Cache::__construct() - Code Metrics - Inspection of "Refactoring CacheInterface and add early expiratio..." - yiisoft/cache - Measure and Improve Code Quality continuously with Scrutinizer

Test Failed

Pull Request — master (#74)

by Evgeniy

created 2020-12-11 18:15 UTC

Cache::__construct() A

↳ Parent: Cache

Complexity

Conditions	1
Paths	1

Size

Total Lines	7
Code Lines	5

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	3
CRAP Score	1

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
eloc	5
c	1
b	0
f	0
dl	0
loc	7
rs	10
ccs	3
cts	3
cp	1
cc	1
nc	1
nop	3
crap	1

<?php

declare(strict_types=1);

namespace Yiisoft\Cache;

use DateInterval;
use DateTime;
use InvalidArgumentException;
use Yiisoft\Cache\Dependency\Dependency;
use Yiisoft\Cache\Exception\SetCacheException;
use Yiisoft\Cache\Metadata\CacheItems;

use function gettype;
use function is_array;
use function is_int;

/**
 * Cache provides support for the data caching, including cache key composition and dependencies.
 * The actual data caching is performed via {@see Cache::$handler}, which should be configured
 * to be {@see \Psr\SimpleCache\CacheInterface} instance.
 *
 * A value can be stored in the cache by calling {@see CacheInterface::set()} and be retrieved back
 * later (in the same or different request) by {@see CacheInterface::get()}. In both operations,
 * a key identifying the value is required. An expiration time and/or a {@see Dependency}
 * can also be specified when calling {@see CacheInterface::set()}. If the value expires or the dependency
 * changes at the time of calling {@see CacheInterface::get()}, the cache will return no data.
 *
 * A typical usage pattern of cache is like the following:
 *
 * ```php
 * $key = 'demo';
 * $data = $cache->get($key);
 * if ($data === null) {
 *     // ...generate $data here...
 *     $cache->set($key, $data, $ttl, $dependency);
 * }
 * ```
 *
 * For more details and usage information on Cache, see
 * [PSR-16 specification](https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-16-simple-cache.md).
 */
final class Cache implements CacheInterface
{
    /**
     * @var \Psr\SimpleCache\CacheInterface actual cache handler.
     */
    private \Psr\SimpleCache\CacheInterface $handler;

    private CacheItems $metadata;
    private CacheKeyNormalizer $keyNormalizer;

    /**
     * @var string a string prefixed to every cache key so that it is unique globally in the whole cache storage.
     * It is recommended that you set a unique cache key prefix for each application if the same cache
     * storage is being used by different applications.
     */
    private string $keyPrefix;

    /**
     * @var int|null default TTL for a cache entry. null meaning infinity, negative or zero results in cache key deletion.
     * This value is used by {@see set()} and {@see setMultiple()}, if the duration is not explicitly given.
     */
    private ?int $defaultTtl;

    /**
     * @param \Psr\SimpleCache\CacheInterface $handler
     * @param DateInterval|int|null $defaultTtl
     * @param string $keyPrefix
     */
    public function __construct(\Psr\SimpleCache\CacheInterface $handler, $defaultTtl = null, string $keyPrefix = '')
    {
        $this->handler = $handler;
        $this->metadata = new CacheItems();
        $this->keyNormalizer = new CacheKeyNormalizer();
        $this->keyPrefix = $keyPrefix;
        $this->defaultTtl = $this->normalizeTtl($defaultTtl);
    }

    public function getOrSet($key, callable $callable, $ttl = null, Dependency $dependency = null, float $beta = 1.0)
    {
        $key = $this->buildKey($key);

        if (!$this->metadata->expired($key, $beta)) {
            $value = $this->getValueOrDefaultIfDependencyChanged($this->handler->get($key));

            if ($value !== null) {
                return $value;
            }
        }

        $ttl = ($ttl = $this->normalizeTtl($ttl)) ?? $this->defaultTtl;

        $value = $this->addDependencyToValue($callable, $dependency);

        if (!$this->handler->set($key, $value, $ttl)) {
            throw new SetCacheException($key, $value, $this);
        }

        $this->metadata->set($key, $ttl);
        return $value;
    }

    public function remove($key): bool
    {
        $key = $this->buildKey($key);

        if ($this->handler->delete($key)) {
            $this->metadata->remove($key);
            return true;
        }

        return false;
    }

    public function clear(): bool
    {
        if ($this->handler->clear()) {
            $this->metadata->clear();
            return true;
        }

        return false;
    }

    /**
     * Returns array of value and dependency or just value if dependency is null.
     *
     * @param callable $callable
     * @param Dependency|null $dependency
     *
     * @return mixed
     */
    private function addDependencyToValue(callable $callable, ?Dependency $dependency)
    {
        $value = $callable($this);

        if ($dependency === null) {
            return $value;
        }

        $dependency->evaluateDependency($this);
        return [$value, $dependency];
    }

    /**
     * Returns value if there is no dependency or it has not been changed and default value otherwise.
     *
     * @param mixed $value
     *
     * @return mixed
     */
    private function getValueOrDefaultIfDependencyChanged($value)
    {
        if (is_array($value) && isset($value[1]) && $value[1] instanceof Dependency) {
            /** @var Dependency $dependency */
            [$value, $dependency] = $value;

            if ($dependency->isChanged($this)) {
                return null;
            }
        }

        return $value;
    }

    /**
     * Builds a normalized cache key from a given key by appending key prefix.
     *
     * @param mixed $key The key to be normalized.
     *
     * @return string The generated cache key.
     */
    private function buildKey($key): string
    {
        return $this->keyPrefix . $this->keyNormalizer->normalize($key);
    }

    /**
     * Normalizes cache TTL handling `null` value and {@see DateInterval} objects.
     *
     * @param DateInterval|int|null $ttl raw TTL.
     *
     * @throws InvalidArgumentException For invalid TTL.
     *
     * @return int|null TTL value as UNIX timestamp or null meaning infinity.
     */
    private function normalizeTtl($ttl): ?int
    {
        if ($ttl === null) {
            return null;
        }

        if ($ttl instanceof DateInterval) {
            return (new DateTime('@0'))->add($ttl)->getTimestamp();
        }

        if (is_int($ttl)) {

            return $ttl;
        }

        throw new InvalidArgumentException(sprintf(
            'Invalid TTL "%s" specified. It must be a \DateInterval instance, an integer, or null.',
            gettype($ttl),
        ));
    }
}


1		<?php
2
3		declare(strict_types=1);
4
5		namespace Yiisoft\Cache;
6
7		use DateInterval;
8		use DateTime;
9		use InvalidArgumentException;
10		use Yiisoft\Cache\Dependency\Dependency;
11		use Yiisoft\Cache\Exception\SetCacheException;
12		use Yiisoft\Cache\Metadata\CacheItems;
13
14		use function gettype;
15		use function is_array;
16		use function is_int;
17
18		/**
19		* Cache provides support for the data caching, including cache key composition and dependencies.
20		* The actual data caching is performed via {@see Cache::$handler}, which should be configured
21		* to be {@see \Psr\SimpleCache\CacheInterface} instance.
22		*
23		* A value can be stored in the cache by calling {@see CacheInterface::set()} and be retrieved back
24		* later (in the same or different request) by {@see CacheInterface::get()}. In both operations,
25		* a key identifying the value is required. An expiration time and/or a {@see Dependency}
26		* can also be specified when calling {@see CacheInterface::set()}. If the value expires or the dependency
27		* changes at the time of calling {@see CacheInterface::get()}, the cache will return no data.
28		*
29		* A typical usage pattern of cache is like the following:
30		*
31		* ```php
32		* $key = 'demo';
33		* $data = $cache->get($key);
34		* if ($data === null) {
35		* // ...generate $data here...
36		* $cache->set($key, $data, $ttl, $dependency);
37		* }
38		* ```
39		*
40		* For more details and usage information on Cache, see
41		* [PSR-16 specification](https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-16-simple-cache.md).
42		*/
43		final class Cache implements CacheInterface
44		{
45		/**
46		* @var \Psr\SimpleCache\CacheInterface actual cache handler.
47		*/
48		private \Psr\SimpleCache\CacheInterface $handler;
49
50		private CacheItems $metadata;
51		private CacheKeyNormalizer $keyNormalizer;
52
53		/**
54		* @var string a string prefixed to every cache key so that it is unique globally in the whole cache storage.
55		* It is recommended that you set a unique cache key prefix for each application if the same cache
56		* storage is being used by different applications.
57		*/
58	106	private string $keyPrefix;
59
60	106	/**
61	106	* @var int\|null default TTL for a cache entry. null meaning infinity, negative or zero results in cache key deletion.
62		* This value is used by {@see set()} and {@see setMultiple()}, if the duration is not explicitly given.
63		*/
64		private ?int $defaultTtl;
65
66		/**
67		* @param \Psr\SimpleCache\CacheInterface $handler
68		* @param DateInterval\|int\|null $defaultTtl
69		* @param string $keyPrefix
70	103	*/
71		public function __construct(\Psr\SimpleCache\CacheInterface $handler, $defaultTtl = null, string $keyPrefix = '')
72	103	{
73	1	$this->handler = $handler;
74		$this->metadata = new CacheItems();
75	102	$this->keyNormalizer = new CacheKeyNormalizer();
76		$this->keyPrefix = $keyPrefix;
77		$this->defaultTtl = $this->normalizeTtl($defaultTtl);
78	81	}
79
80	81	public function getOrSet($key, callable $callable, $ttl = null, Dependency $dependency = null, float $beta = 1.0)
81	81	{
82	81	$key = $this->buildKey($key);
83
84		if (!$this->metadata->expired($key, $beta)) {
85	20	$value = $this->getValueOrDefaultIfDependencyChanged($this->handler->get($key));
86
87	20	if ($value !== null) {
88	20	return $value;
89		}
90		}
91
92		$ttl = ($ttl = $this->normalizeTtl($ttl)) ?? $this->defaultTtl;
		0 ignored issues – show Unused Code introduced 2020-12-11 17:22 UTC by Report Bug Copy Issue Report The assignment to `$ttl` is dead and can be removed. Loading history...
93		$value = $this->addDependencyToValue($callable, $dependency);
94
95		if (!$this->handler->set($key, $value, $ttl)) {
96		throw new SetCacheException($key, $value, $this);
97		}
98
99		$this->metadata->set($key, $ttl);
100		return $value;
101		}
102
103		public function remove($key): bool
104		{
105		$key = $this->buildKey($key);
106
107	16	if ($this->handler->delete($key)) {
108		$this->metadata->remove($key);
109	16	return true;
110	16	}
111	16
112	16	return false;
113		}
114
115		public function clear(): bool
116		{
117		if ($this->handler->clear()) {
118		$this->metadata->clear();
119		return true;
120		}
121
122		return false;
123		}
124
125		/**
126		* Returns array of value and dependency or just value if dependency is null.
127		*
128		* @param callable $callable
129		* @param Dependency\|null $dependency
130		*
131	92	* @return mixed
132		*/
133	92	private function addDependencyToValue(callable $callable, ?Dependency $dependency)
134	91	{
135	91	$value = $callable($this);
136	91
137		if ($dependency === null) {
138	91	return $value;
139		}
140
141		$dependency->evaluateDependency($this);
142		return [$value, $dependency];
143		}
144
145		/**
146		* Returns value if there is no dependency or it has not been changed and default value otherwise.
147		*
148		* @param mixed $value
149		*
150		* @return mixed
151		*/
152		private function getValueOrDefaultIfDependencyChanged($value)
153		{
154		if (is_array($value) && isset($value[1]) && $value[1] instanceof Dependency) {
155		/** @var Dependency $dependency */
156	19	[$value, $dependency] = $value;
157
158	19	if ($dependency->isChanged($this)) {
159	19	return null;
160	19	}
161		}
162
163	1	return $value;
164		}
165	1
166	1	/**
167		* Builds a normalized cache key from a given key by appending key prefix.
168		*
169		* @param mixed $key The key to be normalized.
170		*
171		* @return string The generated cache key.
172		*/
173		private function buildKey($key): string
174		{
175		return $this->keyPrefix . $this->keyNormalizer->normalize($key);
176		}
177
178		/**
179		* Normalizes cache TTL handling `null` value and {@see DateInterval} objects.
180		*
181		* @param DateInterval\|int\|null $ttl raw TTL.
182		*
183	1	* @throws InvalidArgumentException For invalid TTL.
184		*
185	1	* @return int\|null TTL value as UNIX timestamp or null meaning infinity.
186	1	*/
187	1	private function normalizeTtl($ttl): ?int
188		{
189	1	if ($ttl === null) {
190		return null;
191		}
192	20
193		if ($ttl instanceof DateInterval) {
194	20	return (new DateTime('@0'))->add($ttl)->getTimestamp();
195	20	}
196	20
197	20	if (is_int($ttl)) {
		0 ignored issues – show introduced 2020-12-11 17:22 UTC by Report Bug Copy Issue Report The condition `is_int($ttl)` is always `true`. Loading history...
198	20	return $ttl;
199	20	}
200
201		throw new InvalidArgumentException(sprintf(
202	20	'Invalid TTL "%s" specified. It must be a \DateInterval instance, an integer, or null.',
203		gettype($ttl),
204		));
205		}
206		}
207

yiisoft / cache

Pull Request — master (#74)

Cache::__construct() A

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