';
		$missingCacheHint = 'Is the matching PHP module installed and enabled?';
		if (!class_exists($localCacheClass) || !$localCacheClass::isAvailable()) {
			if (\OC::$CLI && !defined('PHPUNIT_RUN')) {
				// CLI should not hard-fail on broken memcache
				$this->logger->info($missingCacheMessage, [
					'class' => $localCacheClass,
					'use' => 'local',
					'app' => 'cli'
				]);
				$localCacheClass = self::NULL_CACHE;
			} else {
				throw new \OC\HintException(strtr($missingCacheMessage, [
					'{class}' => $localCacheClass, '{use}' => 'local'
				]), $missingCacheHint);
			}
		}
		if (!class_exists($distributedCacheClass) || !$distributedCacheClass::isAvailable()) {
			if (\OC::$CLI && !defined('PHPUNIT_RUN')) {
				// CLI should not hard-fail on broken memcache
				$this->logger->info($missingCacheMessage, [
					'class' => $distributedCacheClass,
					'use' => 'distributed',
					'app' => 'cli'
				]);
				$distributedCacheClass = self::NULL_CACHE;
			} else {
				throw new \OC\HintException(strtr($missingCacheMessage, [
					'{class}' => $distributedCacheClass, '{use}' => 'distributed'
				]), $missingCacheHint);
			}
		}
		if (!($lockingCacheClass && class_exists($distributedCacheClass) && $lockingCacheClass::isAvailable())) {
''   == false // true
''   == null  // true
'ab' == false // false
'ab' == null  // false

// It is often better to use strict comparison
'' === false // false
'' === null  // false
			// don't fallback since the fallback might not be suitable for storing lock
			$lockingCacheClass = self::NULL_CACHE;
		}

		$this->localCacheClass = $localCacheClass;
		$this->distributedCacheClass = $distributedCacheClass;
		$this->lockingCacheClass = $lockingCacheClass;
	}

	/**
	 * create a cache instance for storing locks
	 *
	 * @param string $prefix
	 * @return IMemcache
	 */
	public function createLocking(string $prefix = ''): IMemcache {
		return new $this->lockingCacheClass($this->globalPrefix . '/' . $prefix);
	}

	/**
	 * create a distributed cache instance
	 *
	 * @param string $prefix
	 * @return ICache
	 */
	public function createDistributed(string $prefix = ''): ICache {
		return new $this->distributedCacheClass($this->globalPrefix . '/' . $prefix);
	}

	/**
	 * create a local cache instance
	 *
	 * @param string $prefix
	 * @return ICache
	 */
	public function createLocal(string $prefix = ''): ICache {
		return new $this->localCacheClass($this->globalPrefix . '/' . $prefix);
	}

	/**
	 * @see \OC\Memcache\Factory::createDistributed()
	 * @param string $prefix
	 * @return ICache
	 * @deprecated 13.0.0 Use either createLocking, createDistributed or createLocal
	 */
	public function create(string $prefix = ''): ICache {
		return $this->createDistributed($prefix);
	}

	/**
	 * check memcache availability
	 *
	 * @return bool
	 */
	public function isAvailable(): bool {
		return ($this->distributedCacheClass !== self::NULL_CACHE);
	}

	/**
	 * @see \OC\Memcache\Factory::createLocal()
	 * @param string $prefix
	 * @return ICache
	 */
	public function createLowLatency(string $prefix = ''): ICache {
		return $this->createLocal($prefix);
	}

	/**
	 * Check if a local memory cache backend is available
	 *
	 * @return bool
	 */
	public function isLocalCacheAvailable(): bool {
		return ($this->localCacheClass !== self::NULL_CACHE);
	}
}


1		<?php
2		/**
3		* @copyright Copyright (c) 2016, ownCloud, Inc.
4		*
5		* @author Andreas Fischer <[email protected]>
6		* @author Joas Schilling <[email protected]>
7		* @author Lukas Reschke <[email protected]>
8		* @author Markus Goetz <[email protected]>
9		* @author Morris Jobke <[email protected]>
10		* @author Robin Appelman <[email protected]>
11		* @author Robin McCorkell <[email protected]>
12		* @author Stefan Weil <[email protected]>
13		* @author Thomas Müller <[email protected]>
14		* @author Vincent Petry <[email protected]>
15		*
16		* @license AGPL-3.0
17		*
18		* This code is free software: you can redistribute it and/or modify
19		* it under the terms of the GNU Affero General Public License, version 3,
20		* as published by the Free Software Foundation.
21		*
22		* This program is distributed in the hope that it will be useful,
23		* but WITHOUT ANY WARRANTY; without even the implied warranty of
24		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25		* GNU Affero General Public License for more details.
26		*
27		* You should have received a copy of the GNU Affero General Public License, version 3,
28		* along with this program. If not, see <http://www.gnu.org/licenses/>
29		*
30		*/
31
32		namespace OC\Memcache;
33
34		use OCP\ICache;
35		use OCP\ICacheFactory;
36		use OCP\ILogger;
37		use OCP\IMemcache;
38
39		class Factory implements ICacheFactory {
40		const NULL_CACHE = NullCache::class;
41
42		/**
43		* @var string $globalPrefix
44		*/
45		private $globalPrefix;
46
47		/**
48		* @var ILogger $logger
49		*/
50		private $logger;
51
52		/**
53		* @var string $localCacheClass
54		*/
55		private $localCacheClass;
56
57		/**
58		* @var string $distributedCacheClass
59		*/
60		private $distributedCacheClass;
61
62		/**
63		* @var string $lockingCacheClass
64		*/
65		private $lockingCacheClass;
66
67		/**
68		* @param string $globalPrefix
69		* @param ILogger $logger
70		* @param string\|null $localCacheClass
71		* @param string\|null $distributedCacheClass
72		* @param string\|null $lockingCacheClass
73		*/
74		public function __construct(string $globalPrefix, ILogger $logger,
75		$localCacheClass = null, $distributedCacheClass = null, $lockingCacheClass = null)
76		{
77		$this->logger = $logger;
78		$this->globalPrefix = $globalPrefix;
79
80		if (!$localCacheClass) {
		0 ignored issues – show Bug Best Practice introduced 2016-06-13 14:40 UTC by Report Bug Copy Issue Report The expression `$localCacheClass` of type `string\|null` is loosely compared to `false`; this is ambiguous if the string can be empty. You might want to explicitly use `=== null` instead. In PHP, under loose comparison (like `==`, or `!=`, or `switch` conditions), values of different types might be equal. For `string` values, the empty string `''` is a special case, in particular the following results might be unexpected: '' == false // true '' == null // true 'ab' == false // false 'ab' == null // false // It is often better to use strict comparison '' === false // false '' === null // false Loading history...
81		$localCacheClass = self::NULL_CACHE;
82		}
83		if (!$distributedCacheClass) {
		0 ignored issues – show Bug Best Practice introduced 2017-04-18 12:45 UTC by Report Bug Copy Issue Report The expression `$distributedCacheClass` of type `string\|null` is loosely compared to `false`; this is ambiguous if the string can be empty. You might want to explicitly use `=== null` instead. In PHP, under loose comparison (like `==`, or `!=`, or `switch` conditions), values of different types might be equal. For `string` values, the empty string `''` is a special case, in particular the following results might be unexpected: '' == false // true '' == null // true 'ab' == false // false 'ab' == null // false // It is often better to use strict comparison '' === false // false '' === null // false Loading history...
84		$distributedCacheClass = $localCacheClass;
85		}
86
87		$missingCacheMessage = 'Memcache {class} not available for {use} cache';
88		$missingCacheHint = 'Is the matching PHP module installed and enabled?';
89	View Code Duplication	if (!class_exists($localCacheClass) \|\| !$localCacheClass::isAvailable()) {
90		if (\OC::$CLI && !defined('PHPUNIT_RUN')) {
91		// CLI should not hard-fail on broken memcache
92		$this->logger->info($missingCacheMessage, [
93		'class' => $localCacheClass,
94		'use' => 'local',
95		'app' => 'cli'
96		]);
97		$localCacheClass = self::NULL_CACHE;
98		} else {
99		throw new \OC\HintException(strtr($missingCacheMessage, [
100		'{class}' => $localCacheClass, '{use}' => 'local'
101		]), $missingCacheHint);
102		}
103		}
104	View Code Duplication	if (!class_exists($distributedCacheClass) \|\| !$distributedCacheClass::isAvailable()) {
105		if (\OC::$CLI && !defined('PHPUNIT_RUN')) {
106		// CLI should not hard-fail on broken memcache
107		$this->logger->info($missingCacheMessage, [
108		'class' => $distributedCacheClass,
109		'use' => 'distributed',
110		'app' => 'cli'
111		]);
112		$distributedCacheClass = self::NULL_CACHE;
113		} else {
114		throw new \OC\HintException(strtr($missingCacheMessage, [
115		'{class}' => $distributedCacheClass, '{use}' => 'distributed'
116		]), $missingCacheHint);
117		}
118		}
119		if (!($lockingCacheClass && class_exists($distributedCacheClass) && $lockingCacheClass::isAvailable())) {
		0 ignored issues – show Bug Best Practice introduced 2016-06-13 14:40 UTC by Report Bug Copy Issue Report The expression `$lockingCacheClass` of type `string\|null` is loosely compared to `false`; this is ambiguous if the string can be empty. You might want to explicitly use `=== null` instead. In PHP, under loose comparison (like `==`, or `!=`, or `switch` conditions), values of different types might be equal. For `string` values, the empty string `''` is a special case, in particular the following results might be unexpected: '' == false // true '' == null // true 'ab' == false // false 'ab' == null // false // It is often better to use strict comparison '' === false // false '' === null // false Loading history...
120		// don't fallback since the fallback might not be suitable for storing lock
121		$lockingCacheClass = self::NULL_CACHE;
122		}
123
124		$this->localCacheClass = $localCacheClass;
125		$this->distributedCacheClass = $distributedCacheClass;
126		$this->lockingCacheClass = $lockingCacheClass;
127		}
128
129		/**
130		* create a cache instance for storing locks
131		*
132		* @param string $prefix
133		* @return IMemcache
134		*/
135		public function createLocking(string $prefix = ''): IMemcache {
136		return new $this->lockingCacheClass($this->globalPrefix . '/' . $prefix);
137		}
138
139		/**
140		* create a distributed cache instance
141		*
142		* @param string $prefix
143		* @return ICache
144		*/
145		public function createDistributed(string $prefix = ''): ICache {
146		return new $this->distributedCacheClass($this->globalPrefix . '/' . $prefix);
147		}
148
149		/**
150		* create a local cache instance
151		*
152		* @param string $prefix
153		* @return ICache
154		*/
155		public function createLocal(string $prefix = ''): ICache {
156		return new $this->localCacheClass($this->globalPrefix . '/' . $prefix);
157		}
158
159		/**
160		* @see \OC\Memcache\Factory::createDistributed()
161		* @param string $prefix
162		* @return ICache
163		* @deprecated 13.0.0 Use either createLocking, createDistributed or createLocal
164		*/
165		public function create(string $prefix = ''): ICache {
166		return $this->createDistributed($prefix);
167		}
168
169		/**
170		* check memcache availability
171		*
172		* @return bool
173		*/
174		public function isAvailable(): bool {
175		return ($this->distributedCacheClass !== self::NULL_CACHE);
176		}
177
178		/**
179		* @see \OC\Memcache\Factory::createLocal()
180		* @param string $prefix
181		* @return ICache
182		*/
183		public function createLowLatency(string $prefix = ''): ICache {
184		return $this->createLocal($prefix);
185		}
186
187		/**
188		* Check if a local memory cache backend is available
189		*
190		* @return bool
191		*/
192		public function isLocalCacheAvailable(): bool {
193		return ($this->localCacheClass !== self::NULL_CACHE);
194		}
195		}
196

nextcloud / server

Pull Request — master (#8806)

Factory::createLowLatency() A

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