Home » Documentation » Class Reference » CDirectoryCacheDependency

CDirectoryCacheDependency

Package	system.caching.dependencies
Inheritance	class CDirectoryCacheDependency » CCacheDependency » CComponent
Implements	ICacheDependency
Since	1.0
Version	$Id: CDirectoryCacheDependency.php 1678 2010-01-07 21:02:00Z qiang.xue $

CDirectoryCacheDependency represents a dependency based on change of a directory.

CDirectoryCacheDependency performs dependency checking based on the modification time of the files contained in the specified directory. The directory being checked is specified via directory.

By default, all files under the specified directory and subdirectories will be checked. If the last modification time of any of them is changed or if different number of files are contained in a directory, the dependency is reported as changed. By specifying recursiveLevel, one can limit the checking to a certain depth of the directory.

Note, dependency checking for a directory is expensive because it involves accessing modification time of multiple files under the directory.

Public Properties

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Property	Type	Description	Defined By
dependentData	mixed	the data used to determine if dependency has been changed.	CCacheDependency
directory	string	the directory whose change is used to determine if the dependency has been changed.	CDirectoryCacheDependency
hasChanged	boolean	whether the dependency has changed.	CCacheDependency
namePattern	string	the regular expression matching valid file/directory names.	CDirectoryCacheDependency
recursiveLevel	integer	the depth of the subdirectories to be recursively checked.	CDirectoryCacheDependency

Public Methods

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Method	Description	Defined By
__call()	Calls the named method which is not a class method.	CComponent
__construct()	Constructor.	CDirectoryCacheDependency
__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()		CCacheDependency
getEventHandlers()	Returns the list of attached event handlers for an event.	CComponent
getHasChanged()		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

Protected Methods

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Method	Description	Defined By
generateDependentData()	Generates the data needed to determine if dependency has been changed.	CDirectoryCacheDependency
generateTimestamps()	Determines the last modification time for files under the directory.	CDirectoryCacheDependency
validateDirectory()	Checks to see if the specified subdirectory should be checked for dependency.	CDirectoryCacheDependency
validateFile()	Checks to see if the file should be checked for dependency.	CDirectoryCacheDependency

Property Details

directory property

public string $directory;

the directory whose change is used to determine if the dependency has been changed. If any of the files under the directory is changed, the dependency is considered as changed.

namePattern property

public string $namePattern;

the regular expression matching valid file/directory names. Only the matching files or directories will be checked for changes. Defaults to null, meaning all files/directories will qualify.

recursiveLevel property

public integer $recursiveLevel;

the depth of the subdirectories to be recursively checked. If the value is less than 0, it means unlimited depth. If the value is 0, it means checking the files directly under the specified directory.

Method Details

__construct() method

public void __construct(string $directory=NULL)
$directory	string	the directory to be checked

Constructor.

generateDependentData() method

protected mixed generateDependentData()
{return}	mixed	the data needed to determine if dependency has been changed.

Generates the data needed to determine if dependency has been changed. This method returns the modification timestamps for files under the directory.

generateTimestamps() method

protected array generateTimestamps(string $directory, int $level=0)
$directory	string	the directory name
$level	int	level of the recursion
{return}	array	list of file modification time indexed by the file path

Determines the last modification time for files under the directory. This method may go recursively into subdirectories if recursiveLevel is not 0.

validateDirectory() method

protected boolean validateDirectory(string $directory)
$directory	string	the name of the subdirectory that may be checked for dependency.
{return}	boolean	whether this subdirectory should be checked.

Checks to see if the specified subdirectory should be checked for dependency. This method is invoked when dependency of the whole directory is being checked. By default, it always returns true, meaning the subdirectory should be checked. You may override this method to check only certain subdirectories.

validateFile() method

protected boolean validateFile(string $fileName)
$fileName	string	the name of the file that may be checked for dependency.
{return}	boolean	whether this file should be checked.

Checks to see if the file should be checked for dependency. This method is invoked when dependency of the whole directory is being checked. By default, it always returns true, meaning the file should be checked. You may override this method to check only certain files.