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CCacheDependency

system.caching.dependencies
继承 class CCacheDependency » CComponent
实现 ICacheDependency
子类 CDbCacheDependency, CDirectoryCacheDependency, CExpressionDependency, CFileCacheDependency, CGlobalStateCacheDependency
可用自 1.0
源码 framework/caching/dependencies/CCacheDependency.php
CCacheDependency is the base class for cache dependency classes.

CCacheDependency implements the ICacheDependency interface. Child classes should override its generateDependentData for actual dependency checking.

公共属性

隐藏继承的属性

属性类型描述被定义在
dependentData mixed the data used to determine if dependency has been changed. CCacheDependency
hasChanged boolean whether the dependency has changed. CCacheDependency
reuseDependentData boolean Whether this dependency is reusable or not. CCacheDependency

公共方法

隐藏继承的方法

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
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
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
evaluateDependency() Evaluates the dependency by generating and saving the data related with dependency. CCacheDependency
evaluateExpression() Evaluates a PHP expression or callback under the context of this component. CComponent
getDependentData() Returns the data used to determine if dependency has been changed. This data is available after evaluateDependency is called. CCacheDependency
getEventHandlers() Returns the list of attached event handlers for an event. CComponent
getHasChanged() Returns whether the dependency has changed. CCacheDependency
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
raiseEvent() Raises an event. CComponent
resetReusableData() Resets cached data for reusable dependencies. CCacheDependency

受保护的方法

隐藏继承的方法

方法描述被定义在
generateDependentData() Generates the data needed to determine if dependency has been changed. CCacheDependency

属性详情

dependentData 属性 只读
public mixed getDependentData()

the data used to determine if dependency has been changed. This data is available after evaluateDependency is called.

hasChanged 属性 只读
public boolean getHasChanged()

whether the dependency has changed.

reuseDependentData 属性 (自版本 v1.1.11 可用)
public boolean $reuseDependentData;

Whether this dependency is reusable or not. If set to true, dependent data for this cache dependency will only be generated once per request. You can then use the same cache dependency for multiple separate cache calls on the same page without the overhead of re-evaluating the dependency each time. Defaults to false;

方法详情

evaluateDependency() 方法
public void evaluateDependency()
源码: framework/caching/dependencies/CCacheDependency.php#51 (显示)
public function evaluateDependency()
{
    if (
$this->reuseDependentData)
    {
        
$hash=$this->getHash();
        if(!isset(
self::$_reusableData[$hash]['dependentData']))
            
self::$_reusableData[$hash]['dependentData']=$this->generateDependentData();
        
$this->_data=self::$_reusableData[$hash]['dependentData'];
    }
    else
        
$this->_data=$this->generateDependentData();
}

Evaluates the dependency by generating and saving the data related with dependency. This method is invoked by cache before writing data into it.

generateDependentData() 方法
protected mixed generateDependentData()
{return} mixed the data needed to determine if dependency has been changed.
源码: framework/caching/dependencies/CCacheDependency.php#103 (显示)
protected function generateDependentData()
{
    return 
null;
}

Generates the data needed to determine if dependency has been changed. Derived classes should override this method to generate actual dependent data.

getDependentData() 方法
public mixed getDependentData()
{return} mixed the data used to determine if dependency has been changed. This data is available after evaluateDependency is called.
源码: framework/caching/dependencies/CCacheDependency.php#84 (显示)
public function getDependentData()
{
    return 
$this->_data;
}

getHasChanged() 方法
public boolean getHasChanged()
{return} boolean whether the dependency has changed.
源码: framework/caching/dependencies/CCacheDependency.php#67 (显示)
public function getHasChanged()
{
    if (
$this->reuseDependentData)
    {
        
$hash=$this->getHash();
        if(!isset(
self::$_reusableData[$hash]['dependentData']))
            
self::$_reusableData[$hash]['dependentData']=$this->generateDependentData();
        return 
self::$_reusableData[$hash]['dependentData']!=$this->_data;
    }
    else
        return 
$this->generateDependentData()!=$this->_data;
}

resetReusableData() 方法 (自版本 v1.1.14 可用)
public static void resetReusableData()
源码: framework/caching/dependencies/CCacheDependency.php#93 (显示)
public static function resetReusableData()
{
    
self::$_reusableData=array();
}

Resets cached data for reusable dependencies.