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616 lines
26 KiB
PHP
616 lines
26 KiB
PHP
<?php
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/**
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* @link https://www.yiiframework.com/
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* @copyright Copyright (c) 2008 Yii Software LLC
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* @license https://www.yiiframework.com/license/
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*/
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namespace yii\caching;
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use Yii;
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use yii\base\Component;
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use yii\helpers\StringHelper;
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/**
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* Cache is the base class for cache classes supporting different cache storage implementations.
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*
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* A data item can be stored in the cache by calling [[set()]] and be retrieved back
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* later (in the same or different request) by [[get()]]. In both operations,
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* a key identifying the data item is required. An expiration time and/or a [[Dependency|dependency]]
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* can also be specified when calling [[set()]]. If the data item expires or the dependency
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* changes at the time of calling [[get()]], the cache will return no data.
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*
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* A typical usage pattern of cache is like the following:
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*
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* ```php
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* $key = 'demo';
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* $data = $cache->get($key);
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* if ($data === false) {
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* // ...generate $data here...
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* $cache->set($key, $data, $duration, $dependency);
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* }
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* ```
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*
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* Because Cache implements the [[\ArrayAccess]] interface, it can be used like an array. For example,
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*
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* ```php
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* $cache['foo'] = 'some data';
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* echo $cache['foo'];
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* ```
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*
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* Derived classes should implement the following methods which do the actual cache storage operations:
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*
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* - [[getValue()]]: retrieve the value with a key (if any) from cache
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* - [[setValue()]]: store the value with a key into cache
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* - [[addValue()]]: store the value only if the cache does not have this key before
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* - [[deleteValue()]]: delete the value with the specified key from cache
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* - [[flushValues()]]: delete all values from cache
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*
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* For more details and usage information on Cache, see the [guide article on caching](guide:caching-overview).
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @since 2.0
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*/
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abstract class Cache extends Component implements CacheInterface
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{
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/**
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* @var string a string prefixed to every cache key so that it is unique globally in the whole cache storage.
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* It is recommended that you set a unique cache key prefix for each application if the same cache
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* storage is being used by different applications.
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*
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* To ensure interoperability, only alphanumeric characters should be used.
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*/
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public $keyPrefix;
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/**
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* @var array|null|false the functions used to serialize and unserialize cached data. Defaults to null, meaning
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* using the default PHP `serialize()` and `unserialize()` functions. If you want to use some more efficient
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* serializer (e.g. [igbinary](https://pecl.php.net/package/igbinary)), you may configure this property with
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* a two-element array. The first element specifies the serialization function, and the second the deserialization
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* function. If this property is set false, data will be directly sent to and retrieved from the underlying
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* cache component without any serialization or deserialization. You should not turn off serialization if
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* you are using [[Dependency|cache dependency]], because it relies on data serialization. Also, some
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* implementations of the cache can not correctly save and retrieve data different from a string type.
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*/
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public $serializer;
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/**
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* @var int default duration in seconds before a cache entry will expire. Default value is 0, meaning infinity.
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* This value is used by [[set()]] if the duration is not explicitly given.
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* @since 2.0.11
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*/
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public $defaultDuration = 0;
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/**
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* @var bool whether [igbinary serialization](https://pecl.php.net/package/igbinary) is available or not.
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*/
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private $_igbinaryAvailable = false;
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/**
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* {@inheritdoc}
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*/
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public function init()
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{
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parent::init();
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$this->_igbinaryAvailable = \extension_loaded('igbinary');
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}
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/**
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* Builds a normalized cache key from a given key.
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*
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* If the given key is a string containing alphanumeric characters only and no more than 32 characters,
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* then the key will be returned back prefixed with [[keyPrefix]]. Otherwise, a normalized key
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* is generated by serializing the given key, applying MD5 hashing, and prefixing with [[keyPrefix]].
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*
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* @param mixed $key the key to be normalized
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* @return string the generated cache key
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*/
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public function buildKey($key)
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{
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if (is_string($key)) {
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$key = ctype_alnum($key) && StringHelper::byteLength($key) <= 32 ? $key : md5($key);
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} else {
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if ($this->_igbinaryAvailable) {
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$serializedKey = igbinary_serialize($key);
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} else {
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$serializedKey = serialize($key);
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}
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$key = md5($serializedKey);
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}
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return $this->keyPrefix . $key;
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}
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/**
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* Retrieves a value from cache with a specified key.
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* @param mixed $key a key identifying the cached value. This can be a simple string or
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* a complex data structure consisting of factors representing the key.
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* @return mixed the value stored in cache, false if the value is not in the cache, expired,
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* or the dependency associated with the cached data has changed.
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*/
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public function get($key)
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{
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$key = $this->buildKey($key);
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$value = $this->getValue($key);
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if ($value === false || $this->serializer === false) {
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return $value;
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} elseif ($this->serializer === null) {
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$value = unserialize((string)$value);
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} else {
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$value = call_user_func($this->serializer[1], $value);
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}
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if (is_array($value) && !($value[1] instanceof Dependency && $value[1]->isChanged($this))) {
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return $value[0];
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}
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return false;
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}
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/**
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* Checks whether a specified key exists in the cache.
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* This can be faster than getting the value from the cache if the data is big.
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* In case a cache does not support this feature natively, this method will try to simulate it
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* but has no performance improvement over getting it.
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* Note that this method does not check whether the dependency associated
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* with the cached data, if there is any, has changed. So a call to [[get]]
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* may return false while exists returns true.
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* @param mixed $key a key identifying the cached value. This can be a simple string or
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* a complex data structure consisting of factors representing the key.
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* @return bool true if a value exists in cache, false if the value is not in the cache or expired.
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*/
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public function exists($key)
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{
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$key = $this->buildKey($key);
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$value = $this->getValue($key);
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return $value !== false;
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}
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/**
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* Retrieves multiple values from cache with the specified keys.
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* Some caches (such as memcache, apc) allow retrieving multiple cached values at the same time,
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* which may improve the performance. In case a cache does not support this feature natively,
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* this method will try to simulate it.
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*
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* @param string[] $keys list of string keys identifying the cached values
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* @return array list of cached values corresponding to the specified keys. The array
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* is returned in terms of (key, value) pairs.
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* If a value is not cached or expired, the corresponding array value will be false.
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* @deprecated This method is an alias for [[multiGet()]] and will be removed in 2.1.0.
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*/
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public function mget($keys)
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{
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return $this->multiGet($keys);
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}
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/**
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* Retrieves multiple values from cache with the specified keys.
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* Some caches (such as memcache, apc) allow retrieving multiple cached values at the same time,
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* which may improve the performance. In case a cache does not support this feature natively,
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* this method will try to simulate it.
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* @param string[] $keys list of string keys identifying the cached values
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* @return array list of cached values corresponding to the specified keys. The array
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* is returned in terms of (key, value) pairs.
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* If a value is not cached or expired, the corresponding array value will be false.
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* @since 2.0.7
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*/
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public function multiGet($keys)
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{
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$keyMap = [];
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foreach ($keys as $key) {
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$keyMap[$key] = $this->buildKey($key);
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}
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$values = $this->getValues(array_values($keyMap));
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$results = [];
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foreach ($keyMap as $key => $newKey) {
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$results[$key] = false;
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if (isset($values[$newKey])) {
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if ($this->serializer === false) {
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$results[$key] = $values[$newKey];
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} else {
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$value = $this->serializer === null ? unserialize($values[$newKey])
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: call_user_func($this->serializer[1], $values[$newKey]);
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if (is_array($value) && !($value[1] instanceof Dependency && $value[1]->isChanged($this))) {
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$results[$key] = $value[0];
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}
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}
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}
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}
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return $results;
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}
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/**
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* Stores a value identified by a key into cache.
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* If the cache already contains such a key, the existing value and
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* expiration time will be replaced with the new ones, respectively.
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*
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* @param mixed $key a key identifying the value to be cached. This can be a simple string or
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* a complex data structure consisting of factors representing the key.
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* @param mixed $value the value to be cached
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* @param int|null $duration default duration in seconds before the cache will expire. If not set,
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* default [[defaultDuration]] value is used.
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* @param Dependency|null $dependency dependency of the cached item. If the dependency changes,
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* the corresponding value in the cache will be invalidated when it is fetched via [[get()]].
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* This parameter is ignored if [[serializer]] is false.
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* @return bool whether the value is successfully stored into cache
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*/
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public function set($key, $value, $duration = null, $dependency = null)
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{
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if ($duration === null) {
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$duration = $this->defaultDuration;
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}
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if ($dependency !== null && $this->serializer !== false) {
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$dependency->evaluateDependency($this);
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}
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if ($this->serializer === null) {
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$value = serialize([$value, $dependency]);
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} elseif ($this->serializer !== false) {
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$value = call_user_func($this->serializer[0], [$value, $dependency]);
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}
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$key = $this->buildKey($key);
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return $this->setValue($key, $value, $duration);
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}
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/**
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* Stores multiple items in cache. Each item contains a value identified by a key.
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* If the cache already contains such a key, the existing value and
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* expiration time will be replaced with the new ones, respectively.
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*
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* @param array $items the items to be cached, as key-value pairs.
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* @param int|null $duration default duration in seconds before the cache will expire. If not set,
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* default [[defaultDuration]] value is used.
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* @param Dependency|null $dependency dependency of the cached items. If the dependency changes,
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* the corresponding values in the cache will be invalidated when it is fetched via [[get()]].
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* This parameter is ignored if [[serializer]] is false.
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* @return array array of failed keys
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* @deprecated This method is an alias for [[multiSet()]] and will be removed in 2.1.0.
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*/
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public function mset($items, $duration = null, $dependency = null)
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{
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return $this->multiSet($items, $duration, $dependency);
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}
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/**
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* Stores multiple items in cache. Each item contains a value identified by a key.
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* If the cache already contains such a key, the existing value and
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* expiration time will be replaced with the new ones, respectively.
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*
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* @param array $items the items to be cached, as key-value pairs.
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* @param int|null $duration default duration in seconds before the cache will expire. If not set,
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* default [[defaultDuration]] value is used.
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* @param Dependency|null $dependency dependency of the cached items. If the dependency changes,
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* the corresponding values in the cache will be invalidated when it is fetched via [[get()]].
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* This parameter is ignored if [[serializer]] is false.
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* @return array array of failed keys
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* @since 2.0.7
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*/
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public function multiSet($items, $duration = null, $dependency = null)
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{
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if ($duration === null) {
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$duration = $this->defaultDuration;
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}
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$data = $this->prepareCacheData($items, $dependency);
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return $this->setValues($data, $duration);
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}
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/**
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* Stores multiple items in cache. Each item contains a value identified by a key.
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* If the cache already contains such a key, the existing value and expiration time will be preserved.
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*
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* @param array $items the items to be cached, as key-value pairs.
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* @param int $duration default number of seconds in which the cached values will expire. 0 means never expire.
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* @param Dependency|null $dependency dependency of the cached items. If the dependency changes,
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* the corresponding values in the cache will be invalidated when it is fetched via [[get()]].
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* This parameter is ignored if [[serializer]] is false.
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* @return array array of failed keys
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* @deprecated This method is an alias for [[multiAdd()]] and will be removed in 2.1.0.
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*/
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public function madd($items, $duration = 0, $dependency = null)
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{
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return $this->multiAdd($items, $duration, $dependency);
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}
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/**
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* Stores multiple items in cache. Each item contains a value identified by a key.
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* If the cache already contains such a key, the existing value and expiration time will be preserved.
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*
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* @param array $items the items to be cached, as key-value pairs.
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* @param int $duration default number of seconds in which the cached values will expire. 0 means never expire.
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* @param Dependency|null $dependency dependency of the cached items. If the dependency changes,
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* the corresponding values in the cache will be invalidated when it is fetched via [[get()]].
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* This parameter is ignored if [[serializer]] is false.
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* @return array array of failed keys
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* @since 2.0.7
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*/
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public function multiAdd($items, $duration = 0, $dependency = null)
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{
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$data = $this->prepareCacheData($items, $dependency);
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return $this->addValues($data, $duration);
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}
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/**
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* Prepares data for caching by serializing values and evaluating dependencies.
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*
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* @param array $items The items to be cached.
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* @param mixed $dependency The dependency to be evaluated.
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*
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* @return array The prepared data for caching.
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*/
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private function prepareCacheData($items, $dependency)
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{
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if ($dependency !== null && $this->serializer !== false) {
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$dependency->evaluateDependency($this);
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}
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$data = [];
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foreach ($items as $key => $value) {
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if ($this->serializer === null) {
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$value = serialize([$value, $dependency]);
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} elseif ($this->serializer !== false) {
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$value = call_user_func($this->serializer[0], [$value, $dependency]);
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}
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$key = $this->buildKey($key);
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$data[$key] = $value;
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}
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return $data;
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}
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/**
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* Stores a value identified by a key into cache if the cache does not contain this key.
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* Nothing will be done if the cache already contains the key.
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* @param mixed $key a key identifying the value to be cached. This can be a simple string or
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* a complex data structure consisting of factors representing the key.
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* @param mixed $value the value to be cached
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* @param int $duration the number of seconds in which the cached value will expire. 0 means never expire.
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* @param Dependency|null $dependency dependency of the cached item. If the dependency changes,
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* the corresponding value in the cache will be invalidated when it is fetched via [[get()]].
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* This parameter is ignored if [[serializer]] is false.
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* @return bool whether the value is successfully stored into cache
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*/
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public function add($key, $value, $duration = 0, $dependency = null)
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{
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if ($dependency !== null && $this->serializer !== false) {
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$dependency->evaluateDependency($this);
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}
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if ($this->serializer === null) {
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$value = serialize([$value, $dependency]);
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} elseif ($this->serializer !== false) {
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$value = call_user_func($this->serializer[0], [$value, $dependency]);
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}
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$key = $this->buildKey($key);
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return $this->addValue($key, $value, $duration);
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}
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/**
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* Deletes a value with the specified key from cache.
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* @param mixed $key a key identifying the value to be deleted from cache. This can be a simple string or
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* a complex data structure consisting of factors representing the key.
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* @return bool if no error happens during deletion
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*/
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public function delete($key)
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{
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$key = $this->buildKey($key);
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return $this->deleteValue($key);
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}
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/**
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* Deletes all values from cache.
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* Be careful of performing this operation if the cache is shared among multiple applications.
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* @return bool whether the flush operation was successful.
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*/
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public function flush()
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{
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return $this->flushValues();
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}
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/**
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* Retrieves a value from cache with a specified key.
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* This method should be implemented by child classes to retrieve the data
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* from specific cache storage.
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* @param string $key a unique key identifying the cached value
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* @return mixed|false the value stored in cache, false if the value is not in the cache or expired. Most often
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* value is a string. If you have disabled [[serializer]], it could be something else.
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*/
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abstract protected function getValue($key);
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/**
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* Stores a value identified by a key in cache.
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* This method should be implemented by child classes to store the data
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* in specific cache storage.
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* @param string $key the key identifying the value to be cached
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* @param mixed $value the value to be cached. Most often it's a string. If you have disabled [[serializer]],
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* it could be something else.
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* @param int $duration the number of seconds in which the cached value will expire. 0 means never expire.
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* @return bool true if the value is successfully stored into cache, false otherwise
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*/
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abstract protected function setValue($key, $value, $duration);
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/**
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* Stores a value identified by a key into cache if the cache does not contain this key.
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* This method should be implemented by child classes to store the data
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* in specific cache storage.
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* @param string $key the key identifying the value to be cached
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* @param mixed $value the value to be cached. Most often it's a string. If you have disabled [[serializer]],
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* it could be something else.
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* @param int $duration the number of seconds in which the cached value will expire. 0 means never expire.
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* @return bool true if the value is successfully stored into cache, false otherwise
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*/
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abstract protected function addValue($key, $value, $duration);
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/**
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* Deletes a value with the specified key from cache
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* This method should be implemented by child classes to delete the data from actual cache storage.
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* @param string $key the key of the value to be deleted
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* @return bool if no error happens during deletion
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*/
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abstract protected function deleteValue($key);
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/**
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* Deletes all values from cache.
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* Child classes may implement this method to realize the flush operation.
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* @return bool whether the flush operation was successful.
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*/
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abstract protected function flushValues();
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/**
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* Retrieves multiple values from cache with the specified keys.
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* The default implementation calls [[getValue()]] multiple times to retrieve
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* the cached values one by one. If the underlying cache storage supports multiget,
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* this method should be overridden to exploit that feature.
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* @param array $keys a list of keys identifying the cached values
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* @return array a list of cached values indexed by the keys
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*/
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protected function getValues($keys)
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{
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$results = [];
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foreach ($keys as $key) {
|
|
$results[$key] = $this->getValue($key);
|
|
}
|
|
|
|
return $results;
|
|
}
|
|
|
|
/**
|
|
* Stores multiple key-value pairs in cache.
|
|
* The default implementation calls [[setValue()]] multiple times store values one by one. If the underlying cache
|
|
* storage supports multi-set, this method should be overridden to exploit that feature.
|
|
* @param array $data array where key corresponds to cache key while value is the value stored
|
|
* @param int $duration the number of seconds in which the cached values will expire. 0 means never expire.
|
|
* @return array array of failed keys
|
|
*/
|
|
protected function setValues($data, $duration)
|
|
{
|
|
$failedKeys = [];
|
|
foreach ($data as $key => $value) {
|
|
if ($this->setValue($key, $value, $duration) === false) {
|
|
$failedKeys[] = $key;
|
|
}
|
|
}
|
|
|
|
return $failedKeys;
|
|
}
|
|
|
|
/**
|
|
* Adds multiple key-value pairs to cache.
|
|
* The default implementation calls [[addValue()]] multiple times add values one by one. If the underlying cache
|
|
* storage supports multi-add, this method should be overridden to exploit that feature.
|
|
* @param array $data array where key corresponds to cache key while value is the value stored.
|
|
* @param int $duration the number of seconds in which the cached values will expire. 0 means never expire.
|
|
* @return array array of failed keys
|
|
*/
|
|
protected function addValues($data, $duration)
|
|
{
|
|
$failedKeys = [];
|
|
foreach ($data as $key => $value) {
|
|
if ($this->addValue($key, $value, $duration) === false) {
|
|
$failedKeys[] = $key;
|
|
}
|
|
}
|
|
|
|
return $failedKeys;
|
|
}
|
|
|
|
/**
|
|
* Returns whether there is a cache entry with a specified key.
|
|
* This method is required by the interface [[\ArrayAccess]].
|
|
* @param string $key a key identifying the cached value
|
|
* @return bool
|
|
*/
|
|
#[\ReturnTypeWillChange]
|
|
public function offsetExists($key)
|
|
{
|
|
return $this->get($key) !== false;
|
|
}
|
|
|
|
/**
|
|
* Retrieves the value from cache with a specified key.
|
|
* This method is required by the interface [[\ArrayAccess]].
|
|
* @param string $key a key identifying the cached value
|
|
* @return mixed the value stored in cache, false if the value is not in the cache or expired.
|
|
*/
|
|
#[\ReturnTypeWillChange]
|
|
public function offsetGet($key)
|
|
{
|
|
return $this->get($key);
|
|
}
|
|
|
|
/**
|
|
* Stores the value identified by a key into cache.
|
|
* If the cache already contains such a key, the existing value will be
|
|
* replaced with the new ones. To add expiration and dependencies, use the [[set()]] method.
|
|
* This method is required by the interface [[\ArrayAccess]].
|
|
* @param string $key the key identifying the value to be cached
|
|
* @param mixed $value the value to be cached
|
|
*/
|
|
#[\ReturnTypeWillChange]
|
|
public function offsetSet($key, $value)
|
|
{
|
|
$this->set($key, $value);
|
|
}
|
|
|
|
/**
|
|
* Deletes the value with the specified key from cache
|
|
* This method is required by the interface [[\ArrayAccess]].
|
|
* @param string $key the key of the value to be deleted
|
|
*/
|
|
#[\ReturnTypeWillChange]
|
|
public function offsetUnset($key)
|
|
{
|
|
$this->delete($key);
|
|
}
|
|
|
|
/**
|
|
* Method combines both [[set()]] and [[get()]] methods to retrieve value identified by a $key,
|
|
* or to store the result of $callable execution if there is no cache available for the $key.
|
|
*
|
|
* Usage example:
|
|
*
|
|
* ```php
|
|
* public function getTopProducts($count = 10) {
|
|
* $cache = $this->cache; // Could be Yii::$app->cache
|
|
* return $cache->getOrSet(['top-n-products', 'n' => $count], function () use ($count) {
|
|
* return Products::find()->mostPopular()->limit($count)->all();
|
|
* }, 1000);
|
|
* }
|
|
* ```
|
|
*
|
|
* @param mixed $key a key identifying the value to be cached. This can be a simple string or
|
|
* a complex data structure consisting of factors representing the key.
|
|
* @param callable|\Closure $callable the callable or closure that will be used to generate a value to be cached.
|
|
* If you use $callable that can return `false`, then keep in mind that [[getOrSet()]] may work inefficiently
|
|
* because the [[yii\caching\Cache::get()]] method uses `false` return value to indicate the data item is not found
|
|
* in the cache. Thus, caching of `false` value will lead to unnecessary internal calls.
|
|
* @param int|null $duration default duration in seconds before the cache will expire. If not set,
|
|
* [[defaultDuration]] value will be used.
|
|
* @param Dependency|null $dependency dependency of the cached item. If the dependency changes,
|
|
* the corresponding value in the cache will be invalidated when it is fetched via [[get()]].
|
|
* This parameter is ignored if [[serializer]] is `false`.
|
|
* @return mixed result of $callable execution
|
|
* @since 2.0.11
|
|
*/
|
|
public function getOrSet($key, $callable, $duration = null, $dependency = null)
|
|
{
|
|
if (($value = $this->get($key)) !== false) {
|
|
return $value;
|
|
}
|
|
|
|
$value = call_user_func($callable, $this);
|
|
if (!$this->set($key, $value, $duration, $dependency)) {
|
|
Yii::warning('Failed to set cache value for key ' . json_encode($key), __METHOD__);
|
|
}
|
|
|
|
return $value;
|
|
}
|
|
}
|