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CCacheDependency

Package system.caching.dependencies
Inheritance class CCacheDependency » CComponent
Implements ICacheDependency
Subclasses CDbCacheDependency, CDirectoryCacheDependency, CExpressionDependency, CFileCacheDependency, CGlobalStateCacheDependency
Since 1.0
Source Code 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.

Public Properties

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PropertyTypeDescriptionDefined By
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

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
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

Protected Methods

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MethodDescriptionDefined By
generateDependentData() Generates the data needed to determine if dependency has been changed. CCacheDependency

Property Details

dependentData property read-only
public mixed getDependentData()

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

hasChanged property read-only
public boolean getHasChanged()

whether the dependency has changed.

reuseDependentData property (available since v1.1.11)
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;

Method Details

evaluateDependency() method
public void evaluateDependency()
Source Code: framework/caching/dependencies/CCacheDependency.php#51 (show)
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() method
protected mixed generateDependentData()
{return} mixed the data needed to determine if dependency has been changed.
Source Code: framework/caching/dependencies/CCacheDependency.php#103 (show)
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() method
public mixed getDependentData()
{return} mixed the data used to determine if dependency has been changed. This data is available after evaluateDependency is called.
Source Code: framework/caching/dependencies/CCacheDependency.php#84 (show)
public function getDependentData()
{
    return 
$this->_data;
}

getHasChanged() method
public boolean getHasChanged()
{return} boolean whether the dependency has changed.
Source Code: framework/caching/dependencies/CCacheDependency.php#67 (show)
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() method (available since v1.1.14)
public static void resetReusableData()
Source Code: framework/caching/dependencies/CCacheDependency.php#93 (show)
public static function resetReusableData()
{
    
self::$_reusableData=array();
}

Resets cached data for reusable dependencies.

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