You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
476 lines
18 KiB
476 lines
18 KiB
<?php |
|
/** |
|
* @link http://www.yiiframework.com/ |
|
* @copyright Copyright (c) 2008 Yii Software LLC |
|
* @license http://www.yiiframework.com/license/ |
|
*/ |
|
|
|
namespace yii\caching; |
|
|
|
use Yii; |
|
use yii\base\Component; |
|
use yii\base\InvalidConfigException; |
|
use yii\helpers\StringHelper; |
|
|
|
/** |
|
* Cache is the base class for cache classes supporting different cache storage implementation. |
|
* |
|
* A data item can be stored in cache by calling [[set()]] and be retrieved back |
|
* later (in the same or different request) by [[get()]]. In both operations, |
|
* a key identifying the data item is required. An expiration time and/or a [[Dependency|dependency]] |
|
* can also be specified when calling [[set()]]. If the data item expires or the dependency |
|
* changes at the time of calling [[get()]], the cache will return no data. |
|
* |
|
* A typical usage pattern of cache is like the following: |
|
* |
|
* ~~~ |
|
* $key = 'demo'; |
|
* $data = $cache->get($key); |
|
* if ($data === false) { |
|
* // ...generate $data here... |
|
* $cache->set($key, $data, $expire, $dependency); |
|
* } |
|
* ~~~ |
|
* |
|
* Because Cache implements the ArrayAccess interface, it can be used like an array. For example, |
|
* |
|
* ~~~ |
|
* $cache['foo'] = 'some data'; |
|
* echo $cache['foo']; |
|
* ~~~ |
|
* |
|
* Derived classes should implement the following methods: |
|
* |
|
* - [[getValue()]]: retrieve the value with a key (if any) from cache |
|
* - [[setValue()]]: store the value with a key into cache |
|
* - [[addValue()]]: store the value only if the cache does not have this key before |
|
* - [[deleteValue()]]: delete the value with the specified key from cache |
|
* - [[flushValues()]]: delete all values from cache |
|
* |
|
* @author Qiang Xue <qiang.xue@gmail.com> |
|
* @since 2.0 |
|
*/ |
|
abstract class Cache extends Component implements \ArrayAccess |
|
{ |
|
/** |
|
* @var string a string prefixed to every cache key so that it is unique. If not set, |
|
* it will use a prefix generated from [[Application::id]]. You may set this property to be an empty string |
|
* if you don't want to use key prefix. It is recommended that you explicitly set this property to some |
|
* static value if the cached data needs to be shared among multiple applications. |
|
* |
|
* To ensure interoperability, only alphanumeric characters should be used. |
|
*/ |
|
public $keyPrefix; |
|
/** |
|
* @var array|boolean the functions used to serialize and unserialize cached data. Defaults to null, meaning |
|
* using the default PHP `serialize()` and `unserialize()` functions. If you want to use some more efficient |
|
* serializer (e.g. [igbinary](http://pecl.php.net/package/igbinary)), you may configure this property with |
|
* a two-element array. The first element specifies the serialization function, and the second the deserialization |
|
* function. If this property is set false, data will be directly sent to and retrieved from the underlying |
|
* cache component without any serialization or deserialization. You should not turn off serialization if |
|
* you are using [[Dependency|cache dependency]], because it relies on data serialization. |
|
*/ |
|
public $serializer; |
|
|
|
|
|
/** |
|
* Initializes the application component. |
|
* This method overrides the parent implementation by setting default cache key prefix. |
|
*/ |
|
public function init() |
|
{ |
|
parent::init(); |
|
if ($this->keyPrefix === null) { |
|
$this->keyPrefix = substr(md5(Yii::$app->id), 0, 5); |
|
} elseif (!ctype_alnum($this->keyPrefix)) { |
|
throw new InvalidConfigException(get_class($this) . '::keyPrefix should only contain alphanumeric characters.'); |
|
} |
|
} |
|
|
|
/** |
|
* Builds a normalized cache key from a given key. |
|
* |
|
* If the given key is a string containing alphanumeric characters only and no more than 32 characters, |
|
* then the key will be returned back prefixed with [[keyPrefix]]. Otherwise, a normalized key |
|
* is generated by serializing the given key, applying MD5 hashing, and prefixing with [[keyPrefix]]. |
|
* |
|
* @param mixed $key the key to be normalized |
|
* @return string the generated cache key |
|
*/ |
|
protected function buildKey($key) |
|
{ |
|
if (is_string($key)) { |
|
$key = ctype_alnum($key) && StringHelper::byteLen($key) <= 32 ? $key : md5($key); |
|
} else { |
|
$key = md5(json_encode($key)); |
|
} |
|
return $this->keyPrefix . $key; |
|
} |
|
|
|
/** |
|
* Retrieves a value from cache with a specified key. |
|
* @param mixed $key a key identifying the cached value. This can be a simple string or |
|
* a complex data structure consisting of factors representing the key. |
|
* @return mixed the value stored in cache, false if the value is not in the cache, expired, |
|
* or the dependency associated with the cached data has changed. |
|
*/ |
|
public function get($key) |
|
{ |
|
$key = $this->buildKey($key); |
|
$value = $this->getValue($key); |
|
if ($value === false || $this->serializer === false) { |
|
return $value; |
|
} elseif ($this->serializer === null) { |
|
$value = unserialize($value); |
|
} else { |
|
$value = call_user_func($this->serializer[1], $value); |
|
} |
|
if (is_array($value) && !($value[1] instanceof Dependency && $value[1]->getHasChanged($this))) { |
|
return $value[0]; |
|
} else { |
|
return false; |
|
} |
|
} |
|
|
|
/** |
|
* Checks whether a specified key exists in the cache. |
|
* This can be faster than getting the value from the cache if the data is big. |
|
* In case a cache does not support this feature natively, this method will try to simulate it |
|
* but has no performance improvement over getting it. |
|
* Note that this method does not check whether the dependency associated |
|
* with the cached data, if there is any, has changed. So a call to [[get]] |
|
* may return false while exists returns true. |
|
* @param mixed $key a key identifying the cached value. This can be a simple string or |
|
* a complex data structure consisting of factors representing the key. |
|
* @return boolean true if a value exists in cache, false if the value is not in the cache or expired. |
|
*/ |
|
public function exists($key) |
|
{ |
|
$key = $this->buildKey($key); |
|
$value = $this->getValue($key); |
|
return $value !== false; |
|
} |
|
|
|
/** |
|
* Retrieves multiple values from cache with the specified keys. |
|
* Some caches (such as memcache, apc) allow retrieving multiple cached values at the same time, |
|
* which may improve the performance. In case a cache does not support this feature natively, |
|
* this method will try to simulate it. |
|
* @param array $keys list of keys identifying the cached values |
|
* @return array list of cached values corresponding to the specified keys. The array |
|
* is returned in terms of (key, value) pairs. |
|
* If a value is not cached or expired, the corresponding array value will be false. |
|
*/ |
|
public function mget($keys) |
|
{ |
|
$keyMap = []; |
|
foreach ($keys as $key) { |
|
$keyMap[$key] = $this->buildKey($key); |
|
} |
|
$values = $this->getValues(array_values($keyMap)); |
|
$results = []; |
|
foreach ($keyMap as $key => $newKey) { |
|
$results[$key] = false; |
|
if (isset($values[$newKey])) { |
|
if ($this->serializer === false) { |
|
$results[$key] = $values[$newKey]; |
|
} else { |
|
$value = $this->serializer === null ? unserialize($values[$newKey]) |
|
: call_user_func($this->serializer[1], $values[$newKey]); |
|
|
|
if (is_array($value) && !($value[1] instanceof Dependency && $value[1]->getHasChanged($this))) { |
|
$results[$key] = $value[0]; |
|
} |
|
} |
|
} |
|
} |
|
return $results; |
|
} |
|
|
|
/** |
|
* Stores a value identified by a key into cache. |
|
* If the cache already contains such a key, the existing value and |
|
* expiration time will be replaced with the new ones, respectively. |
|
* |
|
* @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 mixed $value the value to be cached |
|
* @param integer $expire the number of seconds in which the cached value will expire. 0 means never expire. |
|
* @param Dependency $dependency dependency of the cached item. If the dependency changes, |
|
* the corresponding value in the cache will be invalidated when it is fetched via [[get()]]. |
|
* This parameter is ignored if [[serializer]] is false. |
|
* @return boolean whether the value is successfully stored into cache |
|
*/ |
|
public function set($key, $value, $expire = 0, $dependency = null) |
|
{ |
|
if ($dependency !== null && $this->serializer !== false) { |
|
$dependency->evaluateDependency($this); |
|
} |
|
if ($this->serializer === null) { |
|
$value = serialize([$value, $dependency]); |
|
} elseif ($this->serializer !== false) { |
|
$value = call_user_func($this->serializer[0], [$value, $dependency]); |
|
} |
|
$key = $this->buildKey($key); |
|
return $this->setValue($key, $value, $expire); |
|
} |
|
|
|
/** |
|
* Stores multiple items in cache. Each item contains a value identified by a key. |
|
* If the cache already contains such a key, the existing value and |
|
* expiration time will be replaced with the new ones, respectively. |
|
* |
|
* @param array $items the items to be cached, as key-value pairs. |
|
* @param integer $expire default number of seconds in which the cached values will expire. 0 means never expire. |
|
* @param Dependency $dependency dependency of the cached items. If the dependency changes, |
|
* the corresponding values in the cache will be invalidated when it is fetched via [[get()]]. |
|
* This parameter is ignored if [[serializer]] is false. |
|
* @return boolean whether the items are successfully stored into cache |
|
*/ |
|
public function mset($items, $expire = 0, $dependency = null) |
|
{ |
|
if ($dependency !== null && $this->serializer !== false) { |
|
$dependency->evaluateDependency($this); |
|
} |
|
|
|
$data = []; |
|
foreach ($items as $key => $value) { |
|
$itemKey = $this->buildKey($key); |
|
if ($this->serializer === null) { |
|
$itemValue = serialize([$value, $dependency]); |
|
} elseif ($this->serializer !== false) { |
|
$itemValue = call_user_func($this->serializer[0], [$value, $dependency]); |
|
} |
|
|
|
$data[$itemKey] = $itemValue; |
|
} |
|
return $this->setValues($data, $expire); |
|
} |
|
|
|
/** |
|
* Stores multiple items in cache. Each item contains a value identified by a key. |
|
* If the cache already contains such a key, the existing value and expiration time will be preserved. |
|
* |
|
* @param array $items the items to be cached, as key-value pairs. |
|
* @param integer $expire default number of seconds in which the cached values will expire. 0 means never expire. |
|
* @param Dependency $dependency dependency of the cached items. If the dependency changes, |
|
* the corresponding values in the cache will be invalidated when it is fetched via [[get()]]. |
|
* This parameter is ignored if [[serializer]] is false. |
|
* @return boolean whether the items are successfully stored into cache |
|
*/ |
|
public function madd($items, $expire = 0, $dependency = null) |
|
{ |
|
if ($dependency !== null && $this->serializer !== false) { |
|
$dependency->evaluateDependency($this); |
|
} |
|
|
|
$data = []; |
|
foreach ($items as $key => $value) { |
|
$itemKey = $this->buildKey($key); |
|
if ($this->serializer === null) { |
|
$itemValue = serialize([$value, $dependency]); |
|
} elseif ($this->serializer !== false) { |
|
$itemValue = call_user_func($this->serializer[0], [$value, $dependency]); |
|
} |
|
|
|
$data[$itemKey] = $itemValue; |
|
} |
|
return $this->addValues($data, $expire); |
|
} |
|
|
|
/** |
|
* Stores a value identified by a key into cache if the cache does not contain this key. |
|
* Nothing will be done if the cache already contains the key. |
|
* @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 mixed $value the value to be cached |
|
* @param integer $expire the number of seconds in which the cached value will expire. 0 means never expire. |
|
* @param Dependency $dependency dependency of the cached item. If the dependency changes, |
|
* the corresponding value in the cache will be invalidated when it is fetched via [[get()]]. |
|
* This parameter is ignored if [[serializer]] is false. |
|
* @return boolean whether the value is successfully stored into cache |
|
*/ |
|
public function add($key, $value, $expire = 0, $dependency = null) |
|
{ |
|
if ($dependency !== null && $this->serializer !== false) { |
|
$dependency->evaluateDependency($this); |
|
} |
|
if ($this->serializer === null) { |
|
$value = serialize([$value, $dependency]); |
|
} elseif ($this->serializer !== false) { |
|
$value = call_user_func($this->serializer[0], [$value, $dependency]); |
|
} |
|
$key = $this->buildKey($key); |
|
return $this->addValue($key, $value, $expire); |
|
} |
|
|
|
/** |
|
* Deletes a value with the specified key from cache |
|
* @param mixed $key a key identifying the value to be deleted from cache. This can be a simple string or |
|
* a complex data structure consisting of factors representing the key. |
|
* @return boolean if no error happens during deletion |
|
*/ |
|
public function delete($key) |
|
{ |
|
$key = $this->buildKey($key); |
|
return $this->deleteValue($key); |
|
} |
|
|
|
/** |
|
* Deletes all values from cache. |
|
* Be careful of performing this operation if the cache is shared among multiple applications. |
|
* @return boolean whether the flush operation was successful. |
|
*/ |
|
public function flush() |
|
{ |
|
return $this->flushValues(); |
|
} |
|
|
|
/** |
|
* Retrieves a value from cache with a specified key. |
|
* This method should be implemented by child classes to retrieve the data |
|
* from specific cache storage. |
|
* @param string $key a unique key identifying the cached value |
|
* @return string|boolean the value stored in cache, false if the value is not in the cache or expired. |
|
*/ |
|
abstract protected function getValue($key); |
|
|
|
/** |
|
* Stores a value identified by a key in cache. |
|
* This method should be implemented by child classes to store the data |
|
* in specific cache storage. |
|
* @param string $key the key identifying the value to be cached |
|
* @param string $value the value to be cached |
|
* @param integer $expire the number of seconds in which the cached value will expire. 0 means never expire. |
|
* @return boolean true if the value is successfully stored into cache, false otherwise |
|
*/ |
|
abstract protected function setValue($key, $value, $expire); |
|
|
|
/** |
|
* Stores a value identified by a key into cache if the cache does not contain this key. |
|
* This method should be implemented by child classes to store the data |
|
* in specific cache storage. |
|
* @param string $key the key identifying the value to be cached |
|
* @param string $value the value to be cached |
|
* @param integer $expire the number of seconds in which the cached value will expire. 0 means never expire. |
|
* @return boolean true if the value is successfully stored into cache, false otherwise |
|
*/ |
|
abstract protected function addValue($key, $value, $expire); |
|
|
|
/** |
|
* Deletes a value with the specified key from cache |
|
* This method should be implemented by child classes to delete the data from actual cache storage. |
|
* @param string $key the key of the value to be deleted |
|
* @return boolean if no error happens during deletion |
|
*/ |
|
abstract protected function deleteValue($key); |
|
|
|
/** |
|
* Deletes all values from cache. |
|
* Child classes may implement this method to realize the flush operation. |
|
* @return boolean whether the flush operation was successful. |
|
*/ |
|
abstract protected function flushValues(); |
|
|
|
/** |
|
* Retrieves multiple values from cache with the specified keys. |
|
* The default implementation calls [[getValue()]] multiple times to retrieve |
|
* the cached values one by one. If the underlying cache storage supports multiget, |
|
* this method should be overridden to exploit that feature. |
|
* @param array $keys a list of keys identifying the cached values |
|
* @return array a list of cached values indexed by the keys |
|
*/ |
|
protected function getValues($keys) |
|
{ |
|
$results = []; |
|
foreach ($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 multiset, 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 integer $expire the number of seconds in which the cached values will expire. 0 means never expire. |
|
* @return array array of failed keys |
|
*/ |
|
protected function setValues($data, $expire) |
|
{ |
|
$failedKeys = []; |
|
foreach ($data as $key => $value) |
|
{ |
|
if ($this->setValue($key, $value, $expire) === 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 multiadd, 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 integer $expire the number of seconds in which the cached values will expire. 0 means never expire. |
|
* @return array array of failed keys |
|
*/ |
|
protected function addValues($data, $expire) |
|
{ |
|
$failedKeys = []; |
|
foreach ($data as $key => $value) |
|
{ |
|
if ($this->addValue($key, $value, $expire) === 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 $key a key identifying the cached value |
|
* @return boolean |
|
*/ |
|
public function offsetExists($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 $key a key identifying the cached value |
|
* @return mixed the value stored in cache, false if the value is not in the cache or expired. |
|
*/ |
|
public function offsetGet($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 $value the value to be cached |
|
*/ |
|
public function offsetSet($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 $key the key of the value to be deleted |
|
*/ |
|
public function offsetUnset($key) |
|
{ |
|
$this->delete($key); |
|
} |
|
}
|
|
|