Abstract Class yii\caching\Dependency
| Inheritance | yii\caching\Dependency » yii\base\Object |
|---|---|
| Implements | yii\base\Configurable |
| Subclasses | yii\caching\ChainedDependency, yii\caching\DbDependency, yii\caching\DbQueryDependency, yii\caching\ExpressionDependency, yii\caching\FileDependency, yii\caching\TagDependency |
| Available since version | 2.0 |
| Source Code | https://github.com/yiisoft/yii2/blob/master/framework/caching/Dependency.php |
Dependency is the base class for cache dependency classes.
Child classes should override its generateDependencyData() for generating the actual dependency data.
For more details and usage information on Cache, see the guide article on caching.
Public Properties
| Property | Type | Description | Defined By |
|---|---|---|---|
| $data | mixed | The dependency data that is saved in cache and later is compared with the latest dependency data. | yii\caching\Dependency |
| $reusable | boolean | Whether this dependency is reusable or not. | yii\caching\Dependency |
Public Methods
| Method | Description | Defined By |
|---|---|---|
| __call() | Calls the named method which is not a class method. | yii\base\Object |
| __construct() | Constructor. | yii\base\Object |
| __get() | Returns the value of an object property. | yii\base\Object |
| __isset() | Checks if a property is set, i.e. defined and not null. | yii\base\Object |
| __set() | Sets value of an object property. | yii\base\Object |
| __unset() | Sets an object property to null. | yii\base\Object |
| canGetProperty() | Returns a value indicating whether a property can be read. | yii\base\Object |
| canSetProperty() | Returns a value indicating whether a property can be set. | yii\base\Object |
| className() | Returns the fully qualified name of this class. | yii\base\Object |
| evaluateDependency() | Evaluates the dependency by generating and saving the data related with dependency. | yii\caching\Dependency |
| getHasChanged() | Returns a value indicating whether the dependency has changed. | yii\caching\Dependency |
| hasMethod() | Returns a value indicating whether a method is defined. | yii\base\Object |
| hasProperty() | Returns a value indicating whether a property is defined. | yii\base\Object |
| init() | Initializes the object. | yii\base\Object |
| isChanged() | Checks whether the dependency is changed | yii\caching\Dependency |
| resetReusableData() | Resets all cached data for reusable dependencies. | yii\caching\Dependency |
Protected Methods
| Method | Description | Defined By |
|---|---|---|
| generateDependencyData() | Generates the data needed to determine if dependency is changed. | yii\caching\Dependency |
| generateReusableHash() | Generates a unique hash that can be used for retrieving reusable dependency data. | yii\caching\Dependency |
Property Details
The dependency data that is saved in cache and later is compared with the latest dependency data.
Whether this dependency is reusable or not. True value means that dependent data for this cache dependency will be generated only once per request. This allows you to use the same cache dependency for multiple separate cache calls while generating the same page without an overhead of re-evaluating dependency data each time. Defaults to false.
Method Details
Evaluates the dependency by generating and saving the data related with dependency.
This method is invoked by cache before writing data into it.
| public void evaluateDependency ( $cache ) | ||
| $cache | yii\caching\Cache | The cache component that is currently evaluating this dependency |
Generates the data needed to determine if dependency is changed.
Derived classes should override this method to generate the actual dependency data.
| protected abstract mixed generateDependencyData ( $cache ) | ||
| $cache | yii\caching\Cache | The cache component that is currently evaluating this dependency |
| return | mixed | The data needed to determine if dependency has been changed. |
|---|---|---|
Generates a unique hash that can be used for retrieving reusable dependency data.
See also $reusable.
| protected string generateReusableHash ( ) | ||
| return | string | A unique hash value for this cache dependency. |
|---|---|---|
Returns a value indicating whether the dependency has changed.
| public void getHasChanged ( $cache ) | ||
| $cache | ||
Checks whether the dependency is changed
| public boolean isChanged ( $cache ) | ||
| $cache | yii\caching\Cache | The cache component that is currently evaluating this dependency |
| return | boolean | Whether the dependency has changed. |
|---|---|---|
Resets all cached data for reusable dependencies.
| public static void resetReusableData ( ) |