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CZendDataCache

Package system.caching
Inheritance class CZendDataCache » CCache » CApplicationComponent » CComponent
Implements ArrayAccess, ICache, IApplicationComponent
Since 1.0.4
Version $Id$
Source Code 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.

Public Properties

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PropertyTypeDescriptionDefined By
behaviors array the behaviors that should be attached to this component. CApplicationComponent
isInitialized boolean whether this application component has been initialized (i.e., init() is invoked. CApplicationComponent
keyPrefix string a string prefixed to every cache key so that it is unique. CCache

Public Methods

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MethodDescriptionDefined By
__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
flush() Deletes all values from cache. CZendDataCache
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 whether this application component has been initialized (i.e., init() is invoked.) 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

Protected Methods

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MethodDescriptionDefined By
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
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

Method Details

addValue() method
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
$expire integer the number of seconds in which the cached value will expire. 0 means never expire.
{return} boolean true if the value is successfully stored into cache, false otherwise
Source Code: framework/caching/CZendDataCache.php#74 (show)
protected function addValue($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() method
protected boolean deleteValue(string $key)
$key string the key of the value to be deleted
{return} boolean if no error happens during deletion
Source Code: framework/caching/CZendDataCache.php#85 (show)
protected function deleteValue($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.

flush() method
public void flush()
Source Code: framework/caching/CZendDataCache.php#94 (show)
public function flush()
{
    zend_shm_cache_clear();
}

Deletes all values from cache. Be careful of performing this operation if the cache is shared by multiple applications.

getValue() method
protected string getValue(string $key)
$key string a unique key identifying the cached value
{return} string the value stored in cache, false if the value is not in the cache or expired.
Source Code: framework/caching/CZendDataCache.php#45 (show)
protected function getValue($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() method
public void init()
Source Code: framework/caching/CZendDataCache.php#32 (show)
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() method
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
$expire integer the number of seconds in which the cached value will expire. 0 means never expire.
{return} boolean true if the value is successfully stored into cache, false otherwise
Source Code: framework/caching/CZendDataCache.php#60 (show)
protected function setValue($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.