Cache::getMultiple() - Code Metrics - Inspection of "Merge pull request #6 from djsmithme/psr-simple-ca..." - djsmithme/Cache - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 00fae0...ee941a )

by Dan

created 2017-03-21 15:12 UTC

Cache::getMultiple() A

↳ Parent: Cache

Complexity

Conditions	3
Paths	3

Size

Total Lines	12
Code Lines	7

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	7
CRAP Score	3

Importance

Changes

Metric	Value
dl	0
loc	12
ccs	7
cts	7
cp	1
rs	9.4285
c	0
b	0
f	0
cc	3
eloc	7
nc	3
nop	2
crap	3

<?php
/**
 * Src/Cache/Cache.php
 *
 * @package     Ds\Cache
 * @subpackage  Cache
 * @author      Dan Smith <[email protected]>
 * @version     v.1 (20/03/2017)
 * @copyright   Copyright (c) 2017, Dan Smith
 */
namespace Ds\Cache;

use \iterable;
use Psr\SimpleCache\CacheInterface as SimpleCache;
use Psr\SimpleCache\DateInterval;

/**
 * PSR 16 Simple Cache Component
 *
 * @package Ds\Cache
 */
class Cache extends AbstractCache implements SimpleCache
{
    /**
     * Persists data in the cache, uniquely referenced by a key with an optional expiration TTL time.
     *
     * @param string                $key   The key of the item to store.
     * @param mixed                 $value The value of the item to store, must be serializable.
     * @param null|int|\DateInterval $ttl   Optional. The TTL value of this item. If no value is sent and
     *                                     the driver supports TTL then the library may set a default value
     *                                     for it or let the driver take care of that.
     *
     * @return bool True on success and false on failure.
     *
     * @throws \Psr\SimpleCache\InvalidArgumentException
     *   MUST be thrown if the $key string is not a legal value.
     */
    public function set($key, $value, $ttl = null)
    {
        //convert to timestamp from now.
        if ($ttl instanceof \DateInterval){
            $dateTime = new \DateTime();
            $dateTime->add( $ttl );
            $ttl = $dateTime->getTimestamp() - time();
        }

        if (!is_int($ttl) ||  $ttl === null){
            throw new InvalidArgumentException('$ttl can only be an instance of \DateInterval, int or null');
        }

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

    /**
     * Determines whether an item is present in the cache.
     *
     * NOTE: It is recommended that has() is only to be used for cache warming type purposes
     * and not to be used within your live applications operations for get/set, as this method
     * is subject to a race condition where your has() will return true and immediately after,
     * another script can remove it making the state of your app out of date.
     *
     * @param string $key The cache item key.
     *
     * @return bool
     *
     * @throws \Psr\SimpleCache\InvalidArgumentException
     *   MUST be thrown if the $key string is not a legal value.
     */
    public function has($key)
    {
        $this->_isValidKey($key);
        return $this->cache->has($key);
    }

    /**
     * Fetches a value from the cache.
     *
     * @param string $key     The unique key of this item in the cache.
     * @param mixed  $default Default value to return if the key does not exist.
     *
     * @return mixed The value of the item from the cache, or $default in case of cache miss.
     *
     * @throws \Psr\SimpleCache\InvalidArgumentException
     *   MUST be thrown if the $key string is not a legal value.
     */
    public function get($key, $default = null)
    {
        $this->_isValidKey($key);

        if ($this->cache->has($key)){
            return $this->cache->get($key);
        }

        return $default;
    }

    /**
     * Delete an item from the cache by its unique key.
     *
     * @param string $key The unique cache key of the item to delete.
     *
     * @return bool True if the item was successfully removed. False if there was an error.
     *
     * @throws \Psr\SimpleCache\InvalidArgumentException
     *   MUST be thrown if the $key string is not a legal value.
     */
    public function delete($key)
    {
        $this->_isValidKey($key);
        return $this->cache->delete($key);
    }


    /**
     * Obtains multiple cache items by their unique keys.
     *
     * @param iterable $keys    A list of keys that can obtained in a single operation.
     * @param mixed    $default Default value to return for keys that do not exist.
     *
     * @return iterable A list of key => value pairs. Cache keys that do not exist or are stale will have $default as value.
     *
     * @throws \Psr\SimpleCache\InvalidArgumentException
     *   MUST be thrown if $keys is neither an array nor a Traversable,
     *   or if any of the $keys are not a legal value.
     */
    public function getMultiple($keys, $default = null)
    {
        $this->_checkTraversable($keys);
        $result = [];

        foreach ((array)$keys as $key){
            $cachedItem = $this->cache->get($key);
            $result[$key] = (null !== $cachedItem) ? $cachedItem : $default;
        }

        return (array)$result;
class Author {
    private $name;

    public function __construct($name) {
        $this->name = $name;
    }

    public function getName() {
        return $this->name;
    }
}

abstract class Post {
    public function getAuthor() {
        return 'Johannes';
    }
}

class BlogPost extends Post {
    public function getAuthor() {
        return new Author('Johannes');
    }
}

class ForumPost extends Post { /* ... */ }

function my_function(Post $post) {
    echo strtoupper($post->getAuthor());
}
    }

    /**
     * Persists a set of key => value pairs in the cache, with an optional TTL.
     *
     * @param iterable              $values A list of key => value pairs for a multiple-set operation.
     * @param null|int|DateInterval $ttl    Optional. The TTL value of this item. If no value is sent and
     *                                      the driver supports TTL then the library may set a default value
     *                                      for it or let the driver take care of that.
     *
     * @return bool True on success and false on failure.
     *
     * @throws \Psr\SimpleCache\InvalidArgumentException
     *   MUST be thrown if $values is neither an array nor a Traversable,
     *   or if any of the $values are not a legal value.
     */
    public function setMultiple($values, $ttl = null)
    {
        $this->_checkTraversable($values);
        $results = [];

        foreach ((array)$values as $key => $value){
            $results[] = $this->cache->set($key, $value, $ttl);
        }

        if ($this->_hasFailure($results)){
            return false;
        }

        return true;
    }

    /**
     * Deletes multiple cache items in a single operation.
     *
     * @param iterable $keys A list of string-based keys to be deleted.
     *
     * @return bool True if the items were successfully removed. False if there was an error.
     *
     * @throws \Psr\SimpleCache\InvalidArgumentException
     *   MUST be thrown if $keys is neither an array nor a Traversable,
     *   or if any of the $keys are not a legal value.
     */
    public function deleteMultiple($keys)
    {
        $this->_checkTraversable($keys);
        $results = [];

        foreach ((array)$keys as $key){
            $results[] = $this->cache->delete($key);
        }

        if ($this->_hasFailure($results)){
            return false;
        }

        return true;
    }

    /**
     * Wipes clean the entire cache's keys.
     *
     * @return bool True on success and false on failure.
     */
    public function clear()
    {
        return $this->cache->clear();
    }

    /**
     * Check that provided key is valid.
     *
     * @param $key
     * @throws InvalidArgumentException
     */
    private function _isValidKey($key){
        if (!is_string($key)){
            throw new InvalidArgumentException('provided key must be a valid string');
        }
    }

    private function isAssoc(array $arr)

    {
        if (array() === $arr){
            return false;
        }
        return array_keys($arr) !== range(0, count($arr) - 1);
    }

    /**
     * Check that $keys are traversable
     *
     * @param $data
     * @throws InvalidArgumentException
     * @internal
     */
    private function _checkTraversable($data){

        if (is_array($data)){
            return;
        }

        if ($data instanceof \Traversable ){
            return;
        }

        throw new InvalidArgumentException('Keys must be traversable, in key=>value format');
    }

    /**
     * Check for failures when adding multiple entries.
     *
     * @param array $results
     * @return bool
     * @internal
     */
    private function _hasFailure(array $results){
        if (in_array(false, $results)){
            return true;
        }
        return false;
    }
}


1		<?php
2		/**
3		* Src/Cache/Cache.php
4		*
5		* @package Ds\Cache
6		* @subpackage Cache
7		* @author Dan Smith <[email protected]>
8		* @version v.1 (20/03/2017)
9		* @copyright Copyright (c) 2017, Dan Smith
10		*/
11		namespace Ds\Cache;
12
13		use \iterable;
14		use Psr\SimpleCache\CacheInterface as SimpleCache;
15		use Psr\SimpleCache\DateInterval;
16
17		/**
18		* PSR 16 Simple Cache Component
19		*
20		* @package Ds\Cache
21		*/
22		class Cache extends AbstractCache implements SimpleCache
23		{
24		/**
25		* Persists data in the cache, uniquely referenced by a key with an optional expiration TTL time.
26		*
27		* @param string $key The key of the item to store.
28		* @param mixed $value The value of the item to store, must be serializable.
29		* @param null\|int\|\DateInterval $ttl Optional. The TTL value of this item. If no value is sent and
30		* the driver supports TTL then the library may set a default value
31		* for it or let the driver take care of that.
32		*
33		* @return bool True on success and false on failure.
34		*
35		* @throws \Psr\SimpleCache\InvalidArgumentException
36		* MUST be thrown if the $key string is not a legal value.
37		*/
38	3	public function set($key, $value, $ttl = null)
39		{
40		//convert to timestamp from now.
41	3	if ($ttl instanceof \DateInterval){
42	1	$dateTime = new \DateTime();
43	1	$dateTime->add( $ttl );
44	1	$ttl = $dateTime->getTimestamp() - time();
45		}
46
47	3	if (!is_int($ttl) \|\| $ttl === null){
48	1	throw new InvalidArgumentException('$ttl can only be an instance of \DateInterval, int or null');
49		}
50
51	2	return $this->cache->set($key, $value, $ttl);
52		}
53
54		/**
55		* Determines whether an item is present in the cache.
56		*
57		* NOTE: It is recommended that has() is only to be used for cache warming type purposes
58		* and not to be used within your live applications operations for get/set, as this method
59		* is subject to a race condition where your has() will return true and immediately after,
60		* another script can remove it making the state of your app out of date.
61		*
62		* @param string $key The cache item key.
63		*
64		* @return bool
65		*
66		* @throws \Psr\SimpleCache\InvalidArgumentException
67		* MUST be thrown if the $key string is not a legal value.
68		*/
69	3	public function has($key)
70		{
71	3	$this->_isValidKey($key);
72	2	return $this->cache->has($key);
73		}
74
75		/**
76		* Fetches a value from the cache.
77		*
78		* @param string $key The unique key of this item in the cache.
79		* @param mixed $default Default value to return if the key does not exist.
80		*
81		* @return mixed The value of the item from the cache, or $default in case of cache miss.
82		*
83		* @throws \Psr\SimpleCache\InvalidArgumentException
84		* MUST be thrown if the $key string is not a legal value.
85		*/
86	3	public function get($key, $default = null)
87		{
88	3	$this->_isValidKey($key);
89
90	2	if ($this->cache->has($key)){
91	1	return $this->cache->get($key);
92		}
93
94	1	return $default;
95		}
96
97		/**
98		* Delete an item from the cache by its unique key.
99		*
100		* @param string $key The unique cache key of the item to delete.
101		*
102		* @return bool True if the item was successfully removed. False if there was an error.
103		*
104		* @throws \Psr\SimpleCache\InvalidArgumentException
105		* MUST be thrown if the $key string is not a legal value.
106		*/
107	1	public function delete($key)
108		{
109	1	$this->_isValidKey($key);
110	1	return $this->cache->delete($key);
111		}
112
113
114		/**
115		* Obtains multiple cache items by their unique keys.
116		*
117		* @param iterable $keys A list of keys that can obtained in a single operation.
118		* @param mixed $default Default value to return for keys that do not exist.
119		*
120		* @return iterable A list of key => value pairs. Cache keys that do not exist or are stale will have $default as value.
121		*
122		* @throws \Psr\SimpleCache\InvalidArgumentException
123		* MUST be thrown if $keys is neither an array nor a Traversable,
124		* or if any of the $keys are not a legal value.
125		*/
126	1	public function getMultiple($keys, $default = null)
127		{
128	1	$this->_checkTraversable($keys);
129	1	$result = [];
130
131	1	foreach ((array)$keys as $key){
132	1	$cachedItem = $this->cache->get($key);
133	1	$result[$key] = (null !== $cachedItem) ? $cachedItem : $default;
134		}
135
136	1	return (array)$result;
		0 ignored issues – show Bug Best Practice introduced 2017-03-21 15:27 UTC by Report Bug Copy Issue Report The return type of `return (array) $result;` (`array`) is incompatible with the return type declared by the interface `Psr\SimpleCache\CacheInterface::getMultiple` of type `Psr\SimpleCache\iterable`. If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design. Let’s take a look at an example: class Author { private $name; public function __construct($name) { $this->name = $name; } public function getName() { return $this->name; } } abstract class Post { public function getAuthor() { return 'Johannes'; } } class BlogPost extends Post { public function getAuthor() { return new Author('Johannes'); } } class ForumPost extends Post { /* ... */ } function my_function(Post $post) { echo strtoupper($post->getAuthor()); } Our function `my_function` expects a `Post` object, and outputs the author of the post. The base class `Post` returns a simple string and outputting a simple string will work just fine. However, the child class `BlogPost` which is a sub-type of `Post` instead decided to return an `object`, and is therefore violating the SOLID principles. If a `BlogPost` were passed to `my_function`, PHP would not complain, but ultimately fail when executing the `strtoupper` call in its body. Loading history...
137		}
138
139		/**
140		* Persists a set of key => value pairs in the cache, with an optional TTL.
141		*
142		* @param iterable $values A list of key => value pairs for a multiple-set operation.
143		* @param null\|int\|DateInterval $ttl Optional. The TTL value of this item. If no value is sent and
144		* the driver supports TTL then the library may set a default value
145		* for it or let the driver take care of that.
146		*
147		* @return bool True on success and false on failure.
148		*
149		* @throws \Psr\SimpleCache\InvalidArgumentException
150		* MUST be thrown if $values is neither an array nor a Traversable,
151		* or if any of the $values are not a legal value.
152		*/
153	1	public function setMultiple($values, $ttl = null)
154		{
155	1	$this->_checkTraversable($values);
156	1	$results = [];
157
158	1	foreach ((array)$values as $key => $value){
159	1	$results[] = $this->cache->set($key, $value, $ttl);
160		}
161
162	1	if ($this->_hasFailure($results)){
163		return false;
164		}
165
166	1	return true;
167		}
168
169		/**
170		* Deletes multiple cache items in a single operation.
171		*
172		* @param iterable $keys A list of string-based keys to be deleted.
173		*
174		* @return bool True if the items were successfully removed. False if there was an error.
175		*
176		* @throws \Psr\SimpleCache\InvalidArgumentException
177		* MUST be thrown if $keys is neither an array nor a Traversable,
178		* or if any of the $keys are not a legal value.
179		*/
180	2	public function deleteMultiple($keys)
181		{
182	2	$this->_checkTraversable($keys);
183	2	$results = [];
184
185	2	foreach ((array)$keys as $key){
186	2	$results[] = $this->cache->delete($key);
187		}
188
189	2	if ($this->_hasFailure($results)){
190	1	return false;
191		}
192
193	1	return true;
194		}
195
196		/**
197		* Wipes clean the entire cache's keys.
198		*
199		* @return bool True on success and false on failure.
200		*/
201	1	public function clear()
202		{
203	1	return $this->cache->clear();
204		}
205
206		/**
207		* Check that provided key is valid.
208		*
209		* @param $key
210		* @throws InvalidArgumentException
211		*/
212	7	private function _isValidKey($key){
213	7	if (!is_string($key)){
214	2	throw new InvalidArgumentException('provided key must be a valid string');
215		}
216	5	}
217
218		private function isAssoc(array $arr)
		0 ignored issues – show Unused Code introduced 2017-03-21 15:27 UTC by Report Bug Copy Issue Report This method is not used, and could be removed. Loading history...
219		{
220		if (array() === $arr){
221		return false;
222		}
223		return array_keys($arr) !== range(0, count($arr) - 1);
224		}
225
226		/**
227		* Check that $keys are traversable
228		*
229		* @param $data
230		* @throws InvalidArgumentException
231		* @internal
232		*/
233	4	private function _checkTraversable($data){
234
235	4	if (is_array($data)){
236	4	return;
237		}
238
239		if ($data instanceof \Traversable ){
240		return;
241		}
242
243		throw new InvalidArgumentException('Keys must be traversable, in key=>value format');
244		}
245
246		/**
247		* Check for failures when adding multiple entries.
248		*
249		* @param array $results
250		* @return bool
251		* @internal
252		*/
253	3	private function _hasFailure(array $results){
254	3	if (in_array(false, $results)){
255	1	return true;
256		}
257	2	return false;
258		}
259		}
260

djsmithme / Cache

Push — master ( 00fae0...ee941a )

Cache::getMultiple() A

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Duplication

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