CZendDataCache
| 包 | system.caching |
|---|---|
| 继承 | class CZendDataCache » CCache » CApplicationComponent » CComponent |
| 实现 | ArrayAccess, ICache, IApplicationComponent |
| 源码 | framework/caching/CZendDataCache.php |
CZendDataCache implements a cache application module based on the Zend Data Cache
delivered with ZendServer.
To use this application component, the Zend Data Cache PHP extension must be loaded.
See CCache manual for common cache operations that are supported by CZendDataCache.
To use this application component, the Zend Data Cache PHP extension must be loaded.
See CCache manual for common cache operations that are supported by CZendDataCache.
公共属性
| 属性 | 类型 | 描述 | 被定义在 |
|---|---|---|---|
| behaviors | array | the behaviors that should be attached to this component. | CApplicationComponent |
| hashKey | boolean | whether to md5-hash the cache key for normalization purposes. | CCache |
| isInitialized | boolean | Checks if this application component has been initialized. | CApplicationComponent |
| keyPrefix | string | a string prefixed to every cache key so that it is unique. | CCache |
| serializer | array|boolean | the functions used to serialize and unserialize cached data. | CCache |
公共方法
| 方法 | 描述 | 被定义在 |
|---|---|---|
| __call() | Calls the named method which is not a class method. | CComponent |
| __get() | Returns a property value, an event handler list or a behavior based on its name. | CComponent |
| __isset() | Checks if a property value is null. | CComponent |
| __set() | Sets value of a component property. | CComponent |
| __unset() | Sets a component property to be null. | CComponent |
| add() | Stores a value identified by a key into cache if the cache does not contain this key. | CCache |
| asa() | Returns the named behavior object. | CComponent |
| attachBehavior() | Attaches a behavior to this component. | CComponent |
| attachBehaviors() | Attaches a list of behaviors to the component. | CComponent |
| attachEventHandler() | Attaches an event handler to an event. | CComponent |
| canGetProperty() | Determines whether a property can be read. | CComponent |
| canSetProperty() | Determines whether a property can be set. | CComponent |
| delete() | Deletes a value with the specified key from cache | CCache |
| detachBehavior() | Detaches a behavior from the component. | CComponent |
| detachBehaviors() | Detaches all behaviors from the component. | CComponent |
| detachEventHandler() | Detaches an existing event handler. | CComponent |
| disableBehavior() | Disables an attached behavior. | CComponent |
| disableBehaviors() | Disables all behaviors attached to this component. | CComponent |
| enableBehavior() | Enables an attached behavior. | CComponent |
| enableBehaviors() | Enables all behaviors attached to this component. | CComponent |
| evaluateExpression() | Evaluates a PHP expression or callback under the context of this component. | CComponent |
| flush() | Deletes all values from cache. | CCache |
| get() | Retrieves a value from cache with a specified key. | CCache |
| getEventHandlers() | Returns the list of attached event handlers for an event. | CComponent |
| getIsInitialized() | Checks if this application component has been initialized. | CApplicationComponent |
| hasEvent() | Determines whether an event is defined. | CComponent |
| hasEventHandler() | Checks whether the named event has attached handlers. | CComponent |
| hasProperty() | Determines whether a property is defined. | CComponent |
| init() | Initializes this application component. | CZendDataCache |
| mget() | Retrieves multiple values from cache with the specified keys. | CCache |
| offsetExists() | Returns whether there is a cache entry with a specified key. | CCache |
| offsetGet() | Retrieves the value from cache with a specified key. | CCache |
| offsetSet() | Stores the value identified by a key into cache. | CCache |
| offsetUnset() | Deletes the value with the specified key from cache | CCache |
| raiseEvent() | Raises an event. | CComponent |
| set() | Stores a value identified by a key into cache. | CCache |
受保护的方法
| 方法 | 描述 | 被定义在 |
|---|---|---|
| addValue() | Stores a value identified by a key into cache if the cache does not contain this key. | CZendDataCache |
| deleteValue() | Deletes a value with the specified key from cache | CZendDataCache |
| flushValues() | Deletes all values from cache. | CZendDataCache |
| generateUniqueKey() | CCache | |
| getValue() | Retrieves a value from cache with a specified key. | CZendDataCache |
| getValues() | Retrieves multiple values from cache with the specified keys. | CCache |
| setValue() | Stores a value identified by a key in cache. | CZendDataCache |
方法详情
addValue()
方法
|
protected boolean addValue(string $key, string $value, integer $expire)
| ||
| $key | string | the key identifying the value to be cached |
| $value | string | the value to be cached |
| $expire | integer | the number of seconds in which the cached value will expire. 0 means never expire. |
| {return} | boolean | true if the value is successfully stored into cache, false otherwise |
源码： framework/caching/CZendDataCache.php#72 (显示)
protected function addValue($key,$value,$expire)
{
return (NULL === zend_shm_cache_fetch($key)) ? $this->setValue($key,$value,$expire) : false;
}
Stores a value identified by a key into cache if the cache does not contain this key. This is the implementation of the method declared in the parent class.
deleteValue()
方法
|
protected boolean deleteValue(string $key)
| ||
| $key | string | the key of the value to be deleted |
| {return} | boolean | if no error happens during deletion |
源码： framework/caching/CZendDataCache.php#83 (显示)
protected function deleteValue($key)
{
return zend_shm_cache_delete($key);
}
Deletes a value with the specified key from cache This is the implementation of the method declared in the parent class.
flushValues()
方法
（自版本 v1.1.5 可用）
|
protected boolean flushValues()
| ||
| {return} | boolean | whether the flush operation was successful. |
源码： framework/caching/CZendDataCache.php#94 (显示)
protected function flushValues()
{
return zend_shm_cache_clear();
}
Deletes all values from cache. This is the implementation of the method declared in the parent class.
getValue()
方法
|
protected string|boolean getValue(string $key)
| ||
| $key | string | a unique key identifying the cached value |
| {return} | string|boolean | the value stored in cache, false if the value is not in the cache or expired. |
源码： framework/caching/CZendDataCache.php#43 (显示)
protected function getValue($key)
{
$result = zend_shm_cache_fetch($key);
return $result !== NULL ? $result : false;
}
Retrieves a value from cache with a specified key. This is the implementation of the method declared in the parent class.
init()
方法
|
public void init()
|
源码： framework/caching/CZendDataCache.php#30 (显示)
public function init()
{
parent::init();
if(!function_exists('zend_shm_cache_store'))
throw new CException(Yii::t('yii','CZendDataCache requires PHP Zend Data Cache extension to be loaded.'));
}
Initializes this application component. This method is required by the IApplicationComponent interface. It checks the availability of Zend Data Cache.
setValue()
方法
|
protected boolean setValue(string $key, string $value, integer $expire)
| ||
| $key | string | the key identifying the value to be cached |
| $value | string | the value to be cached |
| $expire | integer | the number of seconds in which the cached value will expire. 0 means never expire. |
| {return} | boolean | true if the value is successfully stored into cache, false otherwise |
源码： framework/caching/CZendDataCache.php#58 (显示)
protected function setValue($key,$value,$expire)
{
return zend_shm_cache_store($key,$value,$expire);
}
Stores a value identified by a key in cache. This is the implementation of the method declared in the parent class.