CacheData::updateDependenciesHash() - Code Metrics - Corollarium/cachearium - Measure and Improve Code Quality continuously with Scrutinizer

CacheData::updateDependenciesHash() A
last analyzed 2017-05-08 14:29 UTC

↳ Parent: CacheData

Complexity

Conditions	1
Paths	1

Size

Total Lines	4
Code Lines	3

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
dl	0
loc	4
rs	10
c	0
b	0
f	0
cc	1
eloc	3
nc	1
nop	1

<?php

namespace Cachearium;

/**
 * Class used to store cache data in start()/get();
 *
 */
class CacheData {
	const CACHEDATA_TYPE_CALLBACK = 'callback';
	const CACHEDATA_TYPE_RECURSION = 'recursion';
	const CACHEDATA_TYPE_RECURSION_DATA = 'recursiondata';
	const CACHEDATA_TYPE_DATA = 'data';

	/**
	 *
	 * @var CacheKey
	 */
	public $key;

	/**
	 * Lifetime: how long this cache should live. It's up to the storage implementation
	 * the details of how this will be obeyed, if at all.
	 * @var integer
	 */
	public $lifetime;

	/**
	 * This is a storage of dependencies for this cache. This is stored here as
	 * the russian doll model will automatically push up dependencies. In the end
	 * this will probably be used by the storage for easy invalidation.
	 *
	 * @var array:CacheKey
	 */
	public $dependencies = array();

	/**
	 * The actual cached data
	 * @var array
	 */
	public $data = array();

	private $dependenciesHash = '';

	public function __construct(CacheKey $ck, $data = null) {
		$this->setKey($ck);

		if ($data) {
			$this->appendData($data);
		}
	}

	/**
	 *
	 * @param CacheKey $ck
	 * @return CacheData
	 */
	public function setKey(CacheKey $ck) {
		$this->key = $ck;
		return $this;
	}

	/**
	 *
	 * @param unknown $callback
	 * @return CacheData
	 */
	public function appendCallback(callable $callback) {
		$this->data[] = array('type' => self::CACHEDATA_TYPE_CALLBACK, 'data' => $callback);
		return $this;
	}

	/**
	 *
	 * @param CacheData $cd
	 * @return CacheData
	 */
	public function mergeDependencies(CacheData $cd) {
		$this->dependencies = array_unique(array_merge($this->dependencies, $cd->dependencies));
		return $this;
	}

	public function clearDependenciesHash() {
		$this->dependenciesHash = '';
	}

	/**
	 * Checks if dependencies are still fresh.
	 * @param CacheAbstract $cache
	 * @return boolean
	 */
	public function checkUpdateToDate(CacheAbstract $cache) {
		// no deps? bail out
		if (!count($this->dependencies)) {
			return true;
		}
		if ($this->generateDependenciesHash($cache) == $this->dependenciesHash) {
			return true;
		}
		return false;
	}

	/**
	 * Init dependencies. If increment is not supported by backend return 0.
	 *
	 * @param CacheAbstract $cache
	 * @param CacheKey $k
	 * @return integer
	 */
	public function dependencyInit(CacheAbstract $cache, CacheKey $k) {
		try {
			return $cache->increment(0, $k, 0);
		}
		catch (\Cachearium\Exceptions\CacheUnsupportedOperation $e) {
			return 0;
		}
	}

	/**
	 * Get a fresh hash based on dependencies. Does not update the current hash.
	 * @param CacheAbstract $cache
	 * @return string
	 */
	public function generateDependenciesHash(CacheAbstract $cache) {
		if (!count($this->dependencies)) {
			return '';
		}
		$values = $cache->getMulti($this->dependencies, array($this, 'dependencyInit'));
		return md5(implode($values));
	}

	public function updateDependenciesHash(CacheAbstract $cache) {
		$this->dependenciesHash = $this->generateDependenciesHash($cache);
		return $this;
	}

	public function updateDependenciesHashIfNull(CacheAbstract $cache) {
		if (!$this->dependenciesHash) {
			$this->dependenciesHash = $this->generateDependenciesHash($cache);
		}
		return $this;
	}

	public function getKey() {
		return $this->key;
	}

	public function getDependenciesHash() {
		return $this->dependenciesHash;
	}

	public function getDependencies() {
		return $this->dependencies;
	}

	/**
	 *
	 * @param mixed $data Any kind of data you want to store. usually strings.
	 * @return CacheData
	 */
	public function appendData($data) {
		if ($data) {
			$this->data[] = array('type' => self::CACHEDATA_TYPE_DATA, 'data' => $data);
		}
		return $this;
	}

	/**
	 * Convenience function. Returns the first data self::CACHEDATA_TYPE_DATA that you
	 * stored. Returns null if there is none.
	 *
	 * @return any|NULL
	 */
	public function getFirstData() {
		foreach ($this->data as $d) {
			if ($d['type'] == self::CACHEDATA_TYPE_DATA) {
				return $d['data'];
			}
		}
		return null;
	}

	public function appendRecursion(CacheKey $k) {
		$this->addDependency($k);
		$this->data[] = array(
			'type' => self::CACHEDATA_TYPE_RECURSION,
			'data' => $k
		);
		return $this;
	}

	public function appendRecursionData(CacheData $d) {
		if (!$d->getKey()) {
			throw new Exceptions\CacheInvalidDataException();
		}
		$this->addDependency($d->getKey());
		$this->data[] = array(
			'type' => self::CACHEDATA_TYPE_RECURSION_DATA,
			'data' => $d->getKey()
		);
		return $this;
	}

	/**
	 * Adds a dependency
	 * @param CacheKey $k
	 * @return CacheData This
	 */
	public function addDependency(CacheKey $k) {
		$this->dependencies[] = $k;
		$this->clearDependenciesHash();
		return $this;
	}

	/**
	 * Adds a dependency
	 * @param array<CacheKey> $k
	 * @return CacheData This
	 */
	public function addDependencies(array $deps) {
		foreach ($deps as $k) {
			$this->addDependency($k);
		}
		return $this;
	}

	/**
	 * Sets the list of dependencies and updates the dependency hash
	 *
	 * @param array<CacheKey> $deps
	 * @param CacheAbstract $cache
	 * @return CacheData
	 */
	public function setDependencies(array $deps, CacheAbstract $cache) {
		$this->dependencies = [];
		foreach ($deps as $k) {
			$this->addDependency($k);
		}
		$this->generateDependenciesHash($cache);
		return $this;
	}

	/**
	 *
	 * @param integer $lifetime
	 * @return CacheData
	 */
	public function setLifetime($lifetime) {
		$this->lifetime = $lifetime;
		return $this;
	}

	/**
	 * Checks if a set of keys clashes with the ones used here.
	 * @param CacheKey $k
	 * @return boolean True if they match and there is a clash
	 */
	public function checkClash(CacheKey $k) {
		return ($this->key == $k);
	}

	/**
	 * Converts this data to a string that can output. This is not a hash
	 * key or a serialization, but an actual render for humans.
	 *
	 * @throws Exceptions\NotCachedException
	 */
	public function stringify(CacheAbstract $c, $recurse = true) {
		$retval = [];
		foreach ($this->data as $item) {
			if ($item['type'] == self::CACHEDATA_TYPE_CALLBACK) {
				$callback = $item['data'];
				if (is_callable($callback)) {
					$retval[] = call_user_func($callback);
				}
				else {
					// throw?
				}
			}
			else if ($item['type'] == self::CACHEDATA_TYPE_RECURSION) {
				if ($recurse) {
					$retval[] = $c->get($item['data']);
				}
			}
			else if ($item['type'] == self::CACHEDATA_TYPE_RECURSION_DATA) {
				if ($recurse) {
					$data = $c->getData($item['data']);
					$retval[] = $data->stringify($c);
				}
			}
			else {
				$retval[] = $item['data'];
			}
		}

		return implode('', $retval);
	}

	/**
	 * Serialize this object to a string so we can easily store.
	 *
	 * @return string
	 */
	public function serialize() {
		return serialize($this);
	}

	/**
	 * Unserializes data and returns a new CacheData. This is what you
	 * should use to get the object data from the storage.
	 *
	 * @param string $data
	 * @return CacheData
	 */
	static public function unserialize($data) {
		return unserialize($data);
	}
}


1			<?php
2
3			namespace Cachearium;
4
5			/**
6			* Class used to store cache data in start()/get();
7			*
8			*/
9			class CacheData {
10			const CACHEDATA_TYPE_CALLBACK = 'callback';
11			const CACHEDATA_TYPE_RECURSION = 'recursion';
12			const CACHEDATA_TYPE_RECURSION_DATA = 'recursiondata';
13			const CACHEDATA_TYPE_DATA = 'data';
14
15			/**
16			*
17			* @var CacheKey
18			*/
19			public $key;
20
21			/**
22			* Lifetime: how long this cache should live. It's up to the storage implementation
23			* the details of how this will be obeyed, if at all.
24			* @var integer
25			*/
26			public $lifetime;
27
28			/**
29			* This is a storage of dependencies for this cache. This is stored here as
30			* the russian doll model will automatically push up dependencies. In the end
31			* this will probably be used by the storage for easy invalidation.
32			*
33			* @var array:CacheKey
34			*/
35			public $dependencies = array();
36
37			/**
38			* The actual cached data
39			* @var array
40			*/
41			public $data = array();
42
43			private $dependenciesHash = '';
44
45			public function __construct(CacheKey $ck, $data = null) {
46			$this->setKey($ck);
47
48			if ($data) {
49			$this->appendData($data);
50			}
51			}
52
53			/**
54			*
55			* @param CacheKey $ck
56			* @return CacheData
57			*/
58			public function setKey(CacheKey $ck) {
59			$this->key = $ck;
60			return $this;
61			}
62
63			/**
64			*
65			* @param unknown $callback
66			* @return CacheData
67			*/
68			public function appendCallback(callable $callback) {
69			$this->data[] = array('type' => self::CACHEDATA_TYPE_CALLBACK, 'data' => $callback);
70			return $this;
71			}
72
73			/**
74			*
75			* @param CacheData $cd
76			* @return CacheData
77			*/
78			public function mergeDependencies(CacheData $cd) {
79			$this->dependencies = array_unique(array_merge($this->dependencies, $cd->dependencies));
80			return $this;
81			}
82
83			public function clearDependenciesHash() {
84			$this->dependenciesHash = '';
85			}
86
87			/**
88			* Checks if dependencies are still fresh.
89			* @param CacheAbstract $cache
90			* @return boolean
91			*/
92			public function checkUpdateToDate(CacheAbstract $cache) {
93			// no deps? bail out
94			if (!count($this->dependencies)) {
95			return true;
96			}
97			if ($this->generateDependenciesHash($cache) == $this->dependenciesHash) {
98			return true;
99			}
100			return false;
101			}
102
103			/**
104			* Init dependencies. If increment is not supported by backend return 0.
105			*
106			* @param CacheAbstract $cache
107			* @param CacheKey $k
108			* @return integer
109			*/
110			public function dependencyInit(CacheAbstract $cache, CacheKey $k) {
111			try {
112			return $cache->increment(0, $k, 0);
113			}
114			catch (\Cachearium\Exceptions\CacheUnsupportedOperation $e) {
115			return 0;
116			}
117			}
118
119			/**
120			* Get a fresh hash based on dependencies. Does not update the current hash.
121			* @param CacheAbstract $cache
122			* @return string
123			*/
124			public function generateDependenciesHash(CacheAbstract $cache) {
125			if (!count($this->dependencies)) {
126			return '';
127			}
128			$values = $cache->getMulti($this->dependencies, array($this, 'dependencyInit'));
129			return md5(implode($values));
130			}
131
132			public function updateDependenciesHash(CacheAbstract $cache) {
133			$this->dependenciesHash = $this->generateDependenciesHash($cache);
134			return $this;
135			}
136
137			public function updateDependenciesHashIfNull(CacheAbstract $cache) {
138			if (!$this->dependenciesHash) {
139			$this->dependenciesHash = $this->generateDependenciesHash($cache);
140			}
141			return $this;
142			}
143
144			public function getKey() {
145			return $this->key;
146			}
147
148			public function getDependenciesHash() {
149			return $this->dependenciesHash;
150			}
151
152			public function getDependencies() {
153			return $this->dependencies;
154			}
155
156			/**
157			*
158			* @param mixed $data Any kind of data you want to store. usually strings.
159			* @return CacheData
160			*/
161			public function appendData($data) {
162			if ($data) {
163			$this->data[] = array('type' => self::CACHEDATA_TYPE_DATA, 'data' => $data);
164			}
165			return $this;
166			}
167
168			/**
169			* Convenience function. Returns the first data self::CACHEDATA_TYPE_DATA that you
170			* stored. Returns null if there is none.
171			*
172			* @return any\|NULL
173			*/
174			public function getFirstData() {
175			foreach ($this->data as $d) {
176			if ($d['type'] == self::CACHEDATA_TYPE_DATA) {
177			return $d['data'];
178			}
179			}
180			return null;
181			}
182
183			public function appendRecursion(CacheKey $k) {
184			$this->addDependency($k);
185			$this->data[] = array(
186			'type' => self::CACHEDATA_TYPE_RECURSION,
187			'data' => $k
188			);
189			return $this;
190			}
191
192			public function appendRecursionData(CacheData $d) {
193			if (!$d->getKey()) {
194			throw new Exceptions\CacheInvalidDataException();
195			}
196			$this->addDependency($d->getKey());
197			$this->data[] = array(
198			'type' => self::CACHEDATA_TYPE_RECURSION_DATA,
199			'data' => $d->getKey()
200			);
201			return $this;
202			}
203
204			/**
205			* Adds a dependency
206			* @param CacheKey $k
207			* @return CacheData This
208			*/
209			public function addDependency(CacheKey $k) {
210			$this->dependencies[] = $k;
211			$this->clearDependenciesHash();
212			return $this;
213			}
214
215			/**
216			* Adds a dependency
217			* @param array<CacheKey> $k
218			* @return CacheData This
219			*/
220			public function addDependencies(array $deps) {
221			foreach ($deps as $k) {
222			$this->addDependency($k);
223			}
224			return $this;
225			}
226
227			/**
228			* Sets the list of dependencies and updates the dependency hash
229			*
230			* @param array<CacheKey> $deps
231			* @param CacheAbstract $cache
232			* @return CacheData
233			*/
234			public function setDependencies(array $deps, CacheAbstract $cache) {
235			$this->dependencies = [];
236			foreach ($deps as $k) {
237			$this->addDependency($k);
238			}
239			$this->generateDependenciesHash($cache);
240			return $this;
241			}
242
243			/**
244			*
245			* @param integer $lifetime
246			* @return CacheData
247			*/
248			public function setLifetime($lifetime) {
249			$this->lifetime = $lifetime;
250			return $this;
251			}
252
253			/**
254			* Checks if a set of keys clashes with the ones used here.
255			* @param CacheKey $k
256			* @return boolean True if they match and there is a clash
257			*/
258			public function checkClash(CacheKey $k) {
259			return ($this->key == $k);
260			}
261
262			/**
263			* Converts this data to a string that can output. This is not a hash
264			* key or a serialization, but an actual render for humans.
265			*
266			* @throws Exceptions\NotCachedException
267			*/
268			public function stringify(CacheAbstract $c, $recurse = true) {
269			$retval = [];
270			foreach ($this->data as $item) {
271			if ($item['type'] == self::CACHEDATA_TYPE_CALLBACK) {
272			$callback = $item['data'];
273			if (is_callable($callback)) {
274			$retval[] = call_user_func($callback);
275			}
276			else {
277			// throw?
278			}
279			}
280			else if ($item['type'] == self::CACHEDATA_TYPE_RECURSION) {
281			if ($recurse) {
282			$retval[] = $c->get($item['data']);
283			}
284			}
285			else if ($item['type'] == self::CACHEDATA_TYPE_RECURSION_DATA) {
286			if ($recurse) {
287			$data = $c->getData($item['data']);
288			$retval[] = $data->stringify($c);
289			}
290			}
291			else {
292			$retval[] = $item['data'];
293			}
294			}
295
296			return implode('', $retval);
297			}
298
299			/**
300			* Serialize this object to a string so we can easily store.
301			*
302			* @return string
303			*/
304			public function serialize() {
305			return serialize($this);
306			}
307
308			/**
309			* Unserializes data and returns a new CacheData. This is what you
310			* should use to get the object data from the storage.
311			*
312			* @param string $data
313			* @return CacheData
314			*/
315			static public function unserialize($data) {
316			return unserialize($data);
317			}
318			}
319

Corollarium / cachearium

CacheData::updateDependenciesHash() A last analyzed 2017-05-08 14:29 UTC

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CacheData::updateDependenciesHash() A
last analyzed 2017-05-08 14:29 UTC