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CExpressionDependency

system.caching.dependencies
继承 class CExpressionDependency » CCacheDependency » CComponent
实现 ICacheDependency
可用自 1.0
源码 framework/caching/dependencies/CExpressionDependency.php
CExpressionDependency represents a dependency based on the result of a PHP expression.

CExpressionDependency performs dependency checking based on the result of a PHP expression. The dependency is reported as unchanged if and only if the result is the same as the one evaluated when storing the data to cache.

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
expression string the PHP expression whose result is used to determine the dependency. CExpressionDependency
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
__construct() Constructor. CExpressionDependency
__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. CExpressionDependency

属性详情

expression 属性
public string $expression;

the PHP expression whose result is used to determine the dependency. The expression can also be a valid serializable PHP callback. It will be passed with a parameter which is the dependency object itself.

The PHP expression will be evaluated using evaluateExpression.

A PHP expression can be any PHP code that has a value. To learn more about what an expression is, please refer to the php manual.

方法详情

__construct() 方法
public void __construct(string $expression='true')
$expression string the PHP expression whose result is used to determine the dependency.
源码: framework/caching/dependencies/CExpressionDependency.php#41 (显示)
public function __construct($expression='true')
{
    
$this->expression=$expression;
}

Constructor.

generateDependentData() 方法
protected mixed generateDependentData()
{return} mixed the data needed to determine if dependency has been changed.
源码: framework/caching/dependencies/CExpressionDependency.php#51 (显示)
protected function generateDependentData()
{
    return 
$this->evaluateExpression($this->expression);
}

Generates the data needed to determine if dependency has been changed. This method returns the result of the PHP expression.