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469 lines
19 KiB
PHP
469 lines
19 KiB
PHP
<?php
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/**
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* @link http://www.yiiframework.com/
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* @copyright Copyright (c) 2008 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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namespace yii\caching;
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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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* @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 \ArrayAccess
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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|boolean 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](http://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.
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*/
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public $serializer;
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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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$key = md5(json_encode($key));
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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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$value = unserialize($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 && $value[1]->getHasChanged($this))) {
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return $value[0];
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} else {
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return false;
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}
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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 $key a key identifying the cached value. This can be a simple string or
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* a complex data structure consisting of factors representing the key.
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* @return boolean true if a value exists in cache, false if the value is not in the cache or expired.
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*/
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public function exists($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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* @param string[] $keys list of string keys identifying the cached values
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* @return array list of cached values corresponding to the specified keys. The array
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* is returned in terms of (key, value) pairs.
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* If a value is not cached or expired, the corresponding array value will be false.
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*/
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public function mget($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 && $value[1]->getHasChanged($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 integer $duration the number of seconds in which the cached value will expire. 0 means never expire.
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* @param Dependency $dependency dependency of the cached item. If the dependency changes,
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* the corresponding value in the cache will be invalidated when it is fetched via [[get()]].
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* This parameter is ignored if [[serializer]] is false.
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* @return boolean whether the value is successfully stored into cache
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*/
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public function set($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 $this->setValue($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 integer $duration default number of seconds in which the cached values will expire. 0 means never expire.
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* @param Dependency $dependency dependency of the cached items. If the dependency changes,
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* the corresponding values in the cache will be invalidated when it is fetched via [[get()]].
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* This parameter is ignored if [[serializer]] is false.
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* @return boolean whether the items are successfully stored into cache
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*/
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public function mset($items, $duration = 0, $dependency = null)
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{
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if ($dependency !== null && $this->serializer !== false) {
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$dependency->evaluateDependency($this);
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}
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$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 $this->setValues($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 integer $duration default number of seconds in which the cached values will expire. 0 means never expire.
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* @param Dependency $dependency dependency of the cached items. If the dependency changes,
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* the corresponding values in the cache will be invalidated when it is fetched via [[get()]].
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* This parameter is ignored if [[serializer]] is false.
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* @return boolean whether the items are successfully stored into cache
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*/
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public function madd($items, $duration = 0, $dependency = null)
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{
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if ($dependency !== null && $this->serializer !== false) {
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$dependency->evaluateDependency($this);
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}
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$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 $this->addValues($data, $duration);
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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 integer $duration the number of seconds in which the cached value will expire. 0 means never expire.
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* @param Dependency $dependency dependency of the cached item. If the dependency changes,
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* the corresponding value in the cache will be invalidated when it is fetched via [[get()]].
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* This parameter is ignored if [[serializer]] is false.
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* @return boolean whether the value is successfully stored into cache
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*/
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public function add($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 $key a key identifying the value to be deleted from cache. This can be a simple string or
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* a complex data structure consisting of factors representing the key.
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* @return boolean if no error happens during deletion
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*/
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public function delete($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 boolean 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 $key a unique key identifying the cached value
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* @return string|boolean the value stored in cache, false if the value is not in the cache or expired.
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*/
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abstract protected function getValue($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 string $value the value to be cached
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* @param integer $duration the number of seconds in which the cached value will expire. 0 means never expire.
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* @return boolean true if the value is successfully stored into cache, false otherwise
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*/
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abstract protected function setValue($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 string $value the value to be cached
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* @param integer $duration the number of seconds in which the cached value will expire. 0 means never expire.
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* @return boolean true if the value is successfully stored into cache, false otherwise
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*/
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abstract protected function addValue($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 $key the key of the value to be deleted
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* @return boolean if no error happens during deletion
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*/
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abstract protected function deleteValue($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 boolean 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 $key) {
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$results[$key] = $this->getValue($key);
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}
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return $results;
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}
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/**
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* Stores multiple key-value pairs in cache.
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* The default implementation calls [[setValue()]] multiple times store values one by one. If the underlying cache
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* storage supports multi-set, this method should be overridden to exploit that feature.
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* @param array $data array where key corresponds to cache key while value is the value stored
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* @param integer $duration the number of seconds in which the cached values will expire. 0 means never expire.
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* @return array array of failed keys
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*/
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protected function setValues($data, $duration)
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{
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$failedKeys = [];
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foreach ($data as $key => $value) {
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if ($this->setValue($key, $value, $duration) === false) {
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$failedKeys[] = $key;
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}
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}
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return $failedKeys;
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}
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/**
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* Adds multiple key-value pairs to cache.
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* The default implementation calls [[addValue()]] multiple times add values one by one. If the underlying cache
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* storage supports multi-add, this method should be overridden to exploit that feature.
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* @param array $data array where key corresponds to cache key while value is the value stored
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* @param integer $duration the number of seconds in which the cached values will expire. 0 means never expire.
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* @return array array of failed keys
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*/
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protected function addValues($data, $duration)
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{
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$failedKeys = [];
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foreach ($data as $key => $value) {
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if ($this->addValue($key, $value, $duration) === false) {
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$failedKeys[] = $key;
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}
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}
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return $failedKeys;
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}
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/**
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* Returns whether there is a cache entry with a specified key.
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* This method is required by the interface ArrayAccess.
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* @param string $key a key identifying the cached value
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* @return boolean
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*/
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public function offsetExists($key)
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{
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return $this->get($key) !== false;
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}
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/**
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* Retrieves the value from cache with a specified key.
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* This method is required by the interface ArrayAccess.
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* @param string $key a key identifying the cached value
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* @return mixed the value stored in cache, false if the value is not in the cache or expired.
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*/
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public function offsetGet($key)
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{
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return $this->get($key);
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}
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/**
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* Stores the value identified by a key into cache.
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* If the cache already contains such a key, the existing value will be
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* replaced with the new ones. To add expiration and dependencies, use the [[set()]] method.
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* This method is required by the interface ArrayAccess.
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* @param string $key the key identifying the value to be cached
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* @param mixed $value the value to be cached
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*/
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public function offsetSet($key, $value)
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{
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$this->set($key, $value);
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}
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/**
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* Deletes the value with the specified key from cache
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* This method is required by the interface ArrayAccess.
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* @param string $key the key of the value to be deleted
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*/
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public function offsetUnset($key)
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{
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$this->delete($key);
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}
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}
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