CDirectoryCacheDependency
| 包 | system.caching.dependencies |
|---|---|
| 继承 | class CDirectoryCacheDependency » CCacheDependency » CComponent |
| 实现 | ICacheDependency |
| 可用自 | 1.0 |
| 源码 | framework/caching/dependencies/CDirectoryCacheDependency.php |
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.
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.
公共属性
| 属性 | 类型 | 描述 | 被定义在 |
|---|---|---|---|
| dependentData | mixed | the data used to determine if dependency has been changed. | CCacheDependency |
| 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 |
| reuseDependentData | boolean | Whether this dependency is reusable or not. | CCacheDependency |
公共方法
| 方法 | 描述 | 被定义在 |
|---|---|---|
| __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() | 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
| 方法 | 描述 | 被定义在 |
|---|---|---|
| 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 |
属性详情
directory
属性
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
属性
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
属性
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.
方法详情
__construct()
方法
|
public void __construct(string $directory=NULL)
| ||
| $directory | string | the directory to be checked |
源码： framework/caching/dependencies/CDirectoryCacheDependency.php#55 (显示)
public function __construct($directory=null)
{
$this->directory=$directory;
}
Constructor.
generateDependentData()
方法
|
protected mixed generateDependentData()
| ||
| {return} | mixed | the data needed to determine if dependency has been changed. |
源码： framework/caching/dependencies/CDirectoryCacheDependency.php#66 (显示)
protected function generateDependentData()
{
if($this->directory!==null)
return $this->generateTimestamps($this->directory);
else
throw new CException(Yii::t('yii','CDirectoryCacheDependency.directory cannot be empty.'));
}
Generates the data needed to determine if dependency has been changed. This method returns the modification timestamps for files under the directory.
generateTimestamps()
方法
|
protected array generateTimestamps(string $directory, integer $level=0)
| ||
| $directory | string | the directory name |
| $level | integer | level of the recursion |
| {return} | array | list of file modification time indexed by the file path |
源码： framework/caching/dependencies/CDirectoryCacheDependency.php#82 (显示)
protected function generateTimestamps($directory,$level=0)
{
if(($dir=@opendir($directory))===false)
throw new CException(Yii::t('yii','"{path}" is not a valid directory.',
array('{path}'=>$directory)));
$timestamps=array();
while(($file=readdir($dir))!==false)
{
$path=$directory.DIRECTORY_SEPARATOR.$file;
if($file==='.' || $file==='..')
continue;
if($this->namePattern!==null && !preg_match($this->namePattern,$file))
continue;
if(is_file($path))
{
if($this->validateFile($path))
$timestamps[$path]=filemtime($path);
}
else
{
if(($this->recursiveLevel<0 || $level<$this->recursiveLevel) && $this->validateDirectory($path))
$timestamps=array_merge($timestamps, $this->generateTimestamps($path,$level+1));
}
}
closedir($dir);
return $timestamps;
}
Determines the last modification time for files under the directory. This method may go recursively into subdirectories if recursiveLevel is not 0.
validateDirectory()
方法
|
protected boolean validateDirectory(string $directory)
| ||
| $directory | string | the name of the subdirectory that may be checked for dependency. |
| {return} | boolean | whether this subdirectory should be checked. |
源码： framework/caching/dependencies/CDirectoryCacheDependency.php#131 (显示)
protected function validateDirectory($directory)
{
return true;
}
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()
方法
|
protected boolean validateFile(string $fileName)
| ||
| $fileName | string | the name of the file that may be checked for dependency. |
| {return} | boolean | whether this file should be checked. |
源码： framework/caching/dependencies/CDirectoryCacheDependency.php#118 (显示)
protected function validateFile($fileName)
{
return true;
}
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.