Class yii\caching\DummyCache
| Inheritance | yii\caching\DummyCache » yii\caching\Cache » yii\base\Component » yii\base\Object |
|---|---|
| Implements | ArrayAccess, yii\base\Configurable |
| Available since version | 2.0 |
| Source Code | https://github.com/yiisoft/yii2/blob/master/framework/caching/DummyCache.php |
DummyCache is a placeholder cache component.
DummyCache does not cache anything. It is provided so that one can always configure
a 'cache' application component and save the check of existence of \Yii::$app->cache.
By replacing DummyCache with some other cache component, one can quickly switch from
non-caching mode to caching mode.
For more details and usage information on Cache, see the guide article on caching.
Public Properties
| Property | Type | Description | Defined By |
|---|---|---|---|
| $behaviors | yii\base\Behavior[] | List of behaviors attached to this component | yii\base\Component |
| $defaultDuration | integer | Default duration in seconds before a cache entry will expire. | yii\caching\Cache |
| $keyPrefix | string | A string prefixed to every cache key so that it is unique globally in the whole cache storage. | yii\caching\Cache |
| $serializer | null|array|false | The functions used to serialize and unserialize cached data. | yii\caching\Cache |
Public Methods
| Method | Description | Defined By |
|---|---|---|
| __call() | Calls the named method which is not a class method. | yii\base\Component |
| __clone() | This method is called after the object is created by cloning an existing one. | yii\base\Component |
| __construct() | Constructor. | yii\base\Object |
| __get() | Returns the value of a component property. | yii\base\Component |
| __isset() | Checks if a property is set, i.e. defined and not null. | yii\base\Component |
| __set() | Sets the value of a component property. | yii\base\Component |
| __unset() | Sets a component property to be null. | yii\base\Component |
| add() | Stores a value identified by a key into cache if the cache does not contain this key. | yii\caching\Cache |
| attachBehavior() | Attaches a behavior to this component. | yii\base\Component |
| attachBehaviors() | Attaches a list of behaviors to the component. | yii\base\Component |
| behaviors() | Returns a list of behaviors that this component should behave as. | yii\base\Component |
| buildKey() | Builds a normalized cache key from a given key. | yii\caching\Cache |
| canGetProperty() | Returns a value indicating whether a property can be read. | yii\base\Component |
| canSetProperty() | Returns a value indicating whether a property can be set. | yii\base\Component |
| className() | Returns the fully qualified name of this class. | yii\base\Object |
| delete() | Deletes a value with the specified key from cache | yii\caching\Cache |
| detachBehavior() | Detaches a behavior from the component. | yii\base\Component |
| detachBehaviors() | Detaches all behaviors from the component. | yii\base\Component |
| ensureBehaviors() | Makes sure that the behaviors declared in behaviors() are attached to this component. | yii\base\Component |
| exists() | Checks whether a specified key exists in the cache. | yii\caching\Cache |
| flush() | Deletes all values from cache. | yii\caching\Cache |
| get() | Retrieves a value from cache with a specified key. | yii\caching\Cache |
| getBehavior() | Returns the named behavior object. | yii\base\Component |
| getBehaviors() | Returns all behaviors attached to this component. | yii\base\Component |
| getOrSet() | Method combines both set() and get() methods to retrieve value identified by a $key, or to store the result of $callable execution if there is no cache available for the $key. | yii\caching\Cache |
| hasEventHandlers() | Returns a value indicating whether there is any handler attached to the named event. | yii\base\Component |
| hasMethod() | Returns a value indicating whether a method is defined. | yii\base\Component |
| hasProperty() | Returns a value indicating whether a property is defined for this component. | yii\base\Component |
| init() | Initializes the object. | yii\base\Object |
| madd() | Stores multiple items in cache. Each item contains a value identified by a key. | yii\caching\Cache |
| mget() | Retrieves multiple values from cache with the specified keys. | yii\caching\Cache |
| mset() | Stores multiple items in cache. Each item contains a value identified by a key. | yii\caching\Cache |
| multiAdd() | Stores multiple items in cache. Each item contains a value identified by a key. | yii\caching\Cache |
| multiGet() | Retrieves multiple values from cache with the specified keys. | yii\caching\Cache |
| multiSet() | Stores multiple items in cache. Each item contains a value identified by a key. | yii\caching\Cache |
| off() | Detaches an existing event handler from this component. | yii\base\Component |
| offsetExists() | Returns whether there is a cache entry with a specified key. | yii\caching\Cache |
| offsetGet() | Retrieves the value from cache with a specified key. | yii\caching\Cache |
| offsetSet() | Stores the value identified by a key into cache. | yii\caching\Cache |
| offsetUnset() | Deletes the value with the specified key from cache This method is required by the interface ArrayAccess. | yii\caching\Cache |
| on() | Attaches an event handler to an event. | yii\base\Component |
| set() | Stores a value identified by a key into cache. | yii\caching\Cache |
| trigger() | Triggers an event. | yii\base\Component |
Protected Methods
| Method | Description | Defined By |
|---|---|---|
| addValue() | Stores a value identified by a key into cache if the cache does not contain this key. | yii\caching\DummyCache |
| addValues() | Adds multiple key-value pairs to cache. | yii\caching\Cache |
| deleteValue() | Deletes a value with the specified key from cache This is the implementation of the method declared in the parent class. | yii\caching\DummyCache |
| flushValues() | Deletes all values from cache. | yii\caching\DummyCache |
| getValue() | Retrieves a value from cache with a specified key. | yii\caching\DummyCache |
| getValues() | Retrieves multiple values from cache with the specified keys. | yii\caching\Cache |
| setValue() | Stores a value identified by a key in cache. | yii\caching\DummyCache |
| setValues() | Stores multiple key-value pairs in cache. | yii\caching\Cache |
Method Details
Stores a value identified by a key into cache if the cache does not contain this key.
This is the implementation of the method declared in the parent class.
| protected boolean addValue ( $key, $value, $duration ) | ||
| $key | string | The key identifying the value to be cached |
| $value | mixed | The value to be cached |
| $duration | integer | The number of seconds in which the cached value will expire. 0 means never expire. |
| return | boolean | True if the value is successfully stored into cache, false otherwise |
|---|---|---|
Deletes a value with the specified key from cache This is the implementation of the method declared in the parent class.
| protected boolean deleteValue ( $key ) | ||
| $key | string | The key of the value to be deleted |
| return | boolean | If no error happens during deletion |
|---|---|---|
Deletes all values from cache.
This is the implementation of the method declared in the parent class.
| protected boolean flushValues ( ) | ||
| return | boolean | Whether the flush operation was successful. |
|---|---|---|
Retrieves a value from cache with a specified key.
This is the implementation of the method declared in the parent class.
| protected mixed|false getValue ( $key ) | ||
| $key | string | A unique key identifying the cached value |
| return | mixed|false | The value stored in cache, false if the value is not in the cache or expired. |
|---|---|---|
Stores a value identified by a key in cache.
This is the implementation of the method declared in the parent class.
| protected boolean setValue ( $key, $value, $duration ) | ||
| $key | string | The key identifying the value to be cached |
| $value | mixed | The value to be cached |
| $duration | integer | The number of seconds in which the cached value will expire. 0 means never expire. |
| return | boolean | True if the value is successfully stored into cache, false otherwise |
|---|---|---|