ClassDiscovery::getFromCache() - Code Metrics - Inspection of "bump to php 7.1 minimum" - php-http/discovery - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#140)

by David

created 2019-06-20 06:35 UTC

ClassDiscovery::getFromCache() A

↳ Parent: ClassDiscovery

Complexity

Conditions	4
Paths	4

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	3
CRAP Score	7.9062

Importance

Changes

Metric	Value
dl	0
loc	15
ccs	3
cts	8
cp	0.375
rs	9.7666
c	0
b	0
f	0
cc	4
nc	4
nop	1
crap	7.9062

<?php

namespace Http\Discovery;

use Http\Discovery\Exception\ClassInstantiationFailedException;
use Http\Discovery\Exception\DiscoveryFailedException;
use Http\Discovery\Exception\NoCandidateFoundException;
use Http\Discovery\Exception\StrategyUnavailableException;

/**
 * Registry that based find results on class existence.
 *
 * @author David de Boer <[email protected]>
 * @author Márk Sági-Kazár <[email protected]>
 * @author Tobias Nyholm <[email protected]>
 */
abstract class ClassDiscovery
{
    /**
     * A list of strategies to find classes.
     *
     * @var array
     */
    private static $strategies = [
        Strategy\PuliBetaStrategy::class,
        Strategy\CommonClassesStrategy::class,
        Strategy\CommonPsr17ClassesStrategy::class,
    ];

    /**
     * Discovery cache to make the second time we use discovery faster.
     *
     * @var array
     */
    private static $cache = [];

    /**
     * Finds a class.
     *
     * @param string $type
     *
     * @return string|\Closure
     *
     * @throws DiscoveryFailedException
     */
    protected static function findOneByType($type)
    {
        // Look in the cache
        if (null !== ($class = self::getFromCache($type))) {
            return $class;
        }

        $exceptions = [];
        foreach (self::$strategies as $strategy) {
            try {
                $candidates = call_user_func($strategy.'::getCandidates', $type);
            } catch (StrategyUnavailableException $e) {
                $exceptions[] = $e;

                continue;
            }

            foreach ($candidates as $candidate) {
                if (isset($candidate['condition'])) {
                    if (!self::evaluateCondition($candidate['condition'])) {
                        continue;
                    }
                }

                // save the result for later use
                self::storeInCache($type, $candidate);

                return $candidate['class'];
            }

            $exceptions[] = new NoCandidateFoundException($strategy, $candidates);
        }

        throw DiscoveryFailedException::create($exceptions);
    }

    /**
     * Get a value from cache.
     *
     * @param string $type
     *
     * @return string|null
     */
    private static function getFromCache($type)
    {
        if (!isset(self::$cache[$type])) {
            return;
        }

        $candidate = self::$cache[$type];
        if (isset($candidate['condition'])) {
            if (!self::evaluateCondition($candidate['condition'])) {
                return;
            }
        }

        return $candidate['class'];
    }

    /**
     * Store a value in cache.
     *
     * @param string $type
     * @param string $class
     */
    private static function storeInCache($type, $class)
    {
        self::$cache[$type] = $class;
    }

    /**
     * Set new strategies and clear the cache.
     *
     * @param array $strategies string array of fully qualified class name to a DiscoveryStrategy
     */
    public static function setStrategies(array $strategies)
    {
        self::$strategies = $strategies;
        self::clearCache();
    }

    /**
     * Append a strategy at the end of the strategy queue.
     *
     * @param string $strategy Fully qualified class name to a DiscoveryStrategy
     */
    public static function appendStrategy($strategy)
    {
        self::$strategies[] = $strategy;
        self::clearCache();
    }

    /**
     * Prepend a strategy at the beginning of the strategy queue.
     *
     * @param string $strategy Fully qualified class name to a DiscoveryStrategy
     */
    public static function prependStrategy($strategy)
    {
        array_unshift(self::$strategies, $strategy);
        self::clearCache();
    }

    /**
     * Clear the cache.
     */
    public static function clearCache()
    {
        self::$cache = [];
    }

    /**
     * Evaluates conditions to boolean.
     *
     * @param mixed $condition
     *
     * @return bool
     */
    protected static function evaluateCondition($condition)
    {
        if (is_string($condition)) {
            // Should be extended for functions, extensions???
            return self::safeClassExists($condition);
        }
        if (is_callable($condition)) {
            return (bool) $condition();
        }
        if (is_bool($condition)) {
            return $condition;
        }
        if (is_array($condition)) {
            foreach ($condition as $c) {
                if (false === static::evaluateCondition($c)) {
                    // Immediately stop execution if the condition is false
                    return false;
                }
            }

            return true;
        }

        return false;
    }

    /**
     * Get an instance of the $class.
     *
     * @param string|\Closure $class A FQCN of a class or a closure that instantiate the class.
     *
     * @return object
     *
     * @throws ClassInstantiationFailedException
     */
    protected static function instantiateClass($class)
    {
        try {
            if (is_string($class)) {
                return new $class();
            }

            if (is_callable($class)) {
                return $class();
            }
        } catch (\Exception $e) {
            throw new ClassInstantiationFailedException('Unexpected exception when instantiating class.', 0, $e);
        }

        throw new ClassInstantiationFailedException('Could not instantiate class because parameter is neither a callable nor a string');
    }

    /**
     * We want to do a "safe" version of PHP's "class_exists" because Magento has a bug
     * (or they call it a "feature"). Magento is throwing an exception if you do class_exists()
     * on a class that ends with "Factory" and if that file does not exits.
     *
     * This function will catch all potential exceptions and make sure it returns a boolean.
     *
     * @param string $class
     * @param bool   $autoload
/**
 * @param array $germany
 * @param array $island
 * @param array $italy
 */
function finale($germany, $island) {
    return "2:1";
}
     *
     * @return bool
     */
    public static function safeClassExists($class)
    {
        try {
            return class_exists($class);
        } catch (\Exception $e) {
            return false;
        }
    }
}


1		<?php
2
3		namespace Http\Discovery;
4
5		use Http\Discovery\Exception\ClassInstantiationFailedException;
6		use Http\Discovery\Exception\DiscoveryFailedException;
7		use Http\Discovery\Exception\NoCandidateFoundException;
8		use Http\Discovery\Exception\StrategyUnavailableException;
9
10		/**
11		* Registry that based find results on class existence.
12		*
13		* @author David de Boer <[email protected]>
14		* @author Márk Sági-Kazár <[email protected]>
15		* @author Tobias Nyholm <[email protected]>
16		*/
17		abstract class ClassDiscovery
18		{
19		/**
20		* A list of strategies to find classes.
21		*
22		* @var array
23		*/
24		private static $strategies = [
25		Strategy\PuliBetaStrategy::class,
26		Strategy\CommonClassesStrategy::class,
27		Strategy\CommonPsr17ClassesStrategy::class,
28		];
29
30		/**
31		* Discovery cache to make the second time we use discovery faster.
32		*
33		* @var array
34		*/
35		private static $cache = [];
36
37		/**
38		* Finds a class.
39		*
40		* @param string $type
41		*
42		* @return string\|\Closure
43		*
44		* @throws DiscoveryFailedException
45		*/
46	15	protected static function findOneByType($type)
47		{
48		// Look in the cache
49	15	if (null !== ($class = self::getFromCache($type))) {
50		return $class;
51		}
52
53	15	$exceptions = [];
54	15	foreach (self::$strategies as $strategy) {
55		try {
56	15	$candidates = call_user_func($strategy.'::getCandidates', $type);
57		} catch (StrategyUnavailableException $e) {
58		$exceptions[] = $e;
59
60		continue;
61		}
62
63	15	foreach ($candidates as $candidate) {
64	9	if (isset($candidate['condition'])) {
65	7	if (!self::evaluateCondition($candidate['condition'])) {
66	1	continue;
67		}
68		}
69
70		// save the result for later use
71	9	self::storeInCache($type, $candidate);
72
73	9	return $candidate['class'];
74		}
75
76	7	$exceptions[] = new NoCandidateFoundException($strategy, $candidates);
77		}
78
79	6	throw DiscoveryFailedException::create($exceptions);
80		}
81
82		/**
83		* Get a value from cache.
84		*
85		* @param string $type
86		*
87		* @return string\|null
88		*/
89	15	private static function getFromCache($type)
90		{
91	15	if (!isset(self::$cache[$type])) {
92	15	return;
93		}
94
95		$candidate = self::$cache[$type];
96		if (isset($candidate['condition'])) {
97		if (!self::evaluateCondition($candidate['condition'])) {
98		return;
99		}
100		}
101
102		return $candidate['class'];
103		}
104
105		/**
106		* Store a value in cache.
107		*
108		* @param string $type
109		* @param string $class
110		*/
111	9	private static function storeInCache($type, $class)
112		{
113	9	self::$cache[$type] = $class;
114	9	}
115
116		/**
117		* Set new strategies and clear the cache.
118		*
119		* @param array $strategies string array of fully qualified class name to a DiscoveryStrategy
120		*/
121	28	public static function setStrategies(array $strategies)
122		{
123	28	self::$strategies = $strategies;
124	28	self::clearCache();
125	28	}
126
127		/**
128		* Append a strategy at the end of the strategy queue.
129		*
130		* @param string $strategy Fully qualified class name to a DiscoveryStrategy
131		*/
132	1	public static function appendStrategy($strategy)
133		{
134	1	self::$strategies[] = $strategy;
135	1	self::clearCache();
136	1	}
137
138		/**
139		* Prepend a strategy at the beginning of the strategy queue.
140		*
141		* @param string $strategy Fully qualified class name to a DiscoveryStrategy
142		*/
143	1	public static function prependStrategy($strategy)
144		{
145	1	array_unshift(self::$strategies, $strategy);
146	1	self::clearCache();
147	1	}
148
149		/**
150		* Clear the cache.
151		*/
152	28	public static function clearCache()
153		{
154	28	self::$cache = [];
155	28	}
156
157		/**
158		* Evaluates conditions to boolean.
159		*
160		* @param mixed $condition
161		*
162		* @return bool
163		*/
164	7	protected static function evaluateCondition($condition)
165		{
166	7	if (is_string($condition)) {
167		// Should be extended for functions, extensions???
168		return self::safeClassExists($condition);
169		}
170	7	if (is_callable($condition)) {
171		return (bool) $condition();
172		}
173	7	if (is_bool($condition)) {
174	7	return $condition;
175		}
176	1	if (is_array($condition)) {
177	1	foreach ($condition as $c) {
178	1	if (false === static::evaluateCondition($c)) {
179		// Immediately stop execution if the condition is false
180	1	return false;
181		}
182		}
183
184		return true;
185		}
186
187		return false;
188		}
189
190		/**
191		* Get an instance of the $class.
192		*
193		* @param string\|\Closure $class A FQCN of a class or a closure that instantiate the class.
194		*
195		* @return object
196		*
197		* @throws ClassInstantiationFailedException
198		*/
199	5	protected static function instantiateClass($class)
200		{
201		try {
202	5	if (is_string($class)) {
203	5	return new $class();
204		}
205
206		if (is_callable($class)) {
207		return $class();
208		}
209		} catch (\Exception $e) {
210		throw new ClassInstantiationFailedException('Unexpected exception when instantiating class.', 0, $e);
211		}
212
213		throw new ClassInstantiationFailedException('Could not instantiate class because parameter is neither a callable nor a string');
214		}
215
216		/**
217		* We want to do a "safe" version of PHP's "class_exists" because Magento has a bug
218		* (or they call it a "feature"). Magento is throwing an exception if you do class_exists()
219		* on a class that ends with "Factory" and if that file does not exits.
220		*
221		* This function will catch all potential exceptions and make sure it returns a boolean.
222		*
223		* @param string $class
224		* @param bool $autoload
		0 ignored issues – show Bug introduced 2018-08-17 12:15 UTC by Report Bug Copy Issue Report There is no parameter named `$autoload`. Was it maybe removed? This check looks for PHPDoc comments describing methods or function parameters that do not exist on the corresponding method or function. Consider the following example. The parameter `$italy` is not defined by the method `finale(...)`. /** * @param array $germany * @param array $island * @param array $italy */ function finale($germany, $island) { return "2:1"; } The most likely cause is that the parameter was removed, but the annotation was not. Loading history...
225		*
226		* @return bool
227		*/
228		public static function safeClassExists($class)
229		{
230		try {
231		return class_exists($class);
232		} catch (\Exception $e) {
233		return false;
234		}
235		}
236		}
237

php-http / discovery

Pull Request — master (#140)

ClassDiscovery::getFromCache() A

Complexity

Size

Duplication

Code Coverage

Importance

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