Class yii\caching\DummyCache
Inheritance | yii\caching\DummyCache » yii\caching\Cache » yii\base\Component » yii\base\BaseObject |
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Implements | yii\base\Configurable, yii\caching\CacheInterface |
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. This property is read-only. | 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 |
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__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\BaseObject |
__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\BaseObject |
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\caching\Cache |
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 |
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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 |
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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. |
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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. |
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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 |
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